A Sensing Peak Identification Method for Fiber Extrinsic Fabry–Perot Interferometric Refractive Index Sensing

A novel sensing peak identification method for high accuracy refractive index (RI) sensing is proposed. The implementation takes the intensity of interference maximum as the characteristic to distinguish interference peaks, tracking the sensing peak continually during a RI changes, with high measurement accuracy and simple computation. To verify the effect of the method, the extrinsic Fabry–Perot interferometer (EFPI) sensor has been fabricated using the large lateral offset splicing technique. In the RI range from 1.346 to 1.388, the measurement range of the EFPI with the proposed method reaches at least 6 times larger than that of EFPI with the wavelength tracking method and the largest measurement error is −4.47 × 10−4. The EFPI refractive index (RI) sensor identified the sensing peak is believed to play an important role in RI, concentration and density sensing, etc., for superior performance.

Download Full-text

Optic Method to Measure the Density of Gas and the Analysis on Uncertainty of Measurement

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.361-363.226 ◽

2011 ◽

Vol 361-363 ◽

pp. 226-231

Author(s):

Chang Li Guo ◽

Yan Qing Zhang

Keyword(s):

Refractive Index ◽

Measurement Accuracy ◽

Uncertainty Of Measurement ◽

Interference Theory ◽

Interference Fringes ◽

Air Chamber ◽

High Measurement ◽

Wedge Structure ◽

High Measurement Accuracy ◽

Optical Wedge

A optic method to measure the density of gas is put forward. That is, by using the optical Wedge structure to build air chamber and chamber for gas under test, and by measuring the differences of the optical Wedge interference fringes of the two rooms, the density of gas has been measured. The interference theory of Wedge has been theoretical analyzed, and a formula which can be used to measure the refractive index of gas is put forward, and the uncertainty of the measurement has been analyzed. The parameters of gas density, refractive index and gas thickness have been used in the formula. The results show that the method of optical Wedge interference is practical, and high measurement accuracy is achievement when the density of gas is high.

Download Full-text

Metal-dielectric-metal multilayer structure with tunable Fabry-Perot resonance for highly sensitive refractive index sensing

Acta Physica Sinica ◽

10.7498/aps.70.20202058 ◽

2021 ◽

Vol 70 (14) ◽

pp. 140702-140702

Author(s):

Zhang Xiang-Yu ◽

◽

Liu Hui-Gang ◽

Kang Ming ◽

Liu Bo ◽

...

Keyword(s):

Refractive Index ◽

Multilayer Structure ◽

Refractive Index Sensing ◽

Highly Sensitive ◽

Fabry Perot

Download Full-text

A Large-Area, Mushroom-Capped Plasmonic Perfect Absorber: Refractive Index Sensing and Fabry-Perot Cavity Mechanism

Advanced Optical Materials ◽

10.1002/adom.201500231 ◽

2015 ◽

Vol 3 (12) ◽

pp. 1779-1786 ◽

Cited By ~ 52

Author(s):

Khagendra Bhattarai ◽

Zahyun Ku ◽

Sinhara Silva ◽

Jiyeon Jeon ◽

Jun Oh Kim ◽

...

Keyword(s):

Refractive Index ◽

Perfect Absorber ◽

Large Area ◽

Refractive Index Sensing ◽

Fabry Perot

Download Full-text

Microfiber-Enabled In-line Fabry–Pérot Interferometer for High-Sensitive Force and Refractive Index Sensing

Journal of Lightwave Technology ◽

10.1109/jlt.2014.2310205 ◽

2014 ◽

Vol 32 (9) ◽

pp. 1682-1688 ◽

Cited By ~ 29

Author(s):

Shecheng Gao ◽

Weigang Zhang ◽

Zhi-Yong Bai ◽

Hao Zhang ◽

Wei Lin ◽

...

Keyword(s):

Refractive Index ◽

Refractive Index Sensing ◽

Fabry Perot

Download Full-text

A microdroplet-etched fiber Fabry-Perot resonator for the refractive index sensing

10.1117/12.2185224 ◽

2015 ◽

Author(s):

Bo Liu ◽

Jie Li ◽

Li-Peng Sun ◽

Mengmei Geng ◽

Yunyun Huang ◽

...

Keyword(s):

Refractive Index ◽

Refractive Index Sensing ◽

Fabry Perot

Download Full-text

Graphene oxide-polymethylmethacrylate polymer waveguide device based on near infrared fingerprint spectrum for refractive index sensing

Transactions of the Institute of Measurement and Control ◽

10.1177/0142331217707364 ◽

2017 ◽

Vol 40 (8) ◽

pp. 2607-2610

Author(s):

Botao Wang ◽

Qi Wang ◽

Lingxin Kong ◽

Riqing Lv

Keyword(s):

Refractive Index ◽

Graphene Oxide ◽

Near Infrared ◽

High Sensitivity ◽

Single Mode ◽

Glycerol Solution ◽

Refractive Index Measurement ◽

Polymer Waveguide ◽

Refractive Index Sensing ◽

High Measurement

A graphene oxide-polymethylmethacrylate (GO-PMMA) microfiber sensor is proposed and experimentally demonstrated in this paper, which is based on the absorption principle of near infrared spectra for external refractive index sensing. The sensor was fabricated by splicing a section of 1 mm GO-PMMA between two tapered single mode fibers. The hydrophilic groups of graphene oxide can be used to measure the proportion of water in glycerol solution, and achieve the goal of refractive index measurement indirectly. Experiments were conducted for moisture content of 4.3%~45% (refractive index range from 1.3400 to 1.4054) in glycerin solution. Different concentrations of glycerol solution have different intensities of absorption peaks near 1530 nm wavelength. The absorption peak power near 1530 nm wavelength responses to the external refractive index was experimentally studied. The results show that the sensor possesses a high sensitivity of 167.39 dB/RIU in the refractive index range of 1.34~1.41 and has a good linearity response to external refractive index. The proposed sensor is attractive owing to its high measurement speed, accurate, no pollution and lower cost, and is suited for long-term online real-time measurement.

Download Full-text

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

Photonics Letters of Poland ◽

10.4302/plp.v10i3.835 ◽

2018 ◽

Vol 10 (3) ◽

pp. 85 ◽

Cited By ~ 4

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

Download Full-text