Journal articles: 'Optical Molecular Sensors'

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Ren, Danyang, Yizhe Sun, Junhui Shi, and Ruimin Chen. "A Review of Transparent Sensors for Photoacoustic Imaging Applications." Photonics 8, no. 8 (August 10, 2021): 324. http://dx.doi.org/10.3390/photonics8080324.

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Photoacoustic imaging is a new type of noninvasive, nonradiation imaging modality that combines the deep penetration of ultrasonic imaging and high specificity of optical imaging. Photoacoustic imaging systems employing conventional ultrasonic sensors impose certain constraints such as obstructions in the optical path, bulky sensor size, complex system configurations, difficult optical and acoustic alignment, and degradation of signal-to-noise ratio. To overcome these drawbacks, an ultrasonic sensor in the optically transparent form has been introduced, as it enables direct delivery of excitation light through the sensors. In recent years, various types of optically transparent ultrasonic sensors have been developed for photoacoustic imaging applications, including optics-based ultrasonic sensors, piezoelectric-based ultrasonic sensors, and microelectromechanical system-based capacitive micromachined ultrasonic transducers. In this paper, the authors review representative transparent sensors for photoacoustic imaging applications. In addition, the potential challenges and future directions of the development of transparent sensors are discussed.

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Siebler, Daniel, Christoph Förster, and Katja Heinze. "Molecular Multi-Wavelength Optical Anion Sensors." European Journal of Inorganic Chemistry 2010, no. 4 (February 2010): 523–27. http://dx.doi.org/10.1002/ejic.200901051.

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Khryapov, Vladimir T. "Optical sensors." Optical Engineering 31, no. 4 (1992): 678. http://dx.doi.org/10.1117/12.56113.

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Jones, Thomas P., and Marc D. Porter. "An Optical Sensor Based on Infrared Spectroscopy." Applied Spectroscopy 43, no. 6 (August 1989): 908–11. http://dx.doi.org/10.1366/0003702894203822.

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A thin-film pH sensor based on vibrational spectroscopy has been developed. The sensor was constructed by the immobilization of Congo Red at a base-hydrolyzed cellulose acetate film that had been coated onto a ZnSe internal reflection element. The protonation of the azo groups of Congo Red was monitored as a function of pH with infrared internal reflection spectroscopy. The response characteristics of this sensor demonstrate the potential utility of applying infrared spectroscopy to detect the response of thin film sensors. Opportunities to design sensors based on the molecular specificity of infrared spectroscopy are briefly discussed.

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Hulea, Mircea, Zabih Ghassemlooy, Sujan Rajbhandari, Othman Isam Younus, and Alexandru Barleanu. "Optical Axons for Electro-Optical Neural Networks." Sensors 20, no. 21 (October 27, 2020): 6119. http://dx.doi.org/10.3390/s20216119.

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Recently, neuromorphic sensors, which convert analogue signals to spiking frequencies, have been reported for neurorobotics. In bio-inspired systems these sensors are connected to the main neural unit to perform post-processing of the sensor data. The performance of spiking neural networks has been improved using optical synapses, which offer parallel communications between the distanced neural areas but are sensitive to the intensity variations of the optical signal. For systems with several neuromorphic sensors, which are connected optically to the main unit, the use of optical synapses is not an advantage. To address this, in this paper we propose and experimentally verify optical axons with synapses activated optically using digital signals. The synaptic weights are encoded by the energy of the stimuli, which are then optically transmitted independently. We show that the optical intensity fluctuations and link’s misalignment result in delay in activation of the synapses. For the proposed optical axon, we have demonstrated line of sight transmission over a maximum link length of 190 cm with a delay of 8 μs. Furthermore, we show the axon delay as a function of the illuminance using a fitted model for which the root mean square error (RMS) similarity is 0.95.

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Pettiwala, Aafrin M., and Prabhat K. Singh. "Optical Sensors for Detection of Amino Acids." Current Medicinal Chemistry 25, no. 19 (May 30, 2018): 2272–90. http://dx.doi.org/10.2174/0929867324666171106161410.

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Background: Amino acids are crucially involved in a myriad of biological processes. Any aberrant changes in physiological level of amino acids often manifest in common metabolic disorders, serious neurological conditions and cardiovascular diseases. Thus, devising methods for detection of trace amounts of amino acids becomes highly elemental to their efficient clinical diagnosis. Recently, the domain of developing optical sensors for detection of amino acids has witnessed significant activity which is the focus of the current review article. Methods: We undertook a detailed search of the peer-reviewed literature that primarily deals with optical sensors for amino acids and focuses on the use of different type of materials as a sensing platform. Results: Ninety-five papers have been included in the review, majority of which deal with optical sensors. We attempt to systematically classify these contributions based on the applications of various chemical and biological scaffolds such as polymers, supramolecular assemblies, nanoparticles, DNA, heparin etc for the sensing of amino acids. This review identifies that supramolecular assemblies and nanomaterial continue to be commonly used platforms to devise sensors for amino acids followed by surfactant assemblies. Conclusion: The broad implications of amino acids in human health and diagnosis have stirred a lot of interest to develop optimized optical detection systems for amino acids in recent years, using different materials based on chemical and biological scaffolds. We have also attempted to highlight the merits and demerits of some of the noteworthy sensor systems to instigate further efforts for constructing amino acids sensor based on unconventional concepts.

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Al-Ashwal, Nagi H., Khaled A. M. Al Soufy, Mohga E. Hamza, and Mohamed A. Swillam. "Deep Learning for Optical Sensor Applications: A Review." Sensors 23, no. 14 (July 18, 2023): 6486. http://dx.doi.org/10.3390/s23146486.

