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Gotowa bibliografia na temat „Strain Sensing Application”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Strain Sensing Application"

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Liu, Gang, Qi-Ang Wang, Guiyue Jiao, Pengyuan Dang, Guohao Nie, Zichen Liu i Junyu Sun. "Review of Wireless RFID Strain Sensing Technology in Structural Health Monitoring". Sensors 23, nr 15 (3.08.2023): 6925. http://dx.doi.org/10.3390/s23156925.

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Strain-based condition evaluation has garnered as a crucial method for the structural health monitoring (SHM) of large-scale engineering structures. The use of traditional wired strain sensors becomes tedious and time-consuming due to their complex wiring operation, more workload, and instrumentation cost to collect sufficient data for condition state evaluation, especially for large-scale engineering structures. The advent of wireless and passive RFID technologies with high efficiency and inexpensive hardware equipment has brought a new era of next-generation intelligent strain monitoring systems for engineering structures. Thus, this study systematically summarizes the recent research progress of cutting-edge RFID strain sensing technologies. Firstly, this study introduces the importance of structural health monitoring and strain sensing. Then, RFID technology is demonstrated including RFID technology’s basic working principle and system component composition. Further, the design and application of various kinds of RFID strain sensors in SHM are presented including passive RFID strain sensing technology, active RFID strain sensing technology, semi-passive RFID strain sensing technology, Ultra High-frequency RFID strain sensing technology, chipless RFID strain sensing technology, and wireless strain sensing based on multi-sensory RFID system, etc., expounding their advantages, disadvantages, and application status. To the authors’ knowledge, the study initially provides a systematic comprehensive review of a suite of RFID strain sensing technology that has been developed in recent years within the context of structural health monitoring.

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Grossman, Barry G., Li-Tien Huang, Paul J. Cosentino i Wulf von Eckroth. "Three-Dimensional Structural Strain Measurement with the Use of Fiber-Optic Sensors". Transportation Research Record: Journal of the Transportation Research Board 1596, nr 1 (styczeń 1997): 45–50. http://dx.doi.org/10.3141/1596-07.

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Three-dimensional strain sensing inside a structure is not feasible with conventional strain sensing techniques such as electrical strain gauges, which are limited to surface measurements. Three-dimensional strain measurement inside a structure would find uses in a variety of new applications: enhanced understanding and detection of composite failure modes, such as delamination; sensing for adaptive structural control; intelligent vehicle highway systems; and structural health monitoring systems for civil structures. The latter application could involve remotely monitoring structural integrity during and after an earthquake, for example. A fiber-optic strain sensor array (FOSSA) in a planar, patch-like configuration was developed, and accurate measurement of the three principal strains inside a simple structure was demonstrated. The planar configuration was chosen to avoid the difficulty and structural degradation of embedding optical sensors in three planes. Two extrinsic Fabry-Perot interferometric (EFPI) sensors and one polari-metric sensor form the planar sensor array. The two EFPI sensors were placed perpendicular to each other in the sensor plane to extract the two normal strain components along the x and y axes. The polarimetric sensor embedded in the plane was used to extract the third normal strain acting on the z axis. The sensor array was embedded in an epoxy resin cube and loaded to 454 kg (1,000 1b) with a loading machine. The strains that were measured correlated well with the external strains measured with surface-bonded electrical strain gauges. The variation in measured strain between the two sensor systems was less than 4 percent for all three principal axes.

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Fang, Xinqiu, Fan Zhang, Zongshen Shi, Minfu Liang i Yang Song. "Research and Application of Multi-Mode Joint Monitoring System for Shaft Wall Deformation". Sensors 22, nr 17 (30.08.2022): 6551. http://dx.doi.org/10.3390/s22176551.

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The mine shaft is an important channel linking the underground with the surface, undertaking important functions such as personnel and material transportation and ventilation. Thus the shaft, known as the throat of the mine, is the production hub of the whole mine. Since 1980, damage to coal mine shafts has occurred in many areas of China, which has seriously impacted the safety of mine production. Therefore, real-time monitoring of the shaft wall condition is necessary. However, the traditional monitoring method cannot achieve long-term, continuous and stable monitoring of the shaft wall due to the harsh production environment downhole. Hence, a multi-mode joint sensing system for shaft wall deformation and damage is proposed, which is mainly based on FBG sensing and supplemented by vibrating-string sensing. The principle of FBG sensing is that when the external environment such as temperature, pressure and strain changes, the characteristics of light transmission in the FBG such as wavelength, phase and amplitude will also change accordingly. Using the linear relationship between the strain and the wavelength shift of the FBG, the strain of the measured structure is obtained by calculation. Firstly, this paper introduces the basic situations of the mine and analyzes the causes shaft damage. Then the vertical and circumferential theoretical values at different shaft depths are derived in combination with the corresponding force characteristics. Moreover, a four-layer strain transfer structure model of the shaft consisting of the fiber, the protective layer, the bonding layer and the borehole wall is established, which leads to the derivation of the strain transfer relational expression for the surface-mounted FBG sensing on the shaft wall. The strain-sensing transfer law and the factors influencing the strain-sensing transfer of the surface-mounted FBG on the shaft wall are analyzed. The order of key factors influencing the strain-sensing transfer is obtained by numerical simulation: the radius of the protective layer, the length of the FBG paste, and the elastic modulus of the adhesive layer. The packaging parameters with the best strain-sensing transfer of the surface-mounted FBG on the shaft wall are determined. A total of six horizontal level monitoring stations are arranged in a coal mine auxiliary shaft. Through the comprehensive analysis of the sensing data of the two sensors, the results show that the average shaft wall strain–transfer efficiency measured by the FBG sensor reaches 94.02%. The relative average error with the theoretical derivation of shaft wall transfer efficiency (98.6%) is 4.65%, which verifies the strain transfer effect of the surface-mounted FBG applied to the shaft wall. The shaft wall’s deformation monitoring system with FBG sensing as the main and vibrating-string sensing as the supplement is important to realize the early warning of well-wall deformation and further research of the shaft wall rupture mechanism.

