Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7133022 | Optics and Lasers in Engineering | 2014 | 5 Pages |
Abstract
A novel humidity sensor based on an in-fiber Mach-Zehnder interferometer (MZI) is proposed and demonstrated. The sensor head is formed by a single-mode-multimode-single-mode (SM-MM-SM) fiber structure through arc fusion splicing. The intermodal interference is achieved by two waist-enlarged fiber tapers at the coupling points of the multimode fiber and single-mode fibers. The sensor has a linear response to humidity with enhanced sensitivity of â0.119Â dB/%RH in the range of 35-90%RH. Additionally, the sensor exhibited excellent temperature immunity in the temperature test. Such easily fabricated, cost-effective and temperature-immune fiber interferometer could be used for high sensitivity humidity sensing applications.
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Authors
Min Shao, Xueguang Qiao, Haiwei Fu, Huidong Li, Jianlin Zhao, Yan Li,