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Over the past decade, deep learning (DL) has been applied in a large number of optical sensors applications. DL algorithms can improve the accuracy and reduce the noise level in optical sensors. Optical sensors are considered as a promising technology for modern intelligent sensing platforms. These sensors are widely used in process monitoring, quality prediction, pollution, defence, security, and many other applications. However, they suffer major challenges such as the large generated datasets and low processing speeds for these data, including the high cost of these sensors. These challenges can be mitigated by integrating DL systems with optical sensor technologies. This paper presents recent studies integrating DL algorithms with optical sensor applications. This paper also highlights several directions for DL algorithms that promise a considerable impact on use for optical sensor applications. Moreover, this study provides new directions for the future development of related research.

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Kochanowicz, Marcin, and Jakub Markiewicz. "Application of optical reflectometer for monitoring corrosion process." Photonics Letters of Poland 14, no. 2 (July 1, 2022): 40. http://dx.doi.org/10.4302/plp.v14i2.1144.

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In this work, a corrosion sensor based on an optical time domain reflectometer was presented. The first sensor with a bare tip was used to measure the corrosion process of silica glass fiber. Another sensor with a deposited silver layer was used for monitoring the corrosion process in nitric acid. In both cases, reflectance at the end of the fiber was decreasing with immersion time. Thus we can describe the corrosion stage by the level of fresnel reflectance. The maximum sensitivities of the analyzed sensors were as follows: 0.7dB/min (3% HF solution) 0.15dB/h (5%HNO3 solution) Results showed that the corrosion process in all cases wasn’t fully linear, and all reactions began almost instantly after immersing sensors in tested corrosive environments. Full Text: PDF ReferencesC. Elosua, F.J. Arregui et al., "Micro and Nanostructured Materials for the Development of Optical Fibre Sensors", Sensors, 17, 2312 (2017). CrossRef B.H. Lee, Y.H. Kim et al., "Interferometric Fiber Optic Sensors", Sensors, 12, 2467 (2012). CrossRef X. Wang, O.S. Wolfbeis, "Fiber-Optic Chemical Sensors and Biosensors" (2013-2015), Analytical Chemistry, 88, 203 (2016). CrossRef M.A. Butler, "Fiber Optic Sensor for Hydrogen Concentrations near the Explosive Limit", J. Electrochem. Soc., 138, 46 (1991). CrossRef M.A. Butler, "Optical Fiber hydrogen sensor", Appl. Phys. Lett. 45, 1007 (1984). CrossRef S.F. Silva, L. Coelho et al., "A Reviev of Palladium-Based Fiber-Optic Sensors for Molecular Hydrogen Detection", IEEE Sens. J., 12, 93 (2012). CrossRef C. Floridia, F.C. Salgado et al., "Methane leak detection and spectral analysis by using only optical time domain reflectrometry in semidistributed remote optical sensors", IEEE Sens., 2016. CrossRef J.F. Martins-Filho, E. Fontana et al., Fiber-optic-based Corrosion Sensor using OTDR, IEEE SENSORS 2007 Conference (2007). CrossRef E.A. Lima, A.C. Bruno, "Improving the detection of Flaws in Steel Pipes Using SQUID Planar Gradiometers", IEEE Trans. Appl. Supercond. 11, 1299 (2001). CrossRef J. Yin, J. Pineda de Gyvez et al., "Real-Time Full Signature Corrosion Detection of Underground Casing Pipes", IEEE Instrumentation and Measurement Technology Conference (1996). CrossRef H. Park, D. Kim et al., "HF etched glass substrated for improved thin-film solar cells", Heliyon, 4, 10, (2018). CrossRef M. Mozammel, "Kinetics of Silver Dissolution in Nitric Acid from Ag-Au0:04-Cu0:10 and Ag-Cu0:23 Scraps", J. Mater. Sci. Technol., 22, 696 (2006). DirectLink

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Raj, Rajnish, Pooja Lohia, and D. K. Dwivedi. "Optical Fibre Sensors for Photonic Applications." Sensor Letters 17, no. 10 (October 1, 2019): 792–99. http://dx.doi.org/10.1166/sl.2019.4152.

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Recent development in optical fiber and numerous advantages of light over electronic system have boosted the utility and demand for optical fibre sensor in modern era. Optical fibre sensor is used to measure the various parameters like temperature, pressure, vibration, rotation etc. Optical fibre sensor offers a wide spectrum of advantage over traditional sensing system in terms of longer lifetime and small in size. Optical fibre has been considered as not only the substitutes of conventional sensors but also the unique solutions in the field of scientific engineering and industrial research. This paper reports the status of optical fibre sensor and its application in detail.

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Xu, Cheng, and Zahra Sharif Khodaei. "A Novel Fabry-Pérot Optical Sensor for Guided Wave Signal Acquisition." Sensors 20, no. 6 (March 19, 2020): 1728. http://dx.doi.org/10.3390/s20061728.

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In this paper, a novel hybrid damage detection system is proposed, which utilizes piezoelectric actuators for guided wave excitation and a new fibre optic (FO) sensor based on Fabry-Perot (FP) and Fiber Bragg Grating (FBG). By replacing the FBG sensors with FBG-based FP sensors in the hybrid damage detection system, a higher strain resolution is achieved, which results in higher damage sensitivity and higher reliability in diagnosis. To develop the novel sensor, optimum parameters such as reflectivity, a wavelength spectrum, and a sensor length were chosen carefully through an analytical model of the sensor, which has been validated with experiments. The sensitivity of the new FBG-based FP sensors was compared to FBG sensors to emphasize the superiority of the new sensors in measuring micro-strains. Lastly, the new FBG-based FP sensor was utilized for recording guided waves in a hybrid setup and compared to the conventional FBG hybrid sensor network to demonstrate their improved performance for a structural health monitoring (SHM) application.

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Caroleo, Fabrizio, Gabriele Magna, Mario Luigi Naitana, Lorena Di Zazzo, Roberto Martini, Francesco Pizzoli, Mounika Muduganti, et al. "Advances in Optical Sensors for Persistent Organic Pollutant Environmental Monitoring." Sensors 22, no. 7 (March 30, 2022): 2649. http://dx.doi.org/10.3390/s22072649.

