Artykuły w czasopismach: „UV light detection”

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Karaduman, Irmak, Dilber E. Yıldız, Mehmet M. Sincar i Selim Acar. "UV light activated gas sensor for NO2 detection". Materials Science in Semiconductor Processing 28 (grudzień 2014): 43–47. http://dx.doi.org/10.1016/j.mssp.2014.04.011.

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Yamamoto, Seiichi, i Jun Kataoka. "Detection of luminescence from Vitamin B2 plate during alpha particle irradiation". Journal of Instrumentation 17, nr 11 (1.11.2022): T11005. http://dx.doi.org/10.1088/1748-0221/17/11/t11005.

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Abstract Vitamin B2 (V-B2) is a material that converts shorter-wavelength light such as ultraviolet (UV) light to longer-wavelength light. However, it is not clear whether longer-wavelength light is produced by the irradiation of alpha particles. Because UV light such as Cherenkov light is required to produce longer-wavelength light for V-B2 and alpha particles do not produce Cherenkov light in a material, no light is expected to be emitted in V-B2 by the irradiation of alpha particles. However, we irradiated alpha particles to a V-B2 plate and measured the produced light in the plate. During irradiation of alpha particles, a significant amount of longer-wavelength light was observed from the V-B2 plate. The luminescence intensity of the V-B2 plate during irradiation of alpha particles was ∼1/6 of that of the plastic scintillator. The spectrum of luminescence from the V-B2 plate during this irradiation was the same as that emitted by the irradiation of ultraviolet (UV) light, which possibly indicates UV or shorter-wavelength light production in the V-B2 plate by the irradiation of alpha particles. This longer-wavelength light is not attributed to the UV light from the air scintillation by the alpha particles but to the direct irradiation of alpha particles to the V-B2 plate. From these results, we conclude that the luminescence of the V-B2 plate was the scintillation by the irradiation of alpha particles, or other phenomenon that was; UV as well as shorter-wavelength visible light was produced in the V-B2 plate by the irradiation of alpha particles and that the longer-wavelength light was produced from this light. The UV light was produced from the light generated by the dipole interaction of moving secondary electrons with V-B2 or binder molecules and then converted to the longer-wavelength light with a slower decay of the V-B2 in the plate that had high intensity due to the decreased simultaneity of the light emission.

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NERGUIZIAN, Vahé, Mustapha RAFAF, Muthukumaran PACKIRISAMY i Ion STIHARU. "ULTRA VIOLET DETECTION SENSORS". International Journal of High Speed Electronics and Systems 16, nr 02 (czerwiec 2006): 583–88. http://dx.doi.org/10.1142/s0129156406003862.

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This article presents an innovative and creative approach to detect harmful level of Ultra Violet light on human skin. Different commercial UV sensors are evaluated for comparison. The comparison is made for performance, cost and dimension. The proposed affordable UV sensor solutions are presented using chemical and MEMS/MOEMS technologies. The UV dynamic sensor detects the harmful level of UV and informs the user about the eventual UV radiation risk. The proposed two solutions consider chemical material for UV detection and different actuation mechanism to inform the UV harmful level to the user. These sensors are non disposable and are packaged for visual monitoring (without battery) and acoustic operation (using a battery).

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Kume, Naoto, Akio Sumita, Naoya Sakamoto, Takeshi Hoshi, Koki Okazaki, Haruo Miyadera, Yasufumi Miyahara i Yuki Nakai. "Alpha emitter detection systems using a UV light detector". Applied Optics 61, nr 6 (15.02.2022): 1414. http://dx.doi.org/10.1364/ao.446006.

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Yaakobovitz, Barak, Yoel Cohen i Yoed Tsur. "Line edge roughness detection using deep UV light scatterometry". Microelectronic Engineering 84, nr 4 (kwiecień 2007): 619–25. http://dx.doi.org/10.1016/j.mee.2006.12.002.

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Lai, Connie, Peter J. Bush, Stephen Warunek, David A. Covell i Thikriat Al-Jewair. "An in vitro comparison of ultraviolet versus white light in the detection of adhesive remnants during orthodontic debonding". Angle Orthodontist 89, nr 3 (17.01.2019): 438–45. http://dx.doi.org/10.2319/072018-526.1.

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ABSTRACT Objectives: To assess the effectiveness and efficiency of ultraviolet (UV) illumination compared to conventional white light in the detection of fluorescent-tagged adhesive remnants during orthodontic debonding. Materials and Methods: Orthodontic brackets were bonded to extracted human premolars using one of two bonding resins having fluorescent properties (Pad Lock, Reliance Orthodontics, Itasca, Ill; Opal Bond MV, Opal Orthodontics, South Jordan, Utah; n = 40 each). The brackets were then debonded and, in each adhesive group, half the teeth had the remaining adhesive resin removed under illumination using the operatory light and the other half using a UV (395 nm) light emitting diode (LED) flashlight (n = 20/group). Time for teeth cleanup was recorded. Follow-up images were obtained under a dissecting microscope using UV illumination, and the surface area of adhesive remnants was calculated. Effectiveness of adhesive removal was also assessed using scanning electron microscopy imaging. Analysis of variance and Kruskal-Wallis tests were used to analyze time and adhesive remnants, respectively. Results: Assessment using the dissecting microscope found groups using UV light during adhesive removal had statistically significantly lower amounts of adhesive remnants than groups using white light (P ≤ .01). Time for adhesive removal was significantly lower with Opal Bond MV adhesive using UV light when compared with the white light (P ≤ .01). Assessment by scanning electron microscopy showed that thin remnants of adhesive (<2 μm) remained undetected by UV illumination. Conclusions: UV light is more effective and tends to be more efficient than white light in the detection of fluorescent adhesive during orthodontic debonding. Although there are limitations, the use of UV LED lighting is a practical tool that aids in adhesive detection.

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Boscarino, Filice, Sciuto, Libertino, Scuderi, Galati i Scalese. "Investigation of ZnO-decorated CNTs for UV Light Detection Applications". Nanomaterials 9, nr 8 (31.07.2019): 1099. http://dx.doi.org/10.3390/nano9081099.