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Stoney, Rory, Dermot Geraghty i Garret E. O’Donnell. "Dynamic Response Analysis of Passive Wireless Surface Acoustic Wave (SAW) Strain Sensors Used for Force Measurement in Turning". International Journal of Automation Technology 7, nr 4 (5.07.2013): 451–60. http://dx.doi.org/10.20965/ijat.2013.p0451.

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Passive wireless surface acoustic wave (SAW) strain sensors offer significant advantages over alternative well known sensing technologies and can enable sensing applications robustly in very harsh environments. The passive wireless operation of SAW sensors is especially relevant given there is a drive for more robust and diverse sensing technologies in more complex and high performance applications. Wireless passive dynamic SAW strain sensing has been realised and has enabled force measurement during CNC turning. This paper demonstrates the SAW performance alongside two state of the art Kistler sensing technologies designed for this application area. Direct analysis and investigation of both static and dynamic signals is important for establishing bench-mark performancemetrics and the operational bandwidth of the SAW system.

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Horszczaruk, E., P. Sikora i P. Łukowski. "Application of Nanomaterials in Production of Self-Sensing Concretes: Contemporary Developments and Prospects". Archives of Civil Engineering 62, nr 3 (1.09.2016): 61–74. http://dx.doi.org/10.1515/ace-2015-0083.

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Abstract In the recent years structural health monitoring (SHM) has gathered spectacular attention in civil engineering applications. Application of such composites enable to improve the safety and performance of structures. Recent advances in nanotechnology have led to development of new family of sensors - self-sensing materials. These materials enable to create the so-called “smart concrete” exhibiting self-sensing ability. Application of self-sensing materials in cement-based materials enables to detect their own state of strain or stress reflected as a change in their electrical properties. The variation of strain or stress is associated with the variation in material’s electrical characteristics, such as resistance or impedance. Therefore, it is possible to efficiently detect and localize crack formation and propagation in selected concrete element. This review is devoted to present contemporary developments in application of nanomaterials in self-sensing cement-based composites and future directions in the field of smart structures.

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Chaoui, Fahd, Otman Aghzout, Mounia Chakkour i Mounir El Yakhloufi. "Apodization Optimization of FBG Strain Sensor for Quasi-Distributed Sensing Measurement Applications". Active and Passive Electronic Components 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/6523046.

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A novel optimized apodization of Fiber Bragg Grating Sensor (FBGS) for quasi-distributed strain sensing applications is developed and introduced in this paper. The main objective of the proposed optimization is to obtain a reflectivity level higher than 90% and a side lobe level around −40 dB, which is suitable for use in quasi-distributed strain sensing application. For this purpose, different design parameters as apodization profile, grating length, and refractive index have been investigated to enhance and optimize the FBGS design. The performance of the proposed apodization has then been compared in terms of reflectivity, side lobe level (SLL), and full width at half maximum (FWHM) with apodization profiles proposed by other authors. The optimized sensor is integrated on quasi-distributed sensing system of 8 sensors demonstrating high reliability. Wide strain sensitivity range for each channel has also been achieved in the quasi-distributed system. Results prove the efficiency of the proposed optimization which can be further implemented for any quasi-distributed sensing application.

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Gao, Lei, Zhihao Li, Jie Li, Zhen Wang, Haiming Jiang i Mingyang Wang. "Application of Fiber Grating Sensing in Similar Model Impact Tests of Underground Engineering". Geofluids 2023 (14.04.2023): 1–18. http://dx.doi.org/10.1155/2023/8185870.

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To clarify damage or degradation mechanisms of underground shock disturbance of deep caverns, a customized model of a deep cavern to subjected ground shock was employed to simulate the following properties and processes: crustal stress loading, cavern excavation, and ground-shock disturbance loading. The similar model specimen was a cube of 1.3 m length and a size similarity ratio of 1 : 50. A fiber Bragg grating (FBG) strain sensor with multipoint distributions was developed to monitor the distribution of internal strains in the model. Sensors were appropriately arranged and packaged in the similar model of deep rock to determine strain variation in the model under hydrostatic confining pressure, construction dynamic load, and shock dynamic load. This investigation involved high crustal stress simulation, tunnel boring machine (TBM) construction simulation, and deep explosive shock simulation, respectively. The results suggest that the sensors can accurately monitor the strain during the entire process comprising loading, excavation, and shock generation and obtain the distribution of cave strain during excavation and shock generation. The cave strain indicated that the left and right sides of the tunnel both experienced a rapid increase in tensile strain from the top plane shock wave, proportional to the shock force. The mechanism of surrounding rock failure and the occurrence of the V-shaped blasting pit were clarified. In the model test, the following phenomena related to deep tunnel failure were simulated: particle ejection, block collapse, slabbing, and tunnel face collapse. The oscillatory wave was also monitored with FBG sensors. The results demonstrated that FBG strain sensor had good repeatability and could accurately monitor strain change in the different blocks, thus demonstrating considerable potential for use in similar model tests. The model tests conducted in this study can provide important technical reference and support for the construction and protective design of deep caverns.

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Chen, Chun-Bing, Hsuan-Ling Kao, Li-Chun Chang, Cheng-Lin Cho, Yi-Chen Lin, C. C. Huang, C. C. Mo, Wen-Hung Chung i Hsien-Chin Chiu. "Fabrication of Inkjet-Printed Carbon Nanotube for Enhanced Mechanical and Strain-Sensing Performance". ECS Journal of Solid State Science and Technology 10, nr 12 (1.12.2021): 121001. http://dx.doi.org/10.1149/2162-8777/ac40d4.