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Optical chemical sensors are widely applied in many fields of modern analytical practice, due to their simplicity in preparation and signal acquisition, low costs, and fast response time. Moreover, the construction of most modern optical sensors requires neither wire connections with the detector nor sophisticated and energy-consuming hardware, enabling wireless sensor development for a fast, in-field and online analysis. In this review, the last five years of progress (from 2017 to 2021) in the field of optical chemical sensors development for persistent organic pollutants (POPs) is provided. The operating mechanisms, the transduction principles and the types of sensing materials employed in single selective optical sensors and in multisensory systems are reviewed. The selected examples of optical sensors applications are reported to demonstrate the benefits and drawbacks of optical chemical sensor use for POPs assessment.

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Watts, Sam. "Optical microchip sensors." Nature Photonics 4, no. 7 (July 2010): 433–34. http://dx.doi.org/10.1038/nphoton.2010.150.

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Walt, David R., Venetka Agayn, Karen Bronk, and Steven Barnard. "Fluorescent optical sensors." Applied Biochemistry and Biotechnology 41, no. 1-2 (April 1993): 129–38. http://dx.doi.org/10.1007/bf02918538.

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Udd, Eric. "Optical fiber sensors." Fiber and Integrated Optics 11, no. 4 (October 1992): 319–36. http://dx.doi.org/10.1080/01468039208204198.

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Chen, Yongzhang, Yiwen Zheng, Haibing Xiao, Dezhi Liang, Yufeng Zhang, Yongqin Yu, Chenlin Du, and Shuangchen Ruan. "Optical Fiber Probe Microcantilever Sensor Based on Fabry–Perot Interferometer." Sensors 22, no. 15 (August 1, 2022): 5748. http://dx.doi.org/10.3390/s22155748.

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Optical fiber Fabry–Perot sensors have long been the focus of researchers in sensing applications because of their unique advantages, including highly effective, simple light path, low cost, compact size, and easy fabrication. Microcantilever-based devices have been extensively explored in chemical and biological fields while the interrogation methods are still a challenge. The optical fiber probe microcantilever sensor is constructed with a microcantilever beam on an optical fiber, which opens the door for highly sensitive, as well as convenient readout. In this review, we summarize a wide variety of optical fiber probe microcantilever sensors based on Fabry–Perot interferometer. The operation principle of the optical fiber probe microcantilever sensor is introduced. The fabrication methods, materials, and sensing applications of an optical fiber probe microcantilever sensor with different structures are discussed in detail. The performances of different kinds of fiber probe microcantilever sensors are compared. We also prospect the possible development direction of optical fiber microcantilever sensors.

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Burratti, Luca, Fabio De Matteis, Roberto Francini, Joohyun Lim, Christina Scheu, and Paolo Prosposito. "Fluorescent Silver Nanoclusters Embedded in Hydrogel Matrix and Its Potential Use in Environmental Monitoring." Applied Sciences 11, no. 8 (April 13, 2021): 3470. http://dx.doi.org/10.3390/app11083470.

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The optical absorption and fluorescence of silver nanoclusters (AgNCs) are widely exploited in many different application fields such as sensors, bio-imaging, drug delivery, etc. In the sensor field, optical devices are highly versatile thanks to their ease of fabrication and low costs and, therefore, are optimal candidates to replace expensive apparatuses commonly used. In this study, we synthesized AgNCs in aqueous phase by photochemical synthesis using poly methacrylic acid (PMAA) as a stabilizer. Colloidal water solutions of these NCs showed a very good sensitivity to Pb(II) ions, and in order to fabricate a solid-state sensor, we introduced them in a hydrogel material formed by poly(ethylene glycol) diacrylate with a molecular weight of 700 g/mol (PEGDA700). The systems were characterized using absorption and fluorescence spectroscopy and transmission electron microscopy (TEM). Finally, the sensitivity to Pb(II) ions has been tested with the aim to use these systems as solid-state optical sensors for water quality.

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Champagne, Benoît, Aurélie Plaquet, Jean-Luc Pozzo, Vincent Rodriguez, and Frédéric Castet. "Nonlinear Optical Molecular Switches as Selective Cation Sensors." Journal of the American Chemical Society 134, no. 19 (May 8, 2012): 8101–3. http://dx.doi.org/10.1021/ja302395f.

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Jobert, Gabriel, Pierre Barritault, Maryse Fournier, Cyrielle Monpeurt, Salim Boutami, Cécile Jamois, Pietro Bernasconi, Andrea Lovera, Daniele Braga, and Christian Seassal. "Miniature Optical Particle Counter and Analyzer Involving a Fluidic-Optronic CMOS Chip Coupled with a Millimeter-Sized Glass Optical System." Sensors 21, no. 9 (May 3, 2021): 3181. http://dx.doi.org/10.3390/s21093181.

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Our latest advances in the field of miniaturized optical PM sensors are presented. This sensor combines a hybrid fluidic-optronic CMOS (holed retina) that is able to record a specific irradiance pattern scattered by an illuminated particle (scattering signature), while enabling the circulation of particles toward the sensing area. The holed retina is optically coupled with a monolithic, millimeter-sized, refracto-reflective optical system. The latter notably performs an optical pre-processing of signatures, with a very wide field of view of scattering angles. This improves the sensitivity of the sensors, and simplifies image processing. We report the precise design methodology for such a sensor, as well as its fabrication and characterization using calibrated polystyrene beads. Finally, we discuss its ability to characterize particles and its potential for further miniaturization and integration.

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Guzowski, Bartlomiej, and Mateusz Łakomski. "Temperature Sensor Based on Periodically Tapered Optical Fibers." Sensors 21, no. 24 (December 14, 2021): 8358. http://dx.doi.org/10.3390/s21248358.