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Multi-walled carbon nanotubes (CNTs) decorated with zinc oxide nanoparticles (ZnO NPs) were prepared in isopropanol solution by a simple, room-temperature process and characterized from structural, morphological, electronic, and optical points of view. A strong interaction between ZnO and CNTs is fully confirmed by all the characterization techniques. ZnO-CNTs nanocomposites, with different weight ratios, were deposited as a dense layer between two electrodes, in order to investigate the electrical behaviour. In particular, the electrical response of the nanocomposite layers to UV light irradiation was recorded for a fixed voltage: As the device is exposed to the UV lamp, a sharp current drop takes place and then an increase is observed as the irradiation is stopped. The effect can be explained by adsorption and desorption phenomena taking place on the ZnO nanoparticle surface under irradiation and by charge transfer between ZnO and CNTs, thanks to the strong interaction between the two nanomaterials. The nanocomposite material shows good sensitivity and fast response to UV irradiation. Room temperature and low-cost processes used for the device preparation combined with room temperature and low voltage operational conditions make this methodology very promising for large scale UV detectors applications.

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Arachchige, Hashitha M. M. Munasinghe, Nanda Gunawardhana, Dario Zappa i Elisabetta Comini. "UV Light Assisted NO2Sensing by SnO2/Graphene Oxide Composite". Proceedings 2, nr 13 (23.11.2018): 787. http://dx.doi.org/10.3390/proceedings2130787.

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Nitric oxide (NO2) is one of the air pollutants that pose serious environmental concerns over the years. In this study, SnO2 nanowires were synthesized by evaporation-condensation method and graphene oxide were synthesized using modified Hummers method for low temperature NO2 detection. Drop cast method was used to transfer graphene oxide (GO), to form composite GO-metal oxide p-n junctions. With integration of reduce graphene oxide (rGO), the UV light absorption was enhanced. This metal oxide composite has shown a reversible response in detecting low concentrations of NO2 under UV irradiation, with a working temperature range of 50–150 °C. Pure SnO2 shows 20% response to NO2 (4 ppm) in dark conditions, while the response increasesupto60%usingUVirradiationat50°C.Furthermore, SnO2/rGOshowsa40%ofresponse in dark, while the response increases to 160% under UV light illumination. This composite exhibits excellent recovery and maintains the baseline under UV light at low temperatures, which effectively overcome the drawbacks of low recovery typically shown by metal oxide gas sensors at low temperature.

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Mazzillo, Massimo, Antonella Sciuto, Fabrizio Roccaforte, Corrado Bongiorno, Roberto Modica, Salvatore Marchese, Paolo Badalà i in. "Ni₂Si/4H-SiC Schottky Photodiodes for Ultraviolet Light Detection". Materials Science Forum 858 (maj 2016): 1015–18. http://dx.doi.org/10.4028/www.scientific.net/msf.858.1015.

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Ultraviolet (UV) monitoring is of great interest in the healthcare field to prevent excessive UV exposure risks. In the last years silicon carbide (SiC) has emerged as a suitable material for the fabrication of UV detectors. In this paper we propose a 4H-SiC Schottky photodiode with a continuous very thin Ni2Si layer operating at 0V, properly designed for UV radiation monitoring.

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Wu, Kuijun, Zihao Zhang, Jianjun Guo, Xiangrui Hu, Juan Li, Faquan Li i Weiwei He. "Effect of UV Scattering on Detection Limit of SO2 Cameras". Remote Sensing 15, nr 3 (25.01.2023): 705. http://dx.doi.org/10.3390/rs15030705.

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SO2 ultraviolet (UV) camera technology has been successfully applied to the accurate imaging detection of pollutant gas concentration; however, the actual detection ability of this technology has not been intensively studied, especially the detection accuracy and limit under the influence of the light dilution effect. Here, we theoretically and experimentally investigate the UV scattering on SO2 concentration inversion. The radiation transfer model of the light dilution effect is reconstructed, and the concept of the optimized detection limit is discussed. An outfield experiment is conducted on a ship exhaust, and the results are compared with the theoretical calculations, which indicates that the detection limit of the SO2 UV camera is 15 ppm·m at close range and increases to 25 ppm·m when the detection distance is 3.5 km. This study proves that the detection limit of the SO2 UV camera deteriorates with the decreasing atmospheric visibility, the lengthening detection distance, and the increasing aerosol content within the plume. In addition, the hardware indicators of the camera systems also play a key role in the detection limit, and taking reasonable image processing can significantly release the instruments’ performance and extend the applicability of the SO2 UV camera.

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Song, Kai, Nan Ma, Yogendra Kumar Mishra, Rainer Adelung i Ya Yang. "Achieving Light-Induced Ultrahigh Pyroelectric Charge Density Toward Self-Powered UV Light Detection". Advanced Electronic Materials 5, nr 1 (21.10.2018): 1800413. http://dx.doi.org/10.1002/aelm.201800413.

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Suo, Shuang Fu, Jun Zheng Jia i Chun Yan Liu. "UV Signal Detection and Analysis of China Bank Check". Applied Mechanics and Materials 740 (marzec 2015): 604–7. http://dx.doi.org/10.4028/www.scientific.net/amm.740.604.

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This article describes the classification of China bank check, green fluorescent reaction under ultraviolet light source illumination of the featured regions—— invisible flower mission and motif pattern, and recognize the accuracy of detecting bank check feature area by signal processing and pattern recognition of UV green fluorescent response signal receiver at particular locations. It described the light filter for bank check, which is different from RMB Banknote

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Chen, Tunan, Fengxiang Ma, Yue Zhao, Zhenghai Liao, Zongjia Qiu i Guoqiang Zhang. "Cantilever enhanced based photoacoustic detection of SF₆ decomposition component SO₂ using UV LED". Sensor Review 42, nr 1 (13.01.2022): 70–75. http://dx.doi.org/10.1108/sr-12-2020-0292.