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This paper presents fabrication of inkjet-printed carbon nanotube film on flexible substrate for wearable electronics applications. The density of CNT films is optimized by droplet spacing (DS) and multiple passes to provide the best strain behavior. It is found that low-density carbon nanotubes have fewer conductive pathways resulting in less change and low GF under applied strain. Conversely, high-density carbon nanotubes have more conductive paths, and they are not easily broken under strain, resulting in poor strain-sensing ability. The inkjet printing process can adjust uniformity and density of CNT film through DS and multiple passes to optimize its strain characteristics. The highest GF of 3.36 was obtained under strain ranging from 71 to 3128 με when CNT printed by DS of 23 μm and 20 passes. The relative change in resistance under various strains, ranging from 71 to 3128 με, had a stable peak value for each 20 strain/release cycle which proved its repeatability and stability. Furthermore, inkjet-printed CNT sensors monitored human movement of various joints and distinguished bending angle demonstrating its potentially practical application in wearable electronics.

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Yang, Yongqiang, Yongsong Tan, Qun Wang, Yihu Shu, Qinsheng Wang i Yunjie Yin. "Application of AgNPs/rGO Modified Nylon Fabric in Strain Sensing". Journal of Physics: Conference Series 2109, nr 1 (1.11.2021): 012017. http://dx.doi.org/10.1088/1742-6596/2109/1/012017.

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Abstract The graphene oxide slurry was printed on the pre-stretched and non-pre-stretched nylon fabric by screen printing, and immersed in silver ammonia solution of different concentrations, and then reduced to obtain silver nanoparticles/reduced graphene oxide (AgNPs/rGO) modified nylon fabric with excellent conductivity. The surface morphology of the fabric was observed, and the performances of the fabric sensor that was scraped with graphene oxide slurry between the pre-stretched and non-pre-stretched states were explored. The resistance responses of the nylon fabric finished with different concentrations of silver ammonia solution under different strains (1%, 2%, 3%, 4%, 5%, 10%, 15%, 20%) were investigated. The results showed that the nylon strain sensor was more sensitive and stable when the graphene oxide slurry was scraped in the pre-stretched state, and while the silver ammonia solution concentration was 10 mg/mL, the nylon fabric had maximum sensitivity and lowest hysteresis performance.

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Irani, Farid Sayar, Ali Hosseinpour Shafaghi, Melih Can Tasdelen, Tugce Delipinar, Ceyda Elcin Kaya, Guney Guven Yapici i Murat Kaya Yapici. "Graphene as a Piezoresistive Material in Strain Sensing Applications". Micromachines 13, nr 1 (12.01.2022): 119. http://dx.doi.org/10.3390/mi13010119.

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High accuracy measurement of mechanical strain is critical and broadly practiced in several application areas including structural health monitoring, industrial process control, manufacturing, avionics and the automotive industry, to name a few. Strain sensors, otherwise known as strain gauges, are fueled by various nanomaterials, among which graphene has attracted great interest in recent years, due to its unique electro-mechanical characteristics. Graphene shows not only exceptional physical properties but also has remarkable mechanical properties, such as piezoresistivity, which makes it a perfect candidate for strain sensing applications. In the present review, we provide an in-depth overview of the latest studies focusing on graphene and its strain sensing mechanism along with various applications. We start by providing a description of the fundamental properties, synthesis techniques and characterization methods of graphene, and then build forward to the discussion of numerous types of graphene-based strain sensors with side-by-side tabular comparison in terms of figures-of-merit, including strain range and sensitivity, otherwise referred to as the gauge factor. We demonstrate the material synthesis, device fabrication and integration challenges for researchers to achieve both wide strain range and high sensitivity in graphene-based strain sensors. Last of all, several applications of graphene-based strain sensors for different purposes are described. All in all, the evolutionary process of graphene-based strain sensors in recent years, as well as the upcoming challenges and future directions for emerging studies are highlighted.

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Rozprawy doktorskie na temat "Strain Sensing Application"

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Liang, Sijia [Verfasser], Roger [Gutachter] Wördenweber, Markus [Gutachter] Grüninger i Joachim [Gutachter] Hemberger. "Surface Acoustic Waves in Strain-Engineered Thin (K,Na)NbO3 Films: From Basic Research to Application in Molecular Sensing / Sijia Liang ; Gutachter: Roger Wördenweber, Markus Grüninger, Joachim Hemberger". Köln : Universitäts- und Stadtbibliothek Köln, 2021. http://d-nb.info/1229616705/34.

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Harold, Douglas A. "An Evaluation of Optical Fiber Strain Sensing for Engineering Applications". Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/41239.

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A fatigue test has been performed on 7075-T651 aluminum specimens which were bonded with polyimide coated optical fibers with discrete Bragg gratings. These fibers were bonded with AE-10 strain gage adhesive. The results indicate that lower strain amplitudes do not produce cause for concern, but that larger strain amplitudes (on the order of 3500 Î¼) may cause some sensors to become unreliable. The strain response of acrylate coated optical fiber strain sensors bonded to aluminum specimens with AE-10 and M-Bond 200 strain gage adhesives was investigated with both axial and cantilever beam tests. These results were compared to both the strain response of conventional strain gages and to model predictions. The results indicate that only about 82.6% of the strain in the specimen was transferred through the glue line and fiber coating into the fiber. Thus, multiplying by a strain transfer factor of approximately 1.21 was sufficient to correct the optical fiber strain output. This effect was found to be independent of the adhesive used and independent of the three-dimensional profile of the glue line used to attach the fiber. Finally, this effect did not depend on whether the fiber had a polyimide or an acrylate coating. Further investigation was conducted on the feasibility of using optical fiber strain sensors for monitoring subcritical damage (such as matrix cracks) in fiber reinforced composite materials. These results indicate that an array of optical fibers which monitor the strain profile on both sides of a composite panel may be sufficient for these purposes
Master of Science

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White, Julia. "OPTIC FIBER SENSOR FOR STRAIN MEASUREMENTS IN HIGH TEMPERATURE SENSING APPLICATIONS". International Foundation for Telemetering, 2017. http://hdl.handle.net/10150/626969.