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In this paper, the fabrication and characterization of a temperature sensor based on periodically tapered optical fibers (PTOF) are presented. The relation between the geometry of the sensors and sensing ability was investigated in order to find the relatively simple structure of a sensor. Four types of PTOF structures with two, four, six and eight waists were manufactured with the fusion splicer. For each PTOF type, the theoretical free spectral range (FSR) was calculated and compared with measurements. The experiments were conducted for a temperature range of 20–70 °C. The results proved that the number of the tapered regions in PTOF is crucial, because some of the investigated structures did not exhibit the temperature response. The interference occurring inside the structures with two and four waists was found be too weak and, therefore, the transmission dip was hardly visible. We proved that sensors with a low number of tapered regions cannot be considered as a temperature sensor. Sufficiently more valuable results were obtained for the last two types of PTOF, where the sensor’s sensitivity was equal to 0.07 dB/°C with an excellent linear fitting (R2 > 0.99). The transmission dip shift can be described by a linear function (R2 > 0.97) with a slope α > 0.39 nm/°C.

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Saito, Mitsunori, and Katsuhiro Kikuchi. "Infrared Optical Fiber Sensors." Optical Review 4, no. 5 (September 1997): 527–38. http://dx.doi.org/10.1007/s10043-997-0527-x.

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Cao, Rongtao, Jingyu Wu, Yang Yang, Mohan Wang, Yuqi Li, and Kevin P. Chen. "A High-Temperature Multipoint Hydrogen Sensor Using an Intrinsic Fabry–Perot Interferometer in Optical Fiber." Photonics 10, no. 3 (March 8, 2023): 284. http://dx.doi.org/10.3390/photonics10030284.

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This paper presents a multiplexable fiber optic chemical sensor with the capability of monitoring hydrogen gas concentration at high temperatures up to 750 °C. The Pd-nanoparticle infused TiO2 films coated on intrinsic Fabry–Perot interferometer (IFPI) array were used as sensory films. Strains induced upon exposure to hydrogen with varied concentrations can be monitored by IFPI sensors. The fiber sensor shows a repetitive and reversible response when exposed to a low level (1–6%) of hydrogen gas. Uniform sensory behavior across all the sensing cavities is demonstrated and reported in this paper.

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Simarjeet Singh Saini, Aneesh Sridhar, and Kulbir Ahluwalia. "Smartphone Optical Sensors." Optics and Photonics News 30, no. 2 (February 1, 2019): 34. http://dx.doi.org/10.1364/opn.30.2.000034.

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Bamiedakis, N., T. Hutter, R. V. Penty, I. H. White, and S. R. Elliott. "PCB-Integrated Optical Waveguide Sensors: An Ammonia Gas Sensor." Journal of Lightwave Technology 31, no. 10 (May 2013): 1628–35. http://dx.doi.org/10.1109/jlt.2013.2255582.

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Zhang, Miao, Jiangfan Shi, Chenglong Liao, Qingyun Tian, Chuanyi Wang, Shuai Chen, and Ling Zang. "Perylene Imide-Based Optical Chemosensors for Vapor Detection." Chemosensors 9, no. 1 (December 22, 2020): 1. http://dx.doi.org/10.3390/chemosensors9010001.

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Perylene imide (PI) molecules and materials have been extensively studied for optical chemical sensors, particularly those based on fluorescence and colorimetric mode, taking advantage of the unique features of PIs such as structure tunability, good thermal, optical and chemical stability, strong electron affinity, strong visible light absorption and high fluorescence quantum yield. PI-based optical chemosensors have now found broad applications in gas phase detection of chemicals, including explosives, biomarkers of some food and diseases (such as organic amines (alkylamines and aromatic amines)), benzene homologs, organic peroxides, phenols and nitroaromatics, etc. In this review, the recent research on PI-based fluorometric and colorimetric sensors, as well as array technology incorporating multiple sensors, is reviewed along with the discussion of potential applications in environment, health and public safety areas. Specifically, we discuss the molecular design and aggregate architecture of PIs in correlation with the corresponding sensor performances (including sensitivity, selectivity, response time, recovery time, reversibility, etc.). We also provide a perspective summary highlighting the great potential for future development of PIs optical chemosensors, especially in the sensor array format that will largely enhance the detection specificity in complexed environments.

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Wang, Wen C. "Optical electric-field sensors." Optical Engineering 45, no. 12 (December 1, 2006): 124402. http://dx.doi.org/10.1117/1.2404611.

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Fontani, D., P. Sansoni, F. Francini, D. Jafrancesco, L. Mercatelli, and E. Sani. "Pointing Sensors and Sun Tracking Techniques." International Journal of Photoenergy 2011 (2011): 1–9. http://dx.doi.org/10.1155/2011/806518.

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Every optical system for sunlight concentration requires following the sun in its movement. The sun tracking method is essentially chosen on the base of collection geometry and optical system configuration. A simple, useful, and original technique to realise sun tracking is proposed. It is based on a double guiding system using two complementary procedures. A passive tracking device performs a preliminary collector orientation. Then an active tracking system realises its fine positioning and adjustments exploiting an optical pointing sensor. The core of this active tracking device is the sun finder. Pointing sensors for fibre-coupled, CPV (Concentrating Photo voltaic), and linear collectors are presented, illustrating in detail the working principle and practical use. All sensors were optically characterised in laboratory, under controlled and reproducible conditions. Some field tests completed the experimentation evaluating the sensors performance in outdoor working conditions.

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Nazarova, Anna, Anton Gurkov, Yaroslav Rzhechitskiy, Ekaterina Shchapova, Andrei Mutin, Alexandra Saranchina, Anastasiia Diagileva, Nadezhda Bolbat, Pavel Krivoshapkin, and Maxim Timofeyev. "Turn a Shrimp into a Firefly: Monitoring Tissue pH in Small Crustaceans Using an Injectable Hydrogel Sensor with Infrared Excitation and Visible Luminescence." Photonics 10, no. 6 (June 20, 2023): 697. http://dx.doi.org/10.3390/photonics10060697.