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Purpose This paper aims to establish a photoacoustic detection system for SO2 using UV-LED and testify its feasibility for sensitive measurement. The work in this paper can avoid potential crossover interference in infrared (IR) range and also balance the capability and cost of feasible excitation for photoacoustic detection system. Design/methodology/approach In this experimental work, a cantilever-enhanced–based photoacoustic SO2 detection system using an ultraviolet (UV) LED light source with a light power of 4 mW as the excitation was established. Findings A feasible photoacoustic detection system for SO2 using UV-LED was established. Experimental results demonstrate that the detection limit of the system can reach the level of 0.667 ppm, which can serve as a reference for the application of PAS in insulation fault diagnosis. Originality/value This work investigated the potential of using ultraviolet photoacoustic spectroscopy to detect trace SO2, which provided an ideal replacement of infrared-laser-based detection system. In this paper, a photoacoustic detection system using LED with a low light power was established. Low light power requirement can expand the options of light sources accordingly. In this paper, the absorption characteristics of SO2 in the presented detection system and ultraviolet range were studied. And the detection limit of the presented system was given. Both of which can provide reference to SO2 detection in ambient SF6.

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Al-Adhami, B. H., R. A. B. Nichols, J. R. Kusel, J. O'Grady i H. V. Smith. "Detection of UV-Induced Thymine Dimers in Individual Cryptosporidium parvum and Cryptosporidium hominis Oocysts by Immunofluorescence Microscopy". Applied and Environmental Microbiology 73, nr 3 (29.09.2006): 947–55. http://dx.doi.org/10.1128/aem.01251-06.

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ABSTRACT To investigate the effect of UV light on Cryptosporidium parvum and Cryptosporidium hominis oocysts in vitro, we exposed intact oocysts to 4-, 10-, 20-, and 40-mJï¿½cm−2 doses of UV irradiation. Thymine dimers were detected by immunofluorescence microscopy using a monoclonal antibody against cyclobutyl thymine dimers (anti-TDmAb). Dimer-specific fluorescence within sporozoite nuclei was confirmed by colocalization with the nuclear fluorogen 4′,6′-diamidino-2-phenylindole (DAPI). Oocyst walls were visualized using either commercial fluorescein isothiocyanate-labeled anti-Cryptosporidium oocyst antibodies (FITC-CmAb) or Texas Red-labeled anti-Cryptosporidium oocyst antibodies (TR-CmAb). The use of FITC-CmAb interfered with TD detection at doses below 40 mJï¿½cm−2. With the combination of anti-TDmAb, TR-CmAb, and DAPI, dimer-specific fluorescence was detected in sporozoite nuclei within oocysts exposed to 10 to 40 mJï¿½cm−2 of UV light. Similar results were obtained with C. hominis. C. parvum oocysts exposed to 10 to 40 mJï¿½cm−2 of UV light failed to infect neonatal mice, confirming that results of our anti-TD immunofluorescence assay paralleled the outcomes of our neonatal mouse infectivity assay. These results suggest that our immunofluorescence assay is suitable for detecting DNA damage in C. parvum and C. hominis oocysts induced following exposure to UV light.

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Jang, Yoon Jung, Vu Khac Hoang Bui, Phuong Thy Nguyen, Young-Chul Lee i Moon Il Kim. "UV-Light-Driven Enhancement of Peroxidase-Like Activity of Mg-Aminoclay-Based Fe3O4/TiO2 Hybrids for Colorimetric Detection of Phenolic Compounds". Chemosensors 9, nr 8 (11.08.2021): 219. http://dx.doi.org/10.3390/chemosensors9080219.

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Light-activated nanozymes possess several advantages, such as light-mediated activity regulation, utilization of molecular oxygen as a green oxidant, and highly enhanced activity; however, the types of light-activated nanozymes are still limited. In this study, we found that Mg aminoclay-based Fe3O4/TiO2 hybrids (MgAC-Fe3O4/TiO2) exhibited peroxidase-like catalytic activity to catalyze the oxidation of the peroxidase substrate 2,2′-azino-bis(3-ethylbenzo-thiazoline-6-sulfonic acid) diammonium salt (ABTS) in the presence of H2O2, which was significantly enhanced under ultraviolet (UV)-light irradiation. Compared with MgAC-Fe3O4 and MgAC-TiO2, MgAC-Fe3O4/TiO2 showed around three-fold enhancement in the absorption intensity corresponding to the oxidized ABTS under UV-light irradiation, presumably due to the synergistic effect between Fe3O4 and TiO2, thereby facilitating photocatalytic electron transfer during the catalytic action. In addition, the MgAC-Fe3O4/TiO2 showed vivid stability enhancement in wide range of pH and temperature values compared with natural peroxidase. The UV-light-driven MgAC-Fe3O4/TiO2-based system was successfully applied for the colorimetric detection of phenolic compounds, including pyrocatechol and resorcinol, in a dynamic linear range of 0.15–1.30 mg/mL with a limit of detection as low as 0.1 mg/mL. Further, the system could successfully determine the phenolic compounds in spiked tap water, and thus, it can be used for practical applications. We believe that the UV-light-driven enhancement in the peroxidase-like catalytic performances highlights the potential of MgAC-Fe3O4/TiO2 for detecting phenolic compounds as well as other clinically and environmentally important substances.

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Sarmah, Samarjit. "Fabrication of PS- MSM Device for Ultraviolet (UV) light Detection". International Journal for Research in Applied Science and Engineering Technology V, nr X (22.10.2017): 219–23. http://dx.doi.org/10.22214/ijraset.2017.10035.

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Das, Surajit, Ashok Kumar, Ajay Kumar, Jitendra Singh, Rajan Jha i Mahesh Kumar. "UV Light Detection Using Resonance Frequency of Piezoelectric Quartz Crystal". IEEE Transactions on Electron Devices 68, nr 6 (czerwiec 2021): 2791–95. http://dx.doi.org/10.1109/ted.2021.3072351.

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Joosten, S., E. Kaczanowicz, M. Ungaro, M. Rehfuss, K. Johnston i Z. E. Meziani. "Enhanced UV light detection using a p-terphenyl wavelength shifter". Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 870 (październik 2017): 110–15. http://dx.doi.org/10.1016/j.nima.2017.06.050.

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Zhang, Jian, Jie Zhou, Qingqing Zhou, Wen Wu, Huanxia Zhang, Xiangsong Lin, Qiulan Luo, Jianda Cao i Hui Ma. "Light-driven textile sensors with potential application of UV detection". RSC Advances 13, nr 8 (2023): 5266–72. http://dx.doi.org/10.1039/d2ra06607f.