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Optic fiber sensors are employed in a variety of applications for the remote measurement of various parameters such as strain, pressure, or temperature. These sensors offer an array of benefits as well including light weight, compactness, and high resolution. In particular, Fabry-Perot interferometers (FPIs) maintain these benefits and can also be made to withstand extremely high temperatures. This advantage of the FPI allows it to be used in harsh environments where many other tools for parameter measurement could not survive. An FPI strain sensor is constructed and tested which has the capabilities to be used at high temperatures of over 1000°C for applications in gas turbine engine testing. This paper discusses the need for high temperature strain sensors in engine testing and this sensor’s capabilities in this application.

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Nguyen, Quan H. "Physical Sensing Effects in AlGaN/GaN Heterostructure and Applications". Thesis, Griffith University, 2021. http://hdl.handle.net/10072/411259.

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Gallium nitride (GaN) is a promising material for electronic sensing devices operating in harsh environments, thanks to its large energy band gap, superior mechanical properties and excellent chemical inertness. Among various wide energy band gap semiconductors such as 3C-SiC, 4H-SiC, 6H-SiC materials, GaN and its compounds are considered as the most suitable materials for Micro Electro-Mechanical Systems (MEMS) sensors for harsh environment applications, as it can be grown on both sapphire and Si substrates, which are compatible with conventional MEMS fabrication processes, while reducing the cost of GaN wafers. GaN-based electronic devices for high frequency and high power applications have been already commercially available. However, their application in sensing is still underdeveloped and under-commercialized. This research aims to experimentally investigate and theoretically analyze the physical sensing effects, such as piezotronic, Hall, pseudo-Hall, and phototronic effects on Al-GaN/GaN heterojunctions, and explores the potential of enhancing the sensitivity of AlGaN/GaN-based sensing devices through multi-physics coupling effect. The first purpose of this study is to examine the effect of external strain on the polarization and electronic properties of the p-GaN/AlGaN/GaN heterostructure (piezotronic effect) and evaluates the possibility to utilize the effect as a strain sensing mechanism. Theoretical analysis on the strain induced effect in the energy band structure is thoroughly conducted. p-GaN/AlGaN/GaN based sensing devices are fabricated and characterized, which exhibit high sensitivity, excellent linearity, and good repeatability, indicating the potential for pressure/strain sensing. In addition, the possibility of enhancing the sensitivity of an p-GaN/AlGaN/GaN heterostructure based piezotronic sensor by employing the photoexcitation-electronic coupling effect is also investigated. The research analyses the key parameters contributing to this tuneable giant piezotronic effect and figures out the physical mechanism leading to this phenomenon. The next goal is to characterize the performance of the AlGaN/GaN-based current sensor and AlGaN/GaN van der Pauw strain sensor utilizing Hall and pseudo-Hall effects, respectively. Both current sensor and van der Pauw sensor exhibit high sensitivity, excellent repeatability and linearity, while the current sensor operates at a temperature range from room to 200 degrees C with negligible changes in sensitivity. Combining these performances with the excellent mechanical strength, electrical conductivity, and chemical inertness of GaN, the proposed sensors are promising for strain and power monitoring in harsh environments. Furthermore, this research also intends to investigate the phototronic behaviors of the AlGaN/GaN heterojunction under UV illuminations (phototronic e ect). The characteristics of the heterojunction are also evaluated under broad spectral illuminations to prove its potential for high-performance visible-blind UV light detector. Moreover, the in-depth discussion about the carrier generation and transport mechanisms will provide vital information for the development of AlGaN/GaN optoelectronic sensing devices. This thesis is prepared in a \thesis by publications" format. The published and submitted journal articles are the main contents of chapters 3, 4, 5, and 6.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Eng & Built Env
Science, Environment, Engineering and Technology
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Njuguna, Michael Kamau. "Characterisation of multi wall carbon nanotube–polymer composites for strain sensing applications". Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/54671/1/Michael_Kamau_Njuguna_Thesis.pdf.