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Various implantable optical sensors are an emerging tool in animal physiology and medicine that may provide real-time information about body fluids without tissue extraction. Such sensors are often fluorescence-based and require strong visible external illumination during signal acquisition, which causes anxiety or even stress for small animals and thus may influence the physiological parameters being measured. In order to overcome this obstacle, here, we combined a fluorescent molecular pH probe with upconverting particles within a hydrogel fiber suitable for injection into small crustaceans. The green luminescence of the particles under non-visible infrared illumination excited fluorescence of the molecular probe and allowed for pH measurements after correction of the probe readout for luminescence intensity. The developed optical setup based on a common microscope ensured effective visualization of the sensor and spectral pH measurements through the translucent exoskeleton of the amphipod (Amphipoda, Crustacea) Eulimnogammarus verrucosus, endemic to ancient Lake Baikal. Testing the sensors in these cold-loving crustaceans under environmentally relevant temperature increases showed alkalization of amphipod internal media by 0.2 soon after the start of the experiment, while further increases led to acidification by 0.5. The applied approach for simple sensor preparation can be useful in building other implantable optical sensors for light-sensitive organisms.

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Peng, Jun, Shuhai Jia, Jiaming Bian, Shuo Zhang, Jianben Liu, and Xing Zhou. "Recent Progress on Electromagnetic Field Measurement Based on Optical Sensors." Sensors 19, no. 13 (June 27, 2019): 2860. http://dx.doi.org/10.3390/s19132860.

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Electromagnetic field sensors are widely used in various areas. In recent years, great progress has been made in the optical sensing technique for electromagnetic field measurement, and varieties of corresponding sensors have been proposed. Types of magnetic field optical sensors were presented, including probes-based Faraday effect, magnetostrictive materials, and magnetic fluid. The sensing system-based Faraday effect is complex, and the sensors are mostly used in intensive magnetic field measurement. Magnetic field optical sensors based on magnetic fluid have high sensitivity compared to that based on magnetostrictive materials. Three types of electric field optical sensors are presented, including the sensor probes based on electric-optic crystal, piezoelectric materials, and electrostatic attraction. The majority of sensors are developed using the sensing scheme of combining the LiNbO3 crystal and optical fiber interferometer due to the good electro-optic properties of the crystal. The piezoelectric materials-based electric field sensors have simple structure and easy fabrication, but it is not suitable for weak electric field measurement. The sensing principle based on electrostatic attraction is less commonly-used sensing methods. This review aims at presenting the advances in optical sensing technology for electromagnetic field measurement, analyzing the principles of different types of sensors and discussing each advantage and disadvantage, as well as the future outlook on the performance improvement of sensors.

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Lee, Songbi, and Joohyeon Lee. "Braided Fabrication of a Fiber Bragg Grating Sensor." Sensors 20, no. 18 (September 14, 2020): 5246. http://dx.doi.org/10.3390/s20185246.

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Our objective was to construct textile braiding manufacturing methods to facilitate high precision and accurate measurements using optical fiber Bragg grating sensors for various structures. We aimed to combine three-dimensional (3D) braiding processing with the optical Bragg grating sensor’s accurate metrology. Outside the limits of the sensor’s epoxy attachment methods, the textile braiding method can diversify the scope of application. The braiding process can be used to design a 3D fabric module process for multiple objective mechanical fiber arrangements and material characteristics. Optical stress–strain response conditions were explored through the optimization of design elements between the Bragg grating sensor and the braiding. Here, Bragg grating sensors were located 75% away from the fiber center. The sensor core structure was helical with a 1.54 cm pitch, and a polyurethane synthetic yarn was braided together with the sensor using a weaving machine. From the prototype results, a negative Poisson’s ratio resulted in a curled braided Bragg grating sensor. The number of polyurethane strands was studied to determine the role of wrap angle in the braiding. The 12-strands condition showed an increase in double stress–strain response rate at a Poisson’s ratio of 1.3%, and the 16-strands condition was found to have noise affecting the sensor at a Poisson’s ratio of 1.5%. The findings suggested the application of braiding fabrication to the Bragg grating sensor could help to develop a new monitoring sensor.

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Zhu, Chen, and Osamah Alsalman. "Vernier effect-based optical fiber sensor for dynamic sensing using a coarsely resolved spectrometer." Optics Express 31, no. 13 (June 16, 2023): 22250. http://dx.doi.org/10.1364/oe.493302.

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Vernier effect-based optical fiber sensors have been demonstrated for high-sensitivity measurements of a diverse array of physical and chemical parameters. The interrogation of a Vernier sensor typically needs a broadband source and an optical spectrum analyzer to measure amplitudes over a broad wavelength window with dense sampling points, facilitating accurate extraction of the Vernier modulation envelope for sensitivity-improved sensing. However, the stringent requirement on the interrogation system limits the dynamic sensing capability of Vernier sensors. In this work, the possibility of employing a light source with a small wavelength bandwidth (35 nm) and a coarsely resolved spectrometer (∼166 pm) for the interrogation of an optical fiber Vernier sensor is demonstrated with the assistance of a machine learning-based analysis technique. Dynamic sensing of the exponential decay process of a cantilever beam has been successfully implemented with the low-cost and intelligent Vernier sensor. This work represents a first step towards a simpler, faster, and cheaper way to characterize the response of optical fiber sensors based on the Vernier effect.

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Zhao, Min, Xing Zhou, and Yazhou Chen. "A Highly Sensitive and Miniature Optical Fiber Sensor for Electromagnetic Pulse Fields." Sensors 21, no. 23 (December 6, 2021): 8137. http://dx.doi.org/10.3390/s21238137.