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Smart textiles based on monitoring systems of health conditions, structural behaviour, and external environmental conditions have been presented as elegant solutions for the increasing demands of health care.

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Foley, Lauren E., i Patrick Emery. "Drosophila Cryptochrome: Variations in Blue". Journal of Biological Rhythms 35, nr 1 (10.10.2019): 16–27. http://dx.doi.org/10.1177/0748730419878290.

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CRYPTOCHROMES (CRYs) are structurally related to ultraviolet (UV)/blue-sensitive DNA repair enzymes called photolyases but lack the ability to repair pyrimidine dimers generated by UV exposure. First identified in plants, CRYs have proven to be involved in light detection and various light-dependent processes in a broad range of organisms. In Drosophila, CRY’s best understood role is the cell-autonomous synchronization of circadian clocks. However, CRY also contributes to the amplitude of circadian oscillations in a light-independent manner, controls arousal and UV avoidance, influences visual photoreception, and plays a key role in magnetic field detection. Here, we review our current understanding of the mechanisms underlying CRY’s various circadian and noncircadian functions in fruit flies.

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Che Soh, Mohammad Shafiq, Mastura Shafinaz Zainal Abidin, Shaharin Fadzli Abd Rahman, Shuthish Elangkovan i Ahmad Bukhairi Md Rashid. "Zinc oxide-paper based sensor for photoconductive ultraviolet detection". Indonesian Journal of Electrical Engineering and Computer Science 20, nr 1 (1.10.2020): 60. http://dx.doi.org/10.11591/ijeecs.v20.i1.pp60-66.

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Paper based sensor is the new technology to fabricate a simple, portable, and low cost device that exhibits the comparable properties and functions with those fabricated using complex fabrication process. Paper based sensor is usually applied in environmental monitoring, health diagnostics, and food quality control. This research is focusing on the paper based sensor that will contribute to the development of Ultraviolet (UV) sensor. The fabrication of the sensor was done by using different grade of pencil, namely 6B and 2B on different type of paper. The different grade of pencil corresponds to different percentage of graphite and clay. As for the type of paper, A4 printing paper and Whatman filter paper were used. UV sensing operation was analyzed from the measurement of current-voltage (I-V) characteristics under the exposure of UV light. Zinc oxide (ZnO) was coated on the sensor to facilitate the detection in the presence of UV. The sample fabricated using 6B pencil grade on A4 printing paper and with ZnO coating showed a better UV sensing performance compared to other samples. This is due to the high conduction of 6B pencil grade and smooth surface of A4 printing paper. The ZnO coating increased the sensor sensitivity and response towards the UV light. These findings provide valuable information which can be used in fabricating a low-cost and simple UV paper sensor.

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Lee, Brandon Chuan Yee, Fang Yee Lim, Wei Hao Loh, Say Leong Ong i Jiangyong Hu. "Emerging Contaminants: An Overview of Recent Trends for Their Treatment and Management Using Light-Driven Processes". Water 13, nr 17 (26.08.2021): 2340. http://dx.doi.org/10.3390/w13172340.

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The management of contaminants of emerging concern (CECs) in water bodies is particularly challenging due to the difficulty in detection and their recalcitrant degradation by conventional means. In this review, CECs are characterized to give insights into the potential degradation performance of similar compounds. A two-pronged approach was then proposed for the overall management of CECs. Light-driven oxidation processes, namely photo/Fenton, photocatalysis, photolysis, UV/Ozone were discussed. Advances to overcome current limitations in these light-driven processes were proposed, focusing on recent trends and innovations. Light-based detection methodology was also discussed for the management of CECs. Lastly, a cost–benefit analysis on various light-based processes was conducted to access the suitability for CECs degradation. It was found that the UV/Ozone process might not be suitable due to the complication with pH adjustments and limited light wavelength. It was found that EEO values were in this sequence: UV only > UV/combination > photocatalyst > UV/O3 > UV/Fenton > solar/Fenton. The solar/Fenton process has the least computed EEO < 5 kWh m−3 and great potential for further development. Newer innovations such as solar/catalyst can also be explored with potentially lower EEO values.

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Zhang, Li Quan. "Obstacle Impact on the UV-Light Atmospheric Transmission Characteristics". Applied Mechanics and Materials 321-324 (czerwiec 2013): 507–12. http://dx.doi.org/10.4028/www.scientific.net/amm.321-324.507.

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In order to further understand the transmission characteristics of UV-light signal, this paper, based on the algorithmic model of Monte Carlo method of UV-light non-line-of-sight transmission, conducts the simulation analysis of the obstacle impact on UV-light signal transmission characteristics in the atmosphere. The results show that due to the presence of obstacle, the blind region of detection appears; this blind region is related to the distance of the obstacle, as well as to transmission elevation angle, receiving elevation angle and obstacle height of obstacle. The obstacle exerts a slight influence on energy intensity, but just its height changes the range of blind region detection. The transmission elevation angle and the receiving elevation angle, in case of the presence or absence of the obstacle, have two energy distribution peaks which change to some extent, and the energy attenuation is more significant in case of the absence of the obstacle.

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Fan, Zenghui, Ao Shen, Yong Xia i Chengyuan Dong. "Amorphous InGaZnO Thin-Film Transistors with Double-Stacked Channel Layers for Ultraviolet Light Detection". Micromachines 13, nr 12 (28.11.2022): 2099. http://dx.doi.org/10.3390/mi13122099.

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Amorphous InGaZnO thin film transistors (a-IGZO TFTs) with double-stacked channel layers (DSCL) were quite fit for ultraviolet (UV) light detection, where the best DSCL was prepared by the depositions of oxygen-rich (OR) IGZO followed by the oxygen-deficient (OD) IGZO films. We investigated the influences of oxygen partial pressure (PO) for DSCL-TFTs on their sensing abilities by experiments as well as Technology Computer Aided Design (TCAD) simulations. With the increase in PO values for the DSCL depositions, the sensing parameters, including photogenerated current (Iphoto), sensitivity (S), responsivity (R), and detectivity (D*) of the corresponding TFTs, apparently degraded. Compared with PO variations for the OR-IGZO films, those for the OD-IGZO depositions more strongly influenced the sensing performances of the DSCL-TFT UV light detectors. The TCAD simulations showed that the variations of the electron concentrations (or oxygen vacancy (VO) density) with PO values under UV light illuminations might account for these experimental results. Finally, some design guidelines for DSCL-TFT UV light detectors were proposed, which might benefit the potential applications of these novel semiconductor devices.

