Optical waveguide modeling of refractive index mediated pH responses in silica nanocomposite thin film based fiber optic sensors

2016 ◽  
Vol 119 (6) ◽  
pp. 064502 ◽  
Author(s):  
P. R. Ohodnicki ◽  
C. Wang
Keyword(s):  
Thin Film ◽  
Refractive Index ◽  
Optical Waveguide ◽  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Nanocomposite Thin Film ◽  
Silica Nanocomposite

Plasmonic nanocomposite thin film enabled fiber optic sensors for simultaneous gas and temperature sensing at extreme temperatures

Nanoscale ◽  
2013 ◽  
Vol 5 (19) ◽  
pp. 9030 ◽  
Author(s):  
Paul R. Ohodnicki ◽  
Michael P. Buric ◽  
Thomas D. Brown ◽  
Christopher Matranga ◽  
Congjun Wang ◽  
...  
Keyword(s):  
Thin Film ◽  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Temperature Sensing ◽  
Extreme Temperatures ◽  
Nanocomposite Thin Film ◽  
Plasmonic Nanocomposite

scholarly journals Doped Nanocrystalline Diamond Films as Reflective Layers for Fiber-Optic Sensors of Refractive Index of Liquids

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2124 ◽  
Author(s):  
Monika Kosowska ◽  
Daria Majchrowicz ◽  
Kamatchi J. Sankaran ◽  
Mateusz Ficek ◽  
Ken Haenen ◽  
...  
Keyword(s):  
Refractive Index ◽  
Fiber Optic ◽  
Microwave Plasma ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Fiber Optic Sensors ◽  
Nanocrystalline Diamond ◽  
Silicon Substrates ◽  
Boron Doped ◽  
Interferometric Sensor

This paper reports the application of doped nanocrystalline diamond (NCD) films—nitrogen-doped NCD and boron-doped NCD—as reflective surfaces in an interferometric sensor of refractive index dedicated to the measurements of liquids. The sensor is constructed as a Fabry–Pérot interferometer, working in the reflective mode. The diamond films were deposited on silicon substrates by a microwave plasma enhanced chemical vapor deposition system. The measurements of refractive indices of liquids were carried out in the range of 1.3 to 1.6. The results of initial investigations show that doped NCD films can be successfully used in fiber-optic sensors of refractive index providing linear work characteristics. Their application can prolong the lifespan of the measurement head and open the way to measure biomedical samples and aggressive chemicals.

scholarly journals Distributed fiber optic radiation sensors

2021 ◽  
Vol 1 ◽  
pp. 15-16
Author(s):  
Aleksander Wosniok ◽  
Katerina Krebber
Keyword(s):  
Refractive Index ◽  
Real Time ◽  
Optical Fibers ◽  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Radiation Monitoring ◽  
High Radiation ◽  
Fiber Core ◽  
Radiation Induced ◽  
Radiation Sensors

Abstract. The international research efforts focused on the development of radiation sensors based on optic fibers have their origins in the 1970s (Evans et al., 1978). Generally, the lightweight fiber optic sensors are immune to electromagnetic field interference and high voltages making them deployable in harsh environments at hard to reach areas where conventional sensors usually will not work at all. A further advantage of such radiation sensors is the possibility of remote and real-time monitoring (Huston et al., 2001). In this work, we present our results achieved in several research activities for development of fiber optic dosimeters. The findings show that both the measurement of the radiation-induced attenuation (RIA) along the entire sensing fiber and the accompanying change in the refractive index of the fiber core can be used for distributed radiation monitoring in the kGy and MGy range, respectively. Depending on the fiber type and material the RIA shows varying response to dose rates, environmental temperatures and the wavelength of the laser source used. Thereby, an operation with visible laser light provides most favorable performance in terms of high radiation sensitivity. Operating at these wavelengths, RIA monitoring could yield high-sensitivity dose measurement with sub-gray resolution and accuracy (Stajanca and Krebber, 2017b); however, conventional optical time-domain reflectometry (OTDR) systems for RIA measurements operating in the visible range suffer from low-spatial resolution, long measurement times and poor signal-to-noise (SNR) ratio. The limitations of the OTDR performance can be overcome by the incoherent optical frequency domain reflectometry (I-OFDR) developed by the Federal Institute of Materials Research and Testing (BAM, Liehr et al., 2009) with potential for dynamic real-time measurement. Over the years, several highly radiation sensitive fibers, such as perfluorinated polymer optical fibers (PF-POF, Stajanca and Krebber, 2017a), phosphorous-doped silica optical fibers (SOF, Paul et al., 2009), aluminium-doped SOF (Faustov et al., 2013) and erbium-doped SOF (Wosniok et al., 2016) have been identified and are commercially available. As mentioned before, the radiation-induced RIA increase is associated with an increase in the refractive index leading also to material compaction in the fiber core. The latter two effects can be used for measuring radiation distribution based on Brillouin scattering in the range of high radiation doses of several MGy (Phéron et al., 2012; Wosniok et al., 2016). When using fiber optic sensors for radiation monitoring, the existing post-irradiation annealing behavior of the optical fiber sensors must also be considered.

