摘要
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 -0.119 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.
源语言 | 英语 |
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页(从-至) | 86-90 |
页数 | 5 |
期刊 | Optics and Lasers in Engineering |
卷 | 52 |
期 | 1 |
DOI | |
出版状态 | 已出版 - 2014 |