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Yuan, Shuo-Huang, Zingway Pei, Hsin-Cheng Lai, Chien-Hsun Chen, Pei-Wen Li i Yi-Jen Chan. "Au Nanoparticle Light Scattering Enhanced Responsivity in Pentacene Phototransistor for Deep-UV Light Detection". IEEE Electron Device Letters 36, nr 11 (listopad 2015): 1186–88. http://dx.doi.org/10.1109/led.2015.2479239.

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Guadix, Javier Tapia. "Seeing Is Believing ! : Near-UV Light Detection Mode with GC D-Light ® Pro". Smile Dental Journal 12, nr 1 (marzec 2017): 34–36. http://dx.doi.org/10.12816/0038694.

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Khan, Sulaiman, David Newport i Stéphane Le Calvé. "Development of a Toluene Detector Based on Deep UV Absorption Spectrophotometry Using Glass and Aluminum Capillary Tube Gas Cells with a LED Source". Micromachines 10, nr 3 (18.03.2019): 193. http://dx.doi.org/10.3390/mi10030193.

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A simple deep-ultraviolet (UV) absorption spectrophotometer based on ultraviolet light-emitting diode (UV LED) was developed for the detection of air-borne toluene with a good sensitivity. A fiber-coupled deep UV-LED was employed as a light source, and a spectrometer was used as a detector with a gas cell in between. 3D printed opto-fluidics connectors were designed to integrate the gas flow with UV light. Two types of hollow core waveguides (HCW) were tested as gas cells: a glass capillary tube with aluminum-coated inner walls and an aluminum capillary tube. The setup was tested for different toluene concentrations (10–100 ppm), and a linear relationship was observed with sensitivities of 0.20 mA·U/ppm and 0.32 mA·U/ppm for the glass and aluminum HCWs, respectively. The corresponding limits of detection were found to be 8.1 ppm and 12.4 ppm, respectively.

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Zhang, Zhaojun, Wei Zheng, Richeng Lin i Feng Huang. "High-sensitive and fast response to 255 nm deep-UV light of CH 3 NH 3 PbX 3 (X = Cl, Br, I) bulk crystals". Royal Society Open Science 5, nr 9 (wrzesień 2018): 180905. http://dx.doi.org/10.1098/rsos.180905.

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Deep-UV light detection has important application in surveillance and homeland security regions. CH 3 NH 3 PbX 3 (X = Cl, Br, I) materials have outstanding optical absorption and electronic transport properties suitable for obtaining excellent deep-UV photoresponse. In this work, we have grown high-quality CH 3 NH 3 PbX 3 (X = Cl, Br, I) bulk crystals and used them to fabricate photodetectors. We found that they all have high-sensitive and fast-speed response to 255 nm deep-UV light. Their responsivities are 10–10 3 times higher than MgZnO and Ga 2 O 3 detectors, and their response speeds are 10 3 times faster than Ga 2 O 3 and ZnO detectors. These results indicate a new promising route for deep-UV detection.

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Elfakir, C., M. Lafosse i M. Dreux. "Optimization of high-performance liquid chromatographic analysis with UV detection: light-scattering detection to estalish the coelution of UV- and non-UV-absorbing constituents". Journal of Chromatography A 513 (styczeń 1990): 354–59. http://dx.doi.org/10.1016/s0021-9673(01)89455-3.

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Jiang, Lianzhong, Jieyun Wu, Qing Li, Guowei Deng, Xiaoling Zhang, Zhonghui Li, Kaixin Chen i Kin Seng Chiang. "A photochromic dye doped polymeric Mach–Zehnder interferometer for UV light detection". Journal of Materials Chemistry C 7, nr 21 (2019): 6257–65. http://dx.doi.org/10.1039/c9tc00749k.

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Karaduman, Irmak, Mehmet Demir, Dilber Esra Yıldız i Selim Acar. "CO2gas detection properties of a TIO2/Al2O3heterostructure under UV light irradiation". Physica Scripta 90, nr 5 (2.04.2015): 055802. http://dx.doi.org/10.1088/0031-8949/90/5/055802.

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Magill, S., M. Nayfeh, M. Fizari, J. Malloy, Y. Maximenko, J. Xie i H. Yu. "Enhanced UV light detection using wavelength-shifting properties of Silicon nanoparticles". Journal of Instrumentation 10, nr 05 (15.05.2015): P05008. http://dx.doi.org/10.1088/1748-0221/10/05/p05008.

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Shahi, Praveen Kumar, A. K. Singh, S. B. Rai i Bruno Ullrich. "Lanthanide complexes for temperature sensing, UV light detection, and laser applications". Sensors and Actuators A: Physical 222 (luty 2015): 255–61. http://dx.doi.org/10.1016/j.sna.2014.12.021.

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Bian, Lifang, Huili Ma, Wenpeng Ye, Anqi Lv, He Wang, Wenyong Jia, Long Gu, Huifang Shi, Zhongfu An i Wei Huang. "Color-tunable ultralong organic phosphorescence materials for visual UV-light detection". Science China Chemistry 63, nr 10 (26.05.2020): 1443–48. http://dx.doi.org/10.1007/s11426-020-9761-x.

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Smulko, Janusz, Tomasz Chludziński, Umut Çindemir, Claes G. Granqvist i He Wen. "UV Light-Modulated Fluctuation-Enhanced Gas Sensing by Layers of Graphene Flakes/TiO2 Nanoparticles". Journal of Sensors 2020 (8.07.2020): 1–9. http://dx.doi.org/10.1155/2020/5890402.

