Abstract
A high-sensitive optical fiber humidity sensor based on in-line Michelson interferometer (MI) is proposed and demonstrated. The MI is formed by an asymmetric dual-core fiber (DCF) spliced with a short section of multimode fiber (MMF). The MMF serves as fiber coupler, while the DCF creates a strong intermodal interference to strengthen the interaction between light and ambient moisture. The sensor presents a humidity sensitivity of −0.199 dB/%RH in a wide relative humidity (RH) range of 20–90%RH without any humidity-sensitive material. An experiment based on human breathing shows that the response time and recovery time are 562 ms and 308 ms, respectively. In addition, the performance of stability and temperature response are tested, the standard measurement error is 0.21 %RH and the temperature sensitivity is 0.0398 nm/°C. Experimental results indicate the sensor has a good practical prospect.
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