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Carbon nanotubes (CNTs) have excellent electrical, mechanical and electromechanical properties. When CNTs are incorporated into polymers, electrically conductive composites with high electrical conductivity at very low CNT content (often below 1% wt CNT) result. Due to the change in electrical properties under mechanical load, carbon nanotube/polymer composites have attracted significant research interest especially due to their potential for application in in-situ monitoring of stress distribution and active control of strain sensing in composite structures or as strain sensors. To sucessfully develop novel devices for such applications, some of the major challenges that need to be overcome include; in-depth understanding of structure-electrical conductivity relationships, response of the composites under changing environmental conditions and piezoresistivity of different types of carbon nanotube/polymer sensing devices. In this thesis, direct current (DC) and alternating current (AC) conductivity of CNT-epoxy composites was investigated. Details of microstructure obtained by scanning electron microscopy were used to link observed electrical properties with structure using equivalent circuit modeling. The role of polymer coatings on macro and micro level electrical conductivity was investigated using atomic force microscopy. Thermal analysis and Raman spectroscopy were used to evaluate the heat flow and deformation of carbon nanotubes embedded in the epoxy, respectively, and related to temperature induced resistivity changes. A comparative assessment of piezoresistivity was conducted using randomly mixed carbon nanotube/epoxy composites, and new concept epoxy- and polyurethane-coated carbon nanotube films. The results indicate that equivalent circuit modelling is a reliable technique for estimating values of the resistance and capacitive components in linear, low aspect ratio-epoxy composites. Using this approach, the dominant role of tunneling resistance in determining the electrical conductivity was confirmed, a result further verified using conductive-atomic force microscopy analysis. Randomly mixed CNT-epoxy composites were found to be highly sensitive to mechanical strain and temperature variation compared to polymer-coated CNT films. In the vicinity of the glass transition temperature, the CNT-epoxy composites exhibited pronounced resistivity peaks. Thermal and Raman spectroscopy analyses indicated that this phenomenon can be attributed to physical aging of the epoxy matrix phase and structural rearrangement of the conductive network induced by matrix expansion. The resistivity of polymercoated CNT composites was mainly dominated by the intrinsic resistivity of CNTs and the CNT junctions, and their linear, weakly temperature sensitive response can be described by a modified Luttinger liquid model. Piezoresistivity of the polymer coated sensors was dominated by break up of the conducting carbon nanotube network and the consequent degradation of nanotube-nanotube contacts while that of the randomly mixed CNT-epoxy composites was determined by tunnelling resistance between neighbouring CNTs. This thesis has demonstrated that it is possible to use microstructure information to develop equivalent circuit models that are capable of representing the electrical conductivity of CNT/epoxy composites accurately. New designs of carbon nanotube based sensing devices, utilising carbon nanotube films as the key functional element, can be used to overcome the high temperature sensitivity of randomly mixed CNT/polymer composites without compromising on desired high strain sensitivity. This concept can be extended to develop large area intelligent CNT based coatings and targeted weak-point specific strain sensors for use in structural health monitoring.

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Bhatia, Vikram. "Properties and sensing applications of long-period gratings". Diss., This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-11082006-133634/.

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Ke, Kai. "Piezoresistive Behavior of Carbon Nanotube based Poly(vinylidene fluoride) Nanocomposites towards Strain Sensing Applications". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-201959.

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With the development of modern industrial engineering technology, increasing demands of multifunctional materials drive the exploration of new applications of electrical conductive polymer nanocomposites (CPNCs). Toward applications of smart materials, sensing performance of CPNCs has gained immense attention in the last decade. Among them, strain sensors, based on piezoresistive behavior of CPNCs, are of high potential to carry out structural health monitoring (SHM) tasks. Poly(vinylidene fluoride) (PVDF) is highly thought to be potential for SHM applications in civil infrastructures like bridges and railway systems, mechanical systems, automobiles, windgenetors and airplanes, etc. because of its combination of flexibility, low weight, low thermal conductivity, high chemical corrosion resistance, and heat resistance, etc. This work aimed to achieve high piezoresistive sensitivity and wide measurable strain ranges in carbon nanotube based poly(vinylidene fluoride) (PVDF) nanocomposites. Four strategies were introduced to tune the sensitivity of the relative electrical resistance change (ΔR/R0) versus the applied tensile strain for such nanocomposites. Issues like the influence of dispersion of multi-walled carbon nanotubes (MWCNTs) on initial resistivity of PVDF nanocomposites and conductive network structure of MWCNTs, as well as piezoresistive properties of the nanocomposites, were addressed when using differently functionalized MWCNTs (strategy 1). In addition, the effects of crystalline phases of PVDF, mechanical ductility of its nanocomposites and interfacial interactions between PVDF and fillers on piezoresistive properties of PVDF nanocomposites were studied. Using hybrid fillers, to combine MWCNTs with conductive carbon black (strategy 2) or isolating organoclay (strategy 3), piezoresistive sensitivity and sensing strain ranges of PVDF nanocomposites could be tuned. Besides, both higher sensitivity and larger measurable strain ranges are achieved simultaneously in PVDF/MWCNT nanocomposites when using the ionic liquid (IL) BMIM+PF6- as interface linker/modifier (strategy 4). The detailed results and highlights are summarized as following: 1. The surface functionalization of MWCNTs influences their dispersion in the PVDF matrix, the PVDF-nanotube interactions and crystalline phases of PVDF, which finally results in different ΔR/R0 and the strain at the yield point (possibly the upper limit of sensing strain ranges). As a whole, regarding to the fabrication of strain sensors based on PVDF/MWCNT nanocomposite, in contrast to pristine CNTs, CNTs-COOH and CNTs-OH, CNT-NH2 filled PVDF nanocomposites possess not only high piezoresistive sensitivity but also wide measurable strain ranges. Gauge factor, i.e. GF, is ca.14 at 10% strain (strain at the yield point) for the nanocomposites containing 0.75% CNTs-NH2. 2. Using hybrid fillers of CNTs and CB to construct strain-susceptible network structure (conductive pathway consisting of string-like array of CNTs and CB particles) enhances the piezoresistive sensitivity of PVDF nanocomposites, which is tightly associated with the CNT content in hybrid fillers and mCNTs/mCB. The best piezoresistive effect is achieved in PVDF nanocomposites with fixed CNT content lower than the ΦC (0.53 wt. %) of PVDF/CNT nanocomposites. 3. ΔR/R0 and possible sensing strain ranges of PVDF nanocomposites were tailored by changing crystalline phases of PVDF and PVDF-MWCNT interactions. Besides, the increase of the strain at yield point in PVDF nanocomposites filled by CNTs-OH is more obvious than that in the nanocomposites containing the same amount of clay and CNTs. The nanocomposite consisting of 0.25% clay and 0.75% CNTs-OH have ca. 70% increase of the strain at the yield point (17%) and the GF at this strain is ca. 14, while GF for the nanocomposite filled by only 0.75% CNTs-OH is ca. 5 at 10% strain. 4. IL BMIM+PF6- served as interface linker for PVDF and MWCNTs, which significantly increased the values of ΔR/R0 and strain at the yield point of PVDF nanocomposites simultaneously. Besides, this increases with increasing IL content. With the aid of IL, the dispersion of nanotube and toughness of the nanocomposites are greatly improved, but the electrical conductivity of the nanocomposites is decreased with the incorporation of IL, which is related to the IL modified PVDF-MWCNT interface connection or bonding. GF reaches ca. 60 at 21% strain (the strain at the yield point) for PVDF nanocomposites filled by 10% IL premixed 2%CNTs-COOH.