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We present experimental results of fluctuation-enhanced gas sensing by low-cost resistive sensors made of a mixture of graphene flakes and TiO2 nanoparticles. Both components are photocatalytic and activated by UV light. Two UV LEDs of different wavelengths (362 and 394 nm) were applied to modulate the gas sensing of the layers. Resistance noise was recorded at low frequencies, between 8 Hz and 10 kHz. The sensors’ response was observed in an ambient atmosphere of synthetic air and toxic NO2 at selected concentrations (5, 10, and 15 ppm). We observed that flicker noise changed its frequency dependence at different UV light wavelengths, thereby providing additional information about the ambient atmosphere. The power spectral density changed by a few times as a result of UV light irradiation. The sensors were operated at 60 and 120°C, and the effect of UV light on gas sensing was most apparent at low operating temperature. We conclude that UV light activates the gas-sensing layer and improves gas detection at low concentrations of NO2. This result is desirable for the detection of the components of gas mixtures, and the modulated sensor can replace an array of independent resistive sensors which would consume much more energy for heating. We also suggest that a more advanced technology for preparing the gas-sensing layer, by use of spin coating, will produce corresponding layers with thickness of about a few μm, which is about ten times less than that for the tested samples. The effects induced by the applied UV light, having a penetration depth of only a few μm, would then be amplified.

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Park, Tu San, Soohee Cho, Tigran G. Nahapetian i Jeong-Yeol Yoon. "Smartphone Detection of UV LED-Enhanced Particle Immunoassay on Paper Microfluidics". SLAS TECHNOLOGY: Translating Life Sciences Innovation 22, nr 1 (10.07.2016): 7–12. http://dx.doi.org/10.1177/2211068216639566.

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Use of a smartphone as an optical detector for paper microfluidic devices has recently gained substantial attention due to its simplicity, ease of use, and handheld capability. Utilization of a UV light source enhances the optical signal intensities, especially for the particle immunoagglutination assay that has typically used visible or ambient light. Such enhancement is essential for true assimilation of assays to field deployable and point-of-care applications by greatly reducing the effects by independent environmental factors. This work is the first demonstration of using a UV LED (UVA) to enhance the Mie scatter signals from the particle immunoagglutination assay on the paper microfluidic devices and subsequent smartphone detection. Smartphone’s CMOS camera can recognize the UVA scatter from the paper microfluidic channels efficiently in its green channel. For an Escherichia coli assay, the normalized signal intensities increased up to 50% from the negative signal with UV LED, compared with the 4% to 7% with ambient light. Detection limit was 10 colony-forming units/mL. Similar results were obtained in the presence of 10% human whole blood.

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Dong, Tian, Jian Hua Tong, Chao Bian, Jizhou Sun Sun i Shan Hong Xia. "Thermal Assisted UV Digestion Utilizing Nano-TiO₂ Photocatalyst for the Detection of Total Phosphorous". Key Engineering Materials 562-565 (lipiec 2013): 964–69. http://dx.doi.org/10.4028/www.scientific.net/kem.562-565.964.

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This work presents a novel thermal assisted ultra-violet (UV) photocatalysis oxidation method for total phosphorus (TP) detection. A 365nm wavelength UV light was used as the UV light source, and the TiO2 particles, immobilized on silicon wafer, were used as the catalyst. The sodium glycerophosphate was digested as the typical compound of TP. The digested samples were determined by spectrophotometry after the phosphomolybdenum blue reaction. The catalyst can be used repetitively with long-term stability in this work. For the photocatalysis digestion process under room-temperature, when the reaction time reached 120min, the conversion rates were 92.31% and 93.66% for 1mg/L and 4mg/L of C3H7Na2O6P solutions, respectively. And conversion rates were 95.48% and 99.37% respectively for thermal assisted ultra-violet (UV) photocatalysis digestion process at the condition of 30min and 60°C. Compared with the conventional thermal digestion method and photocatalysis digestion method for TP detection, this thermal assisted UV digestion method can greatly decrease the digestion time and enhance the efficiency.

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NGUYEN, Van Son, Véronique JUBERA, Alain GARCIA, Claude LUCAT i Hélène DEBEDA. "Towards hydrogen detection at room temperature with printed ZnO nanoceramics films activated with halogen light". Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2015, CICMT (1.09.2015): 000224–29. http://dx.doi.org/10.4071/cicmt-wp13.

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Though semiconducting properties of ZnO have been extensively investigated under hazardous gases, research is still necessary for low-cost sensors working at room temperature. Study of printed ZnO nanopowders based-sensor has been undertaken for hydrogen detection. A ZnO paste made with commercial nanopowders is deposited on interdigitated Pt electrodes and sintered at 400°C. ZnO layer structure and morphology are first examined by XRD, SEM and emission/excitation spectra prior to the study of the effect of UV-light on the electrical conduction of the semiconductor oxide. Then, the response to hydrogen shows that low UV-light provided by a halogen light enhances gas sensitivity and allows detection at room temperature with sensitivity equivalent to those obtained in dark condition at 150°C. A sensitivity S≈44% is obtained for 300 ppm hydrogen at room temperature under halogen lamp illumination whereas a sensitivity S≈38% is measured at 150°C in the dark. Moreover, it is demonstrated that very low UV-light power (15 μW/mm2) provided by the halogen lamp is sufficient to give sensitivities as high as those obtained with UV LED (7.7 mW/mm2). These results are comparable to those obtained for 1 or 2D ZnO nanostructures working at room temperature or at temperature until 250 °C.

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Wang, Cheng-Jyun, Hsin-Chiang You, Jen-Hung Ou, Yun-Yi Chu i Fu-Hsiang Ko. "Ultraviolet Photodetecting and Plasmon-to-Electric Conversion of Controlled Inkjet-Printing Thin-Film Transistors". Nanomaterials 10, nr 3 (4.03.2020): 458. http://dx.doi.org/10.3390/nano10030458.

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Direct ink-jet printing of a zinc-oxide-based thin-film transistor (ZnO-based TFT) with a three-dimensional (3-D) channel structure was demonstrated for ultraviolet light (UV) and visible light photodetection. Here, we demonstrated the channel structures by which temperature-induced Marangoni flow can be used to narrow the channel width from 318.9 ± 44.1 μm to 180.1 ± 13.9 μm via a temperature gradient. Furthermore, a simple and efficient oxygen plasma treatment was used to enhance the electrical characteristics of switching ION/IOFF ratio of approximately 105. Therefore, the stable and excellent gate bias-controlled photo-transistors were fabricated and characterized in detail for ultraviolet (UV) and visible light sensing. The photodetector exhibited a superior photoresponse with a significant increase of more than 2 orders of magnitude larger drain current generated upon UV illumination. The results could be useful for the development of UV photodetectors by the direct-patterning ink-jet printing technique. Additionally, we also have successfully demonstrated that a metal-semiconductor junction structure that enables plasmon energy detection by using the plasmonic effects is an efficient conversion of plasmon energy to an electrical signal. The device showed a significant variations negative shift of threshold voltage under different light power density with exposure of visible light. With the ZnO-based TFTs, only ultraviolet light detection extends to the visible light wavelength.