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The detection of an electromagnetic pulse (EMP) field is of great significance in determining the field environment of tested equipment in small spaces. Finger-shaped miniature optical fiber sensors for electromagnetic pulse field measurement were designed. The antenna of a weak field sensor was integrated with a shielding shell, and the wire welded at the direct electro-optic converting circuit connected to an optical fiber through special structure and circuit design was taken as the antenna of a strong field sensor. Measurements in the time domain and frequency domain had been carried out for the two sensors. Experiment results demonstrate that the weak field sensor and the strong field sensor have flat responses from 100 kHz to 1 GHz with a variation of 2.3 dB and 2.9 dB, respectively, and the EMP waveform detected by the sensors agrees well with the applied standard square wave. Moreover, the strong field sensor exhibits linear responses from 645 V/m to 83 kV/m. The resolution of the weak field sensor is as low as 13 V/m. The result indicated that the designed sensors had good performance.

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Ferreira, Mário F. S., Enrique Castro-Camus, David J. Ottaway, José Miguel López-Higuera, Xian Feng, Wei Jin, Yoonchan Jeong, et al. "Roadmap on optical sensors." Journal of Optics 19, no. 8 (July 24, 2017): 083001. http://dx.doi.org/10.1088/2040-8986/aa7419.

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Isayama, Yuri Hayashi, and Hugo Enrique Hernández-Figueroa. "High-Order Multimode Waveguide Interferometer for Optical Biosensing Applications." Sensors 21, no. 9 (May 8, 2021): 3254. http://dx.doi.org/10.3390/s21093254.

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A generalization of the concept of multimode interference sensors is presented here for the first time, to the best of our knowledge. The existing bimodal and trimodal sensors correspond to particular cases of those interference sensors. A thorough study of the properties of the multimode waveguide section provided a deeper insight into the behavior of this class of sensors, which allowed us to establish new criteria for designing more sensitive structures. Other challenges of using high-order modes within the sensing area of the device reside in the excitation of these modes and the interpretation of the output signal. To overcome these, we developed a novel structure to excite any desired high-order mode along with the fundamental mode within the sensing section, while maintaining a fine control over the power distribution between them. A new strategy to detect and interpret the output signal is also presented in detail. Finally, we designed a high-order sensor for which numerical simulations showed a theoretical limit of detection of 1.9×10−7 RIU, making this device the most sensitive multimode interference sensor reported so far.

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Ushakov, Evgeny N., Michael V. Alfimov, and Sergei P. Gromov. "Crown Ether Based Optical Molecular Sensors and Photocontrolled Ionophores." Macroheterocycles 3, no. 4 (2010): 189–200. http://dx.doi.org/10.6060/mhc2010.4.189.

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Chen, Wei, Zihui Meng, Min Xue, and Kenneth J. Shea. "Molecular imprinted photonic crystal for sensing of biomolecules." Molecular Imprinting 4, no. 1 (January 16, 2016): 1–12. http://dx.doi.org/10.1515/molim-2016-0001.

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AbstractMolecularly imprinted polymers (MIPs) are highly cross-linked polymers with high binding capacity and selectivity to the target molecules. MIPs become increasingly important because of the potential applications in drug delivery, purification and separation. In spite of the tremendous progress that has been made in the molecular imprinting field, many challenges remain to be addressed, especially in transforming the binding event into a detectable optical signal. The combination of photonic crystal and molecular imprinting technique is becoming a popular research idea. Compared to the conventional MIPs, the molecularly imprinted photonic crystal sensors (MIPCB) have the advantage of directly convert the molecule recognition process into optical signal. This review comprehensively summarizes various MIPCB, including the principle of molecular imprinted photonic crystal sensors, recent development, some challenges and effective strategies for MIPCB.

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Wang, Wei, Li, Du, and Zhang. "Optical Parameters Optimization for All-Time Star Sensor." Sensors 19, no. 13 (July 4, 2019): 2960. http://dx.doi.org/10.3390/s19132960.

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As an important development direction of star sensor technology, the All-Time star sensor technology can expand the application of star sensors to flight platforms inside the atmosphere. Due to intense atmospheric background radiation during the daytime, the commonly used star sensors operating in the visible wavelength range are significantly limited in their ability to detect stars, and hence the All-Time star sensor technology which is based on the shortwave infrared (SWIR) imaging system has become an effective research direction. All-Time star sensor detection capability is significantly affected by observation conditions and, therefore, an optimized selection of optical parameters, which mainly includes the field of view (FOV) and the detection wavelength band, can effectively improve the detection performance of All-Time star sensors under harsh observation conditions. This paper uses the model simulation method to analyze and optimize the optical parameters under various observation conditions in a high-altitude environment. A main parameter among those discussed is the analysis of detection band optimization based on the SWIR band. Due to the huge cost constraints of high-altitude experiments, we conducted experiments near the ground to verify the effectiveness of the detection band selection and the correctness of the SWIR star sensor detection model, which thereby proved that the optimization of the optical parameters for high altitudes was effective and could be used as a reference.

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Arcadio, Francesco, Chiara Marzano, Domenico Del Prete, Luigi Zeni, and Nunzio Cennamo. "Analysis of Plasmonic Sensors Performance Realized by Exploiting Different UV-Cured Optical Adhesives Combined with Plastic Optical Fibers." Sensors 23, no. 13 (July 6, 2023): 6182. http://dx.doi.org/10.3390/s23136182.

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Polymer-based surface plasmon resonance (SPR) sensors can be used to realize simple, small-size, disposable, and low-cost biosensors for application in several fields, e.g., healthcare. The performance of SPR sensors based on optical waveguides can be changed by tuning several parameters, such as the dimensions and the shape of the waveguides, the refractive index of the core, and the metal nanofilms used to excite the SPR phenomenon. In this work, in order to develop, experimentally test, and compare several polymer-based plasmonic sensors, realized by using waveguides with different core refractive indices, optical adhesives and 3D printed blocks with a trench inside have been used. In particular, the sensors are realized by filling the blocks’ trenches (with two plastic optical fibers located at the end of these) with different UV-cured optical adhesives and then covering them with the same bilayer to excite the SPR phenomenon. The developed SPR sensors have been characterized by numerical and experimental results. Finally, in order to propose photonic solutions for healthcare, a comparative analysis has been reported to choose the best sensor configuration useful for developing low-cost biosensors.