Compact Fiber Optic Sensors for Dual Temperature and Refractive Index Profiling Based on Partially Etched Chirped Fiber Bragg Grating

2018 ◽  
Author(s):  
Sanzhar Korganbayev ◽  
Aliya Bekmurzayeva ◽  
Madina Shaimerdenova ◽  
Takhmina Ayunova ◽  
Carlo Molardi ◽  
...  
Keyword(s):  
Refractive Index ◽  
Fiber Bragg Grating ◽  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Bragg Grating ◽  
Chirped Fiber Bragg Grating

scholarly journals Fiber optic microsphere with ZnO thin film for potential application in refractive index sensor – theoretical study

2018 ◽  
Vol 10 (3) ◽  
pp. 85 ◽  
Author(s):  
Marzena Hirsch
Keyword(s):  
Thin Film ◽  
Refractive Index ◽  
Optical Fiber ◽  
Fiber Optic ◽  
Refractive Index Sensor ◽  
Zno Thin Film ◽  
Sensors And Actuators ◽  
Low Coherence ◽  
Refractive Index Sensing ◽  
Fabry Perot

Optical fiber sensors of refractive index play important role in analysis of biological and chemical samples. This work presents a theoretical investigation of a spectral response of fiber optic microsphere with zinc-oxide (ZnO) thin film deposited on the surface and evaluates the prospect of using such structure for refractive index sensing. Microsphere is fabricated by optical fiber tapering method on the base of a single mode fiber. A numerical model is described and simulation was conducted to assess the influence of the ZnO layer deposition on a reflected signal. The results indicate that ZnO film improves the performance in terms of a potential application in refractive index sensor. Full Text: PDF ReferencesY. Qian, Y. Zhao, Q. Wu, Y. Yang, Review of salinity measurement technology based on optical fiber sensor, Sensors and Actuators B: Chemical, 260, 86–105 (2018). CrossRef M. Jędrzejewska-Szczerska, Response of a New Low-Coherence Fabry-Pérot Sensor to Hematocrit Levels in Human Blood, Sensors, 14, 4, 6965–6976, (2014). CrossRef F. Sequeira et al., Refractive Index Sensing with D-Shaped Plastic Optical Fibers for Chemical and Biochemical Applications, Sensors, 16, 12, 2119, (2016). CrossRef M. Jędrzejewska-Szczerska et al., ALD thin ZnO layer as an active medium in a fiber-optic Fabry–Pérot interferometer, Sensors and Actuators A: Physical, 221, 88–94, (2015). CrossRef M. Hirsch, D. Majchrowicz, P. Wierzba, M. Weber, M. Bechelany, M. Jędrzejewska-Szczerska, Low-Coherence Interferometric Fiber-Optic Sensors with Potential Applications as Biosensors, Sensors, 17, 2, 261, (2017). CrossRef M. Hirsch, P. Wierzba, M. Jędrzejewska-Szczerska, Application of thin dielectric films in low coherence fiber-optic Fabry-Pérot sensing interferometers: comparative study, Proc. SPIE 10161, 101610D (2016). CrossRef J. Pluciński, K. Karpienko, Fiber optic Fabry-Pérot sensors: modeling versus measurements results, Proc. SPIE 10034, 100340H (2016). CrossRef F. Goldsmith, Quasioptical systems: Gaussian beam quasioptical propagation and applications. (Piscataway, NJ: IEEE Press 1998). CrossRef

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