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Arnold, Bradley R., Christopher E. Cooper, Michael R. Matrona, Darren K. Emge i Jeffrey B. Oleske. "Stand-off deep-UV Raman spectroscopy". Canadian Journal of Chemistry 96, nr 7 (lipiec 2018): 614–20. http://dx.doi.org/10.1139/cjc-2017-0678.

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UV Raman spectra were measured using a novel experimental configuration. This configuration allows many of the difficulties associated with UV excitation and high-power pulsed laser sources to be mitigated. Large sample areas are imaged into the detection system allowing high power excitation sources to be used while simultaneously avoiding sample degradation and multi-photon absorption effects. Such large detection areas allow large numbers of molecular scatters to be probed even with minimal penetration depth. Alignment issues between sample and collection optics are also simplified. Several common solvents were studied using 213 nm light and their spectra reported.

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Shang, Shi Guang, Ke Wei Xu, Ling Zhao i Feng Tao He. "Fabrication and Ultraviolet Detection Properties of Zinc Oxide by Oxidizing Metallic Zinc at High Temperature". Advanced Materials Research 502 (kwiecień 2012): 258–63. http://dx.doi.org/10.4028/www.scientific.net/amr.502.258.

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Zinc oxide (ZnO) nanocrystalline with different morphologies, used in ultraviolet (UV) light detection, was successfully fabricated by directly oxidizing metallic zinc at high temperature. X-ray diffraction spectra show that the as-prepared samples are hexagonal wurtzite structure. Scanning electron microscopy images indicate that ZnO with different morphologies such as comb-like, tetrapod and bullet structures could be controlled by simply variables like gas flow rate, ambient pressure and growth temperature. The Photoluminescence (PL) spectra were employed to reveal native point defects in ZnO nanocrystalline. The UV detection properties of ZnO nanocrystalline films screen-printed on interdigital electrodes were investigated by observing the changes of capacitance and conductance under different light sources. The results indicate that the comb-like ZnO nanocrystalline has high UV sensitivity.

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Kelly P, Kearse. "Environmental influence on blood serum detection using ultraviolet 365". Journal of Forensic Science and Research 5, nr 1 (26.03.2021): 030–36. http://dx.doi.org/10.29328/journal.jfsr.1001024.

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The major use of alternative light sources (ALS) in the evaluation of bloodstains has been primarily focused on detection of whole blood, with relatively little attention to visualization of blood serum. Serum may become separated from blood pools during clotting, and because it is relatively invisible on certain backgrounds, go undetected by a perpetrator attempting to clean up a crime scene. Recently, Ultraviolet 365 (UV 365) was shown to be an effective tool in blood evaluation, useful for detection of even minute quantities of blood serum. Here the effects of environmental conditions on blood serum stain appearance were evaluated, including temperature, pH, protease sensitivity, solubility, and aging. Interestingly, it was found that the UV fluorescence of serum increases upon exposure to heat, which was accompanied by color changes under visible light and decreased solubility in multiple solvents. The efficiency of visualization of serum stains was somewhat variable, depending on the type of material on which it was dried. Finally, the current study documents the effect of heating on formation of fluorescent serum halo rings in dried bloodstains. Taken together, these data demonstrate that blood serum detection may be affected by certain conditions that influence its visualization under both visible and UV light.

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Wang, Fei, Yang Qiu, Bing-Jie Wang, Hua-Lin Wang i Yi-Tao Long. "Green method to fabricate porous microspheres for ultrasensitive SERS detection using UV light". RSC Advances 6, nr 102 (2016): 100519–25. http://dx.doi.org/10.1039/c6ra17820k.

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Gonzalez, Oriol, Sergio Roso, Xavier Vilanova i Eduard Llobet. "Enhanced detection of nitrogen dioxide via combined heating and pulsed UV operation of indium oxide nano-octahedra". Beilstein Journal of Nanotechnology 7 (25.10.2016): 1507–18. http://dx.doi.org/10.3762/bjnano.7.144.

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We report on the use of combined heating and pulsed UV light activation of indium oxide gas sensors for enhancing their performance in the detection of nitrogen dioxide in air. Indium oxide nano-octahedra were synthesized at high temperature (900 °C) via vapour-phase transport and screen-printed onto alumina transducers that comprised interdigitated electrodes and a heating resistor. Compared to the standard, constant temperature operation of the sensor, mild heating (e.g., 100 °C) together with pulsed UV light irradiation employing a commercially available, 325 nm UV diode (square, 1 min period, 15 mA drive current signal), results in an up to 80-fold enhancement in sensitivity to nitrogen dioxide. Furthermore, this combined operation method allows for making savings in power consumption that range from 35% to over 80%. These results are achieved by exploiting the dynamics of sensor response under pulsed UV light, which convey important information for the quantitative analysis of nitrogen dioxide.

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Liu, Jiaxin, Shalong Wang, Kai Liu, Liqun Ming, Yousheng Zou, Zhengfeng Zhu, Yuhang Dong i in. "Highly sensitive detection and imaging of ultraviolet-B light for precisely controlling vitamin D generation in the human body". Journal of Materials Chemistry C 7, nr 15 (2019): 4503–8. http://dx.doi.org/10.1039/c9tc00479c.

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A highly sensitive photodetector with selective response to UV-B photons in air is firstly demonstrated in this work. The quite low noise current of ∼2 × 10⁻¹⁴ A Hz^−1/2 allows an accurate detection of UV-B photons of 31.8 nW cm⁻² intensity with detectivity of >4 × 10¹⁴ Jones. All the figures of merit in our PDs show promising potential in quantitative detection of UV-B for precisely controlling vitamin D generation.

