Journal
JOURNAL OF OPTICAL TECHNOLOGY
Volume 88, Issue 2, Pages 100-105Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOT.88.000100
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Funding
- 111 Project [D17021]
- National Natural Science Foundation of China [51775051]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT_16R07]
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The all-fiber dual-parameter sensor proposed in this study is based on a cascaded tilted grating and a Bragg grating, allowing for simultaneous measurement of temperature and refractive index. By decoupling the temperature and refractive index sensitivities, the sensor sensitivity matrix can be obtained.
An all-fiber dual-parameter sensor based on a cascaded tilted grating and a Bragg grating for temperature and refractive index measurement is proposed. Both fiber Bragg gratings and tilted Bragg gratings are sensitive to temperature, but fiber Bragg gratings are not sensitive to the refractive index. Therefore, through decoupling the cross sensitivity of the temperature and refractive index, the sensor sensitivity matrix can be obtained. In the temperature range of 25 degrees C-300 degrees C, the temperature sensitivities are 11.60 pm/degrees C for the fiber Bragg grating and 11.25 pm/degrees C for the tilted Bragg grating. NaCl solutions with concentrations from 5% to 20% are used for the refractive index test, and the refractive index sensitivity is 0.833 nm/RIU for the tilted Bragg grating. The proposed sensor can be used for dual-parameter measurement, showing good application prospects and research reference value. (C) 2021 Optical Society of America
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