Simultaneous measurement of refractive index and temperature based on asymmetrical Fabry‐Perot interferometer

Wu, Yue; Lei, Hong; Ye, Guang; Meng, Fanqi; Zhu, Lianqing

doi:10.1002/mop.31879

Cited by 6 publications

(6 citation statements)

References 22 publications

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“…The related research of optical fiber temperature sensing mainly focuses on, for instance, the Mach-Zehnder interferometer [8][9][10], Michelson interferometer [11,12], Fabry-Perot interferometer [13,14], long period grating [15,16], and fiber Bragg grating (FBG) . Although the above-mentioned various sensors can be directly used for temperature measurement, there are some shortcomings.…”

Section: Introductionmentioning

confidence: 99%

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Research on the High Temperature and High Pressure Gold-Plated Fiber Grating Dual-Parameter Sensing Measurement System

et al. 2022

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In electrohydrostatic drive actuators, there is a demand for temperature and pressure monitoring in complex environments. Fiber Bragg grating (FBG) has become a promising sensor for measuring temperature and pressure. However, there is a cross-sensitivity between temperature and pressure. A gold-plated FBG is proposed and manufactured, and an FBG is used as a reference grating to form a parallel all-fiber sensing system, which can realize the simultaneous measurement of pressure and temperature. Based on the simulation software, the mechanical distribution of the pressure diaphragm is analyzed, and the fixation scheme of the sensor is determined. Using the demodulator to monitor the changes in the reflectance spectrum in real-time, the pressure and ambient temperature applied to the sensor are measured. The experimental results show that the temperature sensitivity of gold-plated FBG is 3 times that of quartz FBG, which can effectively distinguish the temperature changes. The pressure response sensitivity of gold-plated FBG is 0.3 nm/MPa, which is same as the quartz FBG. Through the sensitivity matrix equation, the temperature and pressure dual-parameter sensing measurement is realized. The accuracy of the temperature and pressure measurement is 97.7% and 99.0%, and the corresponding response rates are 2.7 ms/°C and 2 ms/MPa, respectively. The sensor has a simple structure and high sensitivity, and it is promising to be applied in health monitoring in complex environments with a high temperature and high pressure.

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Section: Introductionmentioning

confidence: 99%

“…Figure13. The temperature and pressure conditions to be measured based on the spectrum analysis of the sensor probe.…”

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confidence: 99%

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Research on the High Temperature and High Pressure Gold-Plated Fiber Grating Dual-Parameter Sensing Measurement System

et al. 2022

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“…So far, several sensors based on a single platform that are capable of monitoring refractive index and temperature have been proposed in the literature. These include long-period gratings (Hu et al, 2012;Huang et al, 2013;Du et al, 2019;Pang et al, 2020;Shang et al, 2020), tilted fiber Bragg gratings (Wong et al, 2011;Jiang et al, 2017), and Fabry-Perot interferometers with a single cavity (Wang and Wang, 2012;Tan et al, 2014;André et al, 2016;Wu et al, 2019;Flores-Bravo et al, 2021b). Optical fibers coated with a thin gold layer have also been proposed for index and temperature sensing (Xiao et al, 2014;Velázquez-González et al, 2017;Alonso-Murias et al, 2019;Zhang et al, 2021b).…”

Section: Introductionmentioning

confidence: 99%

Dual-Parameter Sensing With a Single Supermode Interferometer

Flores-Bravo

Villatoro

2022

Front. Sens.

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Optical fiber interferometers have intrinsic sensitivity to temperature, thus, in sensing applications; they need a reference temperature sensor or a mechanism to control the temperature. Here, we demonstrate that a single multicore fiber interferometer can monitor two parameters simultaneously; more particularly, refractive index, and temperature. The interferometer is easy to manufacture; a short segment of an optical fiber with seven coupled cores is fusion spliced at the distal end of a conventional single mode optical fiber. In the coupled-core fiber, two supermodes beat; this makes the reflection spectrum of the device to exhibit a well-defined series of maxima and minima. The refractive index of a sample in contact with multicore fiber alters the amplitude of the interference pattern and temperature induces a shift to such a pattern. The changes of the interference pattern are easy to monitor and decode with a low-resolution spectrometer. As an application of our dual-parameter sensor, the thermo-optic coefficient of a sample was measured.

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“…The refractive index sensitivities based on FBG peak and PCF-FP dip in the range of 1.3315–1.3708 are 0 and 9.14 dB/RIU, respectively. In 2019, Yue Wu et al [ 41 ] developed a Fabry–Perot interferometer based on FBG; the fiber sensor has the temperature sensitivity of 9 pm/°C in the range from 10 °C to 70 °C, and refractive index sensitivity is 33.55 dB/RIU in the range from 1.333 to 1.413. However, although these sensors have completed dual-parameter measurement, they still need to optimize the problems of complex structure and small range.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Measurement of Temperature and Refractive Index Using High Temperature Resistant Pure Quartz Grating Based on Femtosecond Laser and HF Etching

et al. 2021

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The optical fiber temperature and refractive index sensor combined with the hollow needle structure for medical treatment can promote the standardization of traditional acupuncture techniques and improve the accuracy of body fluid analysis. A double-parameter sensor based on fiber Bragg grating (FBG) is developed in this paper. The sensor materials are selected through X-ray diffraction (XRD) analysis, and the sensor sensing principle is theoretically analyzed and simulated. Through femtosecond laser writing pure silica fiber, a high temperature resistant wavelength type FBG temperature sensor is obtained, and the FBG is corroded by hydrofluoric acid (HF) to realize a high-sensitivity intensity-type refractive index sensor. Because the light has dual characteristics of energy and wavelength, the sensor can realize simultaneous dual-parameter sensing. The light from the lead-in optical fiber is transmitted to the sensor and affected by temperature and refractive-index; then, the reflection peak is reflected back to the lead-out fiber by the FBG. The high temperature response and the refractive index response of the sensor were measured in the laboratory, and the high temperature characteristics of the sensor were verified in the accredited institute. It is demonstrated that the proposed sensor can achieve temperature sensing up to 1150 °C with the sensitivity of 0.0134 nm/°C, and refractive sensing over a refractive range of 1.333 to 1.4027 with the sensitivity of −49.044 dBm/RIU. The sensor features the advantages of two-parameter measurement, compact structure, and wide temperature range, and it exhibits great potential in acupuncture treatment.

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Simultaneous measurement of refractive index and temperature based on asymmetrical Fabry‐Perot interferometer

Cited by 6 publications

References 22 publications

Research on the High Temperature and High Pressure Gold-Plated Fiber Grating Dual-Parameter Sensing Measurement System

Research on the High Temperature and High Pressure Gold-Plated Fiber Grating Dual-Parameter Sensing Measurement System

Dual-Parameter Sensing With a Single Supermode Interferometer

Simultaneous Measurement of Temperature and Refractive Index Using High Temperature Resistant Pure Quartz Grating Based on Femtosecond Laser and HF Etching

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