Simultaneous measurement of relative humidity and temperature based on internal-external cavity Vernier effect in cascaded Fabry-Pérot interferometer

Cheng Zhou; Jiajun Tian; Yong Yao

doi:10.1117/12.2689102

31 July 2023 Simultaneous measurement of relative humidity and temperature based on internal-external cavity Vernier effect in cascaded Fabry-Pérot interferometer

Cheng Zhou, Jiajun Tian, Yong Yao

Author Affiliations +

Proceedings Volume 12747, Third International Conference on Optics and Image Processing (ICOIP 2023); 127471C (2023) https://doi.org/10.1117/12.2689102
Event: Third International Conference on Optics and Image Processing (ICOIP 2023), 2023, Hangzhou, China

Abstract

A multi-beam interference theory called internal-external cavity Vernier effect in cascaded Fabry–Pérot interferometer (FPI) was proposed and analyzed. Through that theory, simultaneous measurement of relative humidity (RH) and temperature could be achieved. The cascaded FPI consists of an air cavity and a chitosan cavity. The envelope of the spectrum of the proposed sensor can restore the information of the chitosan cavity, and the high frequency fringe is the sum of the information of the two cavities. By tracing the wavelength shifts of the envelope and high-frequency fringes, a sensitivity coefficient (SC) matrix of the relatively humidity (RH) and temperature could be obtained. The experimental RH sensitivities for the envelope and high-frequency fringe were 1.599 nm/%RH and 0.071 nm/%RH, respectively. Temperature sensitivities of -0.045 nm/℃and 0.035/℃ were obtained for the envelope and high-frequency fringe, respectively. The crosstalk between the RH and temperature was eliminated by the SC. This Vernier effect provides a dual-parameter measurement function and explains the multi-beam interference in cascaded FPI.

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Cheng Zhou, Jiajun Tian, and Yong Yao "Simultaneous measurement of relative humidity and temperature based on internal-external cavity Vernier effect in cascaded Fabry-Pérot interferometer", Proc. SPIE 12747, Third International Conference on Optics and Image Processing (ICOIP 2023), 127471C (31 July 2023); https://doi.org/10.1117/12.2689102

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KEYWORDS

Sensors

Vernier effect

Single mode fibers

Reflection

Relative humidity

Fiber optics sensors

Interferometers

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