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Yesilkoy, Filiz. "Optical Interrogation Techniques for Nanophotonic Biochemical Sensors." Sensors 19, no. 19 (October 3, 2019): 4287. http://dx.doi.org/10.3390/s19194287.

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The manipulation of light via nanoengineered surfaces has excited the optical community in the past few decades. Among the many applications enabled by nanophotonic devices, sensing has stood out due to their capability of identifying miniscule refractive index changes. In particular, when free-space propagating light effectively couples into subwavelength volumes created by nanostructures, the strongly-localized near-fields can enhance light’s interaction with matter at the nanoscale. As a result, nanophotonic sensors can non-destructively detect chemical species in real-time without the need of exogenous labels. The impact of such nanophotonic devices on biochemical sensor development became evident as the ever-growing research efforts in the field started addressing many critical needs in biomedical sciences, such as low-cost analytical platforms, simple quantitative bioassays, time-resolved sensing, rapid and multiplexed detection, single-molecule analytics, among others. In this review, the optical transduction methods used to interrogate optical resonances of nanophotonic sensors will be highlighted. Specifically, the optical methodologies used thus far will be evaluated based on their capability of addressing key requirements of the future sensor technologies, including miniaturization, multiplexing, spatial and temporal resolution, cost and sensitivity.

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Ochoa, Mario, José Francisco Algorri, Pablo Roldán-Varona, Luis Rodríguez-Cobo, and José Miguel López-Higuera. "Recent Advances in Biomedical Photonic Sensors: A Focus on Optical-Fibre-Based Sensing." Sensors 21, no. 19 (September 28, 2021): 6469. http://dx.doi.org/10.3390/s21196469.

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In this invited review, we provide an overview of the recent advances in biomedical photonic sensors within the last five years. This review is focused on works using optical-fibre technology, employing diverse optical fibres, sensing techniques, and configurations applied in several medical fields. We identified technical innovations and advancements with increased implementations of optical-fibre sensors, multiparameter sensors, and control systems in real applications. Examples of outstanding optical-fibre sensor performances for physical and biochemical parameters are covered, including diverse sensing strategies and fibre-optical probes for integration into medical instruments such as catheters, needles, or endoscopes.

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Paixão, Tiago, Ricardo Ferreira, M. Fátima Domingues, and Paulo Antunes. "Fiber Optic Load Cells with Enhanced Sensitivity by Optical Vernier Effect." Sensors 21, no. 22 (November 20, 2021): 7737. http://dx.doi.org/10.3390/s21227737.

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Developing technologies capable of constantly assessing and optimizing day-to-day activities has been a research priority for several years. A key factor in such technologies is the use of highly sensitive sensors to monitor in real-time numerous parameters, such as temperature and load. Due to their unique features, optical fiber sensors became one of the most interesting and viable solutions for applications dependent on those parameters. In this work, we present an optical fiber load sensor, called load cell, based on Fabry–Pérot hollow cavities embedded in a polymeric material. By using the load cells in a parallel configuration with a non-embedded hollow cavity, the optical Vernier effect was generated, allowing maximum sensitivity values of 0.433 nm N−1 and 0.66 nm °C−1 to be attained for vertical load and temperature, respectively. The proposed sensor’s performance, allied with the proposed configuration, makes it a viable and suitable device for a wide range of applications, namely those requiring high thermal and load sensitivities.

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Tseng, Shiao-Min, and Chin-Lin Chen. "Optical fiber Fabry-Perot sensors." Applied Optics 27, no. 3 (February 1, 1988): 547. http://dx.doi.org/10.1364/ao.27.000547.

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Zhang, Lei, Zhiyong Li, Jinxia Mu, Wei Fang, and Limin Tong. "Femtoliter-scale optical nanofiber sensors." Optics Express 23, no. 22 (October 21, 2015): 28408. http://dx.doi.org/10.1364/oe.23.028408.

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Bourquard, Aurélien, François Aguet, and Michael Unser. "Optical imaging using binary sensors." Optics Express 18, no. 5 (February 24, 2010): 4876. http://dx.doi.org/10.1364/oe.18.004876.

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Sumetsky, M. "Optimization of resonant optical sensors." Optics Express 15, no. 25 (2007): 17449. http://dx.doi.org/10.1364/oe.15.017449.

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Chen, Shuai, Zexu Xue, Nan Gao, Xiaomei Yang, and Ling Zang. "Perylene Diimide-Based Fluorescent and Colorimetric Sensors for Environmental Detection." Sensors 20, no. 3 (February 9, 2020): 917. http://dx.doi.org/10.3390/s20030917.

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Perylene tetracarboxylic diimide (PDI) and its derivatives exhibit excellent thermal, chemical and optical stability, strong electron affinity, strong visible-light absorption and unique fluorescence on/off features. The combination of these features makes PDIs ideal molecular frameworks for development in a broad range of sensors for detecting environmental pollutants such as heavy metal ions (e.g., Cu2+, Cd2+, Hg2+, Pd2+, etc.), inorganic anions (e.g., F−, ClO4−, PO4−, etc.), as well as poisonous organic compounds such as nitriles, amines, nitroaromatics, benzene homologues, etc. In this review, we provide a comprehensive overview of the recent advance in research and development of PDI-based fluorescent sensors, as well as related colorimetric and multi-mode sensor systems, for environmental detection in aqueous, organic or mixed solutions. The molecular design of PDIs and structural optimization of the sensor system (regarding both sensitivity and selectivity) in response to varying analytes are discussed in detail. At the end, a perspective summary is provided covering both the key challenges and potential solutions for the future development of PDI-based optical sensors.