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Naeli, Kianoush. "Optimization of piezoresistive cantilevers for static and dynamic sensing applications". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28247.

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Thesis (M. S.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Brand, Oliver; Committee Member: Adibi, Ali; Committee Member: Allen, Mark G.; Committee Member: Bottomley, Lawrence A.; Committee Member: Degertekin, F. Levent.

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Melilli, Giuseppe. "Irradiation and nanostructuration of piezoelectric polymers for nano-sensoring and harvesting energy applications". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLX072/document.

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La polyvalence de la technique de track-etching a permis d’étudier plus avant l’effet piezoélectrique direct et indirect d’un film polarisé en poly(fluorure de vinylidène) PVDF en créant des membranes nanostructurées hybrides de nanofils de nickel (Ni NWs)/PVDF. Les propriétés magnétiques du nanofil de nickel, telle que la magnétorésistance anisotrope (AMR), ont été exploitées afin d’étudier la réponse de l’aimantation à la déformation mécanique de la matrice PVDF. En particulier, les déformations ont été induites soit par contrainte thermo-mécanique, soit par contrainte électromécanique (effet piezoélectrique indirect). La sensibilité d’un nanofil unique a permis de déterminer l’amplitude et la direction de la contrainte mécanique exercée à l’échelle nanométrique par la matrice PVDF. La résistance exceptionnelle de la réponse piezoélectrique directe du film PVDF polarisé à l’irradiation, telle que l’irradiation aux ions-lourds accélérés et aux électrons (domaine de doses < 100kGy) a été observée. Mis à part la conservation de la réponse piezoélectrique, les défauts engendrés par l’irradiation dans ce domaine de dose (scissions de chaines, augmentation de phase crystalline, réticulations) ont eu un impact significatif sur la structure du matériau polymère. L’ensemble de ces défauts, les uns prépondérants en-dessous de la dose-gel ( 10kGy), les autres au-dessus, forme une compensation d’effets antagonistes qui mènent à une réponse piezoélectrique globalement inchangée. Stimulé par la grande résistance du PVDF à l’irradiation en termes de réponse piezoélectrique, l’idée a été d’exploiter, en vue d’une application dans la récupération d’énergie, le réseau de nanofils de nickel inclus dans la membrane en PVDF polarisé pour étudier l’influence des nanofils de nickel sur la l’efficacité piezoélectrique. La présence du réseau de nanofils de nickel mène à un accroissement non négligeable de l’efficacité piezoélectrique. Reliée à la présence des nanofils, une augmentation de la permittivité diélectrique dans le PVDF nanostructuré a également été enregistrée. Une polarisation interfaciale entre les nanofils de nickel et la matrice PVDF pourrait expliquer cette valeur accrue par rapport au PVDF nanoporeux sans nanofils
The versatility of the track-etching technique has allowed to investigate deeper the direct and inverse piezoelectric effect of a polarized Poly(vinylidene fluoride) (PVDF) film in building nanostructured hybrid Nickel nanowires (Ni NWs)/PVDF membrane. The magnetic properties of the Ni NW, such as anisotropic magneto resistance (AMR), are exploited to investigate the response of the magnetization to a mechanical deformation of the PVDF matrix. In particular, the deformations were induced either by thermo-mechanical or an electro-mechanical (inverse piezoelectric effect) stress. The sensitivity of the single NW has allowed to determine the amplitude and direction of a mechanical stress exerted at the nano-scale by the PVDF matrix. The outstanding resistance of the direct piezoelectric response of polarized PVDF film to radiation, such as SHI and e-beam, (doses range < 100kGy) was reported. Beyond the conservation of the piezoelectric response, in this dose range, irradiation defects (chain scissions, increase of the crystalline -phase, crosslinking) had a significative impact on the polymer material. All these defects, ones predominant above the gel dose (herein 10 kGy), and the other ones below, compensate their antagonistic effects towards the globally unchanged piezoelectric responses. Motivated by the high radiation resistance of the PVDF in terms of piezoelectric response, the idea was to exploit Ni NWs array embedded in the polarized PVDF membrane to study the influence of the Ni NWs on the piezoelectric response in view of harvesting energy application. The presence of the Ni NWs array leads a non-negligible increase of the piezoelectric efficiency. Related to the presence of the NWs, an increase of the dielectric permittivity in the nanostructured PVDF was also reported. An interfacial polarization between the Ni NWs and the PVDF matrix could explain the higher efficiency value respect to nanoporous PVDF, without NWs

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Ke, Kai [Verfasser], Brigitte [Akademischer Betreuer] Voit i Karl [Akademischer Betreuer] Schulte. "Piezoresistive Behavior of Carbon Nanotube based Poly(vinylidene fluoride) Nanocomposites towards Strain Sensing Applications / Kai Ke. Betreuer: Brigitte Voit. Gutachter: Brigitte Voit ; Karl Schulte". Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://d-nb.info/1100356053/34.

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Książki na temat "Strain Sensing Application"

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Zhu, Ren, i Rusen Yang. Synthesis and Characterization of Piezotronic Materials for Application in Strain/Stress Sensing. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70038-0.