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Zheng, Youbin, Jieyun Wu, Shiwei Qu, Guowei Deng, Zhonghui Li, Kang Sun, Lianzhong Jiang, Kaixin Chen i Jingdong Luo. "Photo-bleaching of optical waveguide polymers with dipolar chromophores to improve their sensitivity for explosive vapor detection". Journal of Materials Chemistry C 8, nr 37 (2020): 13010–18. http://dx.doi.org/10.1039/d0tc02700f.

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UV light bleaching of chromophore-containing polycarbonate is employed to optimize the waveguide evanescent field in Mach–Zehnder interferometer. It significantly improves the light–analyte interaction for nitrobenzene explosive vapor detection.

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Amorim, Cleber A., Kate C. Blanco, Ivani M. Costa, Estácio P. de Araújo, Adryelle do Nascimento Arantes, Jonas Contiero i Adenilson J. Chiquito. "A New Possibility for Fermentation Monitoring by Electrical Driven Sensing of Ultraviolet Light and Glucose". Biosensors 10, nr 8 (12.08.2020): 97. http://dx.doi.org/10.3390/bios10080097.

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Industrial fermentation generates products through microbial growth associated with the consumption of substrates. The efficiency of industrial production of high commercial value microbial products such as ethanol from glucose (GLU) is dependent on bacterial contamination. Controlling the sugar conversion into products as well as the sterility of the fermentation process are objectives to be considered here by studying GLU and ultraviolet light (UV) sensors. In this work, we present two different approaches of SnO2 nanowires grown by the Vapor–Liquid–Solid (VLS) method. In the GLU sensor, we use SnO2 nanowires as active electrodes, while for the UV sensor, a nanowire film was built for detection. The results showed a wide range of GLU sensing and as well as a significant influence of UV in the electrical signal. The effect of a wide range of GLU concentrations on the responsiveness of the sensor through current–voltage based on SnO2 nanowire films under different concentration conditions ranging was verified from 1 to 1000 mmol. UV sensors show a typical amperometric response of SnO2 nanowires under the excitation of UV and GLU in ten cycles of 300 s with 1.0 V observing a stable and reliable amperometric response. GLU and UV sensors proved to have a promising potential for detection and to control the conversion of a substrate into a product by GLU control and decontamination by UV control in industrial fermentation systems.

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Zagst, Holger, Sophie Hartung, Dina-Mareike Menges, Antonia Wittmann i Hermann Wätzig. "Capillary Zone Electrophoresis with Light-Emitting Diode-Induced Fluorescence Detection for the Analysis of Monoclonal Antibodies: Detector Optimization through Design of Experiments and Comparison to UV Detection". Separations 10, nr 5 (21.05.2023): 320. http://dx.doi.org/10.3390/separations10050320.

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Capillary zone electrophoresis (CZE) is an important technique for the analysis of monoclonal antibodies (mAbs). A recently released light-emitting diode (LED)-induced fluorescence (LEDIF) detector equipped with a 275 nm LED for the detection of proteins through their native fluorescence was used in this study and compared to results obtained using the predominant detection mode, the measurement of the absorption of ultraviolet light (UV detection). This was accomplished using an established CZE method for the analysis of three mAbs: NISTmAb, matuzumab, and Intact Mass Check Standard (Waters). For this purpose, the detector’s settings were first optimized using a design of experiments approach. Three factors, rise time, photomultiplier high voltage supply, and acquisition frequency, were optimized by means of a D-optimal design. The optimal settings were then used for the investigation of signal-to-noise ratios (S/Ns), linearity, and precision. LEDIF detection offered a similar separation quality, up to 12 times higher S/Ns, and lower limits of detection compared to UV detection. Repeatability was excellent, with relative standard deviations (RSDs) of approximately 1% for percentage areas. For intermediate precision, RSDs of <2% (n = 3 × 10) were typically achieved. Overall, LEDIF detection was found to be an excellent and easily optimizable alternative to UV detection.

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Harjunowibowo, Dewanto, Sri Hartati i Aris Budianto. "A Counterfeit Paper Currency Recognition System Using LVQ based on UV Light". IJID (International Journal on Informatics for Development) 1, nr 2 (15.12.2012): 9. http://dx.doi.org/10.14421/ijid.2012.01202.

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This research is aimed to test a paper currency counterfeit detection system based on Linear Vector Quantization (LVQ) Neural Network. The input image of the system is the dancer object image of paper currency Rp. 50.000,- fluorescent by ultraviolet light. The image of paper currency data was taken from conventional banks. The LVQ method is used to recognize whether the paper currency being tested is counterfeit or not. The coding was carried out using visual programming language. The feature size of the dancer tested object is 114x90 px and the RGBHSI was extracted as the input for LVQ. The experimental results show that the system has an accuracy 100% of detecting 20 real test case data, and 96% of detecting 22 simulated test case data. The simulated case data was generated by varying the brightness of the image data. The real test case data contains of 10 counterfeit paper currency and 10 original paper currency. The simulated case data contains of 11 original paper currency and 11 counterfeit paper currency. The best setting for the system is Learning Rate = 0.01 and MaxEpoh = 10.

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Chrząszcz, Jerzy. "Using Off-the-Shelf Graphic Design Software for Validating the Operation of an Image Processing System". Sensors 21, nr 15 (28.07.2021): 5104. http://dx.doi.org/10.3390/s21155104.

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Fluorescent markers are widely used to protect banknotes, passports, and other documents. Verification of such documents relies upon visual assessment of the markers revealed by ultraviolet (UV) radiation. However, such an explicit approach is inappropriate in certain circumstances, e.g., when discretely checking people for marks left by a pepper gel thrower. The UV light and fluorescent light must not be visible in such applications, yet reliable detection of the markers must still be performed. This problem was successfully resolved using TRIZ methodology, which led to a patent application. The main idea of the solution is to use low-intensity time-variable UV light for illuminating an object and process the image of the object acquired by a camera to detect colour changes too small to be noticed with the naked eye. This paper describes how popular graphics editors such as Adobe Photoshop Elements were used to validate the system concept devised. Simulation experiments used images taken in both visible and UV light to assess the effectiveness and perceptibility of the detection process. The advantage of such validation comes from using commodity software and performing the experiments without access to a laboratory and without physical samples, which makes this approach especially suitable in pandemic times.

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