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Hiba, Antal, Attila Gáti, and Augustin Manecy. "Optical Navigation Sensor for Runway Relative Positioning of Aircraft during Final Approach." Sensors 21, no. 6 (March 21, 2021): 2203. http://dx.doi.org/10.3390/s21062203.

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Precise navigation is often performed by sensor fusion of different sensors. Among these sensors, optical sensors use image features to obtain the position and attitude of the camera. Runway relative navigation during final approach is a special case where robust and continuous detection of the runway is required. This paper presents a robust threshold marker detection method for monocular cameras and introduces an on-board real-time implementation with flight test results. Results with narrow and wide field-of-view optics are compared. The image processing approach is also evaluated on image data captured by a different on-board system. The pure optical approach of this paper increases sensor redundancy because it does not require input from an inertial sensor as most of the robust runway detectors.

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Safarloo, Sahar, Arántzazu Núñez-Cascajero, Ruben Sanchez-Gomez, and Carmen Vázquez. "Polymer Optical Fiber Plantar Pressure Sensors: Design and Validation." Sensors 22, no. 10 (May 20, 2022): 3883. http://dx.doi.org/10.3390/s22103883.

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The proper measurement of plantar pressure during gait is critical for the clinical diagnosis of foot problems. Force platforms and wearable devices have been developed to study gait patterns during walking or running. However, these devices are often expensive, cumbersome, or have boundary constraints that limit the participant’s motions. Recent advancements in the quality of plastic optical fiber (POF) have made it possible to manufacture a low-cost bend sensor with a novel design for use in plantar pressure monitoring. An intensity-based POF bend sensor is not only lightweight, non-invasive, and easy to construct, but it also produces a signal that requires almost no processing. In this work, we have designed, fabricated, and characterized a novel intensity POF sensor to detect the force applied by the human foot and measure the gait pattern. The sensors were put through a series of dynamic and static tests to determine their measurement range, sensitivity, and linearity, and their response was compared to that of two different commercial force sensors, including piezo resistive sensors and a clinical force platform. The results suggest that this novel POF bend sensor can be used in a wide range of applications, given its low cost and non-invasive nature. Feedback walking monitoring for ulcer prevention or sports performance could be just one of those applications.

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Blanchard, F., J. E. Nkeck, L. Guiramand, S. Zibod, K. Dolgaleva, T. Arikawa, and K. Tanaka. "Two-dimensional space–time terahertz memory in bulk SrTiO₃." Optica 9, no. 9 (August 23, 2022): 980. http://dx.doi.org/10.1364/optica.463730.

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Polarizable materials with ultrafast responses are of great interest for the development of new sensors and memories under the influence of an electromagnetic field. Recent research efforts have demonstrated the role of optical excitation and intense terahertz (THz) pulses in inducing an ultrafast polar order and revealing a hidden phase transition in S r T i O 3 (STO), respectively. Here we show that the surfaces of STO crystals at room temperature act as ultrafast sensors that enable sub-picosecond switching through the Kerr effect and recording of polar THz intensity with spatial resolution below the diffraction limit through THz-field-induced dipole alignment followed by multi-picosecond relaxation time recovery. The contrast sensitivity and spatial resolution achieved by the STO sensor are significantly superior to those of present-day near-field THz sensors based on the linear Pockels effect, and more importantly, its ability to remain polarized for several picoseconds opens the door to a new strategy for building an ultrafast space–time THz memory.

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Mizaikoff, B. "Infrared optical sensors for water quality monitoring." Water Science and Technology 47, no. 2 (January 1, 2003): 35–42. http://dx.doi.org/10.2166/wst.2003.0079.

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In-situ monitoring of water quality with particular emphasis on organic pollutants is a global priority topic in water analysis. Recent developments in optical sensor technology provide advanced analytical tools for continuous assessment of pollution levels in the liquid phase and in the gas phase. Infrared sensing schemes are among the most promising concepts due to inherent molecular specificity provided by absorption patterns of fundamental molecular vibrations of organic molecules. The advent of mid-infrared transparent optical fibers and waveguides, appropriate light source technology, such as quantum cascade lasers, and the potential for the development of highly integrated analytical devices based on microfabrication technology substantiates the trend towards spectroscopic sensing techniques. Chemical modification of the waveguide surface leads to enhanced analyte recognition based on tunable properties of enrichment or (bio)chemical recognition layers. Discussion of fundamental sensing technology is complemented by recent examples, highlighting the state-of-the-art in this dynamic research field.

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Moś, Joanna Ewa, Karol Antoni Stasiewicz, and Leszek Roman Jaroszewicz. "Liquid crystal cell with a tapered optical fiber as an active element to optical applications." Photonics Letters of Poland 11, no. 1 (April 3, 2019): 13. http://dx.doi.org/10.4302/plp.v11i1.879.

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The work describes the technology of a liquid crystal cell with a tapered optical fiber as an element providing light. The tapered optical fiber with the total optical loss of 0.22 ± 0.07 dB, the taper waist diameter of 15.5 ± 0.5 μm, and the elongation of 20.4 ± 0.3 mm has been used. The experimental results are presented for a liquid crystal cell filled with a mixture 1550* for parallel orientation of LC molecules to the cross section of the taper waist. Measurement results show the influence of the electrical field with voltage in the range of 0-200 V, without, as well as with different modulation for spectral characteristics. The sinusoidal and square signal shapes are used with a 1-10 Hz frequency range. Full Text: PDF ReferencesZ. Liu, H. Y. Tam, L. Htein, M. L.Vincent Tse, C. Lu, "Microstructured Optical Fiber Sensors", J. Lightwave Technol. 35, 16 (2017). CrossRef T. R. Wolinski, K. Szaniawska, S. Ertman1, P. Lesiak, A. W. Domański, R. Dabrowski, E. Nowinowski-Kruszelnicki, J. 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Journal articles on the topic 'Optical Molecular Sensors'

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