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Turner, Roderick David. Dual wavelength fiber-optic polarimeter for path-integrated strain sensing: application to the measurement of local slope on a flexible beam. [Downsview, Ontario]: University of Toronto, Institute for Aerospace Studies, 1991.

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Turner, Roderick David. Dual wavelength fiber-optic polarimeter for path-integrated strain sensing: application to the measurement of local slope on a flexible beam. [Downsview, Ont.]: University of Toronto, Institute for Aerospace Studies, 1990.

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United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., red. Strain sensing technology for high temperature applications. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1993.

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Zhu, Ren, i Rusen Yang. Synthesis and Characterization of Piezotronic Materials for Application in Strain/Stress Sensing. Springer, 2019.

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Zhu, Ren, i Rusen Yang. Synthesis and Characterization of Piezotronic Materials for Application in Strain/Stress Sensing. Springer, 2018.

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Turner, Roderick David. Dual wavelength fibre-optic polarimeter for path-integrated strain sensing: application to the measurement of local slope on a flexible beam. 1990.

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Części książek na temat "Strain Sensing Application"

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Ben-Simon, U., S. Shoham, R. Davidi, N. Goldstein, I. Kressel i M. Tur. "Application of Optical Fiber-Based Strain Sensing for the Full-Scale Static and Fatigue Tests of Aircraft Structure". W ICAF 2019 – Structural Integrity in the Age of Additive Manufacturing, 847–52. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-21503-3_67.

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Wilson, Daniel L. "Sensing Change: Measuring Cookstove Adoption with Internet-of-Things Sensors". W Introduction to Development Engineering, 399–427. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-86065-3_15.

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AbstractBy 2012, the civil war in Darfur, Sudan, had been ongoing for 9 years. The war had displaced missions of people and concentrated them into camps for internally-displaced people. This put immense strain on the local availability of woody biomass used for cooking. Women are primarily responsible for collecting fuelwood, and it was estimated that a 7-hour round trip was necessary to collect sufficient firewood for 2 or 3 days, causing great physical hardship to the women and exposing them to extreme risk of sexual violence as they ventured outside the safety of the camps. The Berkeley-Darfur Stove had been demonstrated to reduce fuel use by roughly 50%. However, recall error and social-desirability bias makes evaluating stove use through surveys challenging. This case study chronicles the integration of low-cost temperature sensors into the Berkeley-Darfur Stove to measure actual use (in contrast to self-reported use), as well as the challenges associated with conducting fieldwork and processing large datasets. Based on this work, it was determined that at least 75% of the women who received the Berkeley-Darfur Stove for free actually adopted it for routine use. Additionally, it was (serendipitously) found that just the act of conducting follow-up surveys had a significant positive impact on adoption. In-person surveys were also conducted, and no correlation was found between the stated use frequency of the cookstoves and the measured use frequency (as determined by the sensors), likely due to the social-desirability bias. This work has launched a variety of ventures including the development of data processing software, improved sensor design, and—most recently—the founding of Geocene, a company focused on expanding the application of remote sensors and providing consulting for companies building Internet of Things (IoT) products.

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Reinsch, Thomas, Philippe Jousset i Charlotte M. Krawczyk. "Fiber Optic Distributed Strain Sensing for Seismic Applications". W Encyclopedia of Solid Earth Geophysics, 1–5. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-10475-7_284-1.

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Reinsch, Thomas, Philippe Jousset i Charlotte M. Krawczyk. "Fiber Optic Distributed Strain Sensing for Seismic Applications". W Encyclopedia of Solid Earth Geophysics, 379–83. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-58631-7_284.

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Wanser, Keith H., Michael Haselhuhn i Michael Lafond. "High Temperature Distributed Strain and Temperature Sensing Using OTDR". W Applications of Fiber Optic Sensors in Engineering Mechanics, 194–209. New York, NY: American Society of Civil Engineers, 1993. http://dx.doi.org/10.1061/9780872628953.ch13.

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Tao, Yi-Dan, i Guo-Ying Gu. "Design of a Soft Pneumatic Actuator Finger with Self-strain Sensing". W Intelligent Robotics and Applications, 140–50. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-65289-4_14.

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Zhang, Q., C. Zheng, K. Sagoe-Crentsil i W. Duan. "Transfer and Substrate Effects on 2D Materials for Their Sensing and Energy Applications in Civil Engineering". W Lecture Notes in Civil Engineering, 409–19. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3330-3_42.

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AbstractThe recent emergence of two-dimensional (2D) materials such as graphene and transition metal dichalcogenides (TMDs) of the family (Mo, W)(S, Se)2 has attracted interest from a broad range of engineering applications, including advanced sensing and energy harvesting and conservation, because of their distinctive properties. However, it is critical important to achieve intact delamination and transfer of these atomically thin materials, as well as to understand the effects of the target substrates on their optical and electronic properties. Therefore, we developed and compared techniques for transferring as-grown WS2 crystals to arbitrary substrates. Polystyrene-assisted wet transfer can realize improved preservation of monolayer WS2 crystals than the commonly used poly(methyl methacrylate) (PMMA)-assisted wet transfer method, due to minimal chemical etching involved in the 2D material delamination process. The intercalation of alkali ions in the PMMA-based transfer method induces chemical doping over the transferred 2D crystals, leading to the formation of trions. Moreover, the edges of the crystals on hydrophilic substrates, such as sapphire or SiO2/Si, are subject to ambient water intercalation, which locally affects the photoluminescence behavior of the monolayer WS2 by doping and changing of the dielectric environment. This non-uniform optical behavior is absent when the crystal is transferred onto a hydrophobic substrate through which ambient water cannot penetrate. These results have important implications for the choice of target substrate and transfer method adopted for 2D TMD-based applications such as next-generation strain sensing, photodetectors, gas sensing, bio sensing, solar energy harvesting and radiative cooling in which uniform behavior of the channel material is required.

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More, Swapnil, i Akshay Naik. "Fabrication of 2D NEMS on Flexible Substrates for Strain Engineering in Sensing Applications". W Springer Proceedings in Physics, 45–48. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-97604-4_8.

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Nöther, Nils, i Massimo Facchini. "Distributed Fiber-Optic Strain Sensing: Field Applications in Pile Foundations and Concrete Beams". W Lecture Notes in Civil Engineering, 167–75. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-74258-4_11.

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Lee, S. C., M. F. Chong, B. P. Tee i Mohamad Hisham. "Field applications of fiber optic strain sensing systems in geotechnical and structural engineering". W Smart Geotechnics for Smart Societies, 1395–98. London: CRC Press, 2023. http://dx.doi.org/10.1201/9781003299127-205.

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Streszczenia konferencji na temat "Strain Sensing Application"

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Hew, Ya Yu. "Wireless Strain Sensing for Spacecraft Application". W 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2013. http://dx.doi.org/10.2514/6.2013-124.

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Al-Rubaiai, Mohammed, Ryohei Tsuruta, Umesh Gandhi, Chuan Wang i Xiaobo Tan. "3D-Printed Stretchable Strain Sensor With Application to Wind Sensing". W ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/smasis2018-7945.

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Stretchable strain sensors with large strain range, high sensitivity, and excellent reliability are of great interest for applications in soft robotics, wearable devices, and structure-monitoring systems. Unlike conventional template lithography-based approaches, 3D-printing can be used to fabricate complex devices in a simple and cost-effective manner. In this paper, we report 3D-printed stretchable strain sensors that embeds a flexible conductive composite material in a hyper-plastic substrate. Three commercially available conductive filaments are explored, among which the conductive thermoplastic polyurethane (ETPU) shows the highest sensitivity (gauge factor of 5), with a working strain range of 0%–20%. The ETPU strain sensor exhibits an interesting behavior where the conductivity increases with the strain. In addition, an experiment for measuring the wind speed is conducted inside a wind tunnel, where the ETPU sensor shows sensitivity to the wind speed beyond 5.6 m/s.

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Menendez, Jose M., i J. Alfredo Guemes. "Bragg-grating-based multiaxial strain sensing: its application to residual strain measurement in composite laminates". W SPIE's 7th Annual International Symposium on Smart Structures and Materials, redaktorzy Richard O. Claus i William B. Spillman, Jr. SPIE, 2000. http://dx.doi.org/10.1117/12.388115.

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Brown, Anthony W., Michael D. DeMerchant, Xiaoyi Bao i Robert E. Steffen. "Strain monitoring of the Rollinsford bridge using distributed sensing". W 2000 International Conference on Application of Photonic Technology (ICAPT 2000), redaktorzy Roger A. Lessard i George A. Lampropoulos. SPIE, 2000. http://dx.doi.org/10.1117/12.406360.

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Sharma, Anup, L. Phillips, Sherrie J. Burgett, Paul B. Ruffin i W. Long. "Strain sensing in fiber optic coils with buried Bragg gratings". W 2000 International Conference on Application of Photonic Technology (ICAPT 2000), redaktorzy Roger A. Lessard i George A. Lampropoulos. SPIE, 2000. http://dx.doi.org/10.1117/12.406361.

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Bouhamed, Ayda, Abderrahmane Benchirouf, Abdulkadir Sanli, Christian Muller i Olfa Kanoun. "Piezoresistive behavior of Epoxy/MWCNTs nanocomposites thin films for strain sensing application". W 2015 12th International Multi-Conference on Systems, Signals & Devices (SSD). IEEE, 2015. http://dx.doi.org/10.1109/ssd.2015.7348241.

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Qiu, Huacheng, Yanguang Yang, Fu Min, Wei Xue, Zengling Ran, Zhiqiang Liu i Zhendong Xie. "Hydrodynamic measurements in water tunnel using enhanced-sensitivity all-fiber Fabry-Perot strain gauges". W Optical Sensing and Imaging Technology and Application, redaktorzy Dong Liu, Haimei Gong, Mircea Guina i Jin Lu. SPIE, 2018. http://dx.doi.org/10.1117/12.2504339.

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Smith, Frank J., i Faeze Ghofrani. "Smart Switch: The Application of Fiber Optic Continuous Strain Sensing to the Railroad Turnouts". W 2022 Joint Rail Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/jrc2022-80438.

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Abstract This paper discusses the application of Fiber Optic-based Continuous Strain Sensing (FOCSS) to Switches (a.k.a. railroad turnouts) and presents the resulting benefits. The FOCSS technology allows effective rail break detection to all parts of the switch and reliable point position detection in a secure environment.

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Kadota, M., K. Yamada, H. Kobayashi i S. Tanaka. "Development of acoustic optics tunable filter and its application to strain sensing system". W 2009 18th IEEE International Symposium on the Applications of Ferroelectrics (ISAF). IEEE, 2009. http://dx.doi.org/10.1109/isaf.2009.5307562.

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Yang, Xiaokai, Meng Li, Dong Wei i Xiaoli Kou. "Application of Large Strain Fiber Grating Sensing Technology in Aircraft Structural Health Monitoring". W 2020 IEEE International Conference on Information Technology,Big Data and Artificial Intelligence (ICIBA). IEEE, 2020. http://dx.doi.org/10.1109/iciba50161.2020.9277124.

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Raporty organizacyjne na temat "Strain Sensing Application"

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Barsoum, Michel W. Kinking Nonlinear Elastic Solids for Load Bearing Damping and Strain Sensing Applications. Fort Belvoir, VA: Defense Technical Information Center, luty 2011. http://dx.doi.org/10.21236/ada545946.

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