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23 October 2018 Dual biconical fiber humidity sensor at 2μm
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Abstract
This paper studies a humidity dual biconical fiber sensor coated with agarose gel. The sensor was fabricated by the taper drawing technique of using a LZM-100 fusion splicer from single mode fiber, forming a Mach-Zehnder interferometer. Humidity modifies the refractive index of the coating layer, which in turn