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Conference

Fiber-optic microcavity temperature and humidity sensor based on the Vernier effect

Wen-Wen Qian Xin-Ying Lu Shu-Qing Zhang Zhi-Xiang Huang Bin-Bin Shen Yi-Lai Zou Jia-Ping Qiu Chun-Liu Zhao
Sep 2026 · International Conference on Precision Instruments and Optical Engineering · Vol 14372, pp. 1437202 - 1437202-6 · 0 citations · 10 references
Engineering

Abstract

A Vernier effect–based fiber-optic microcavity sensor is proposed for simultaneous temperature and humidity sensing. Using a sensing Fabry–Perot interferometer (FPI) with a UV-adhesive cavity and a reference air-cavity FPI in parallel, the Vernier effect amplifies spectral shifts. The sensor exhibits temperature sensitivity of –1.097 nm/°C (4.18× enhancement) and humidity sensitivity of –0.469 nm/%RH (4.11× enhancement). Through FFT and band-pass filtering, a sensitivity matrix enables dual-parameter decoupling. With simple structure and high sensitivity, it is suitable for environmental, biomedical, and industrial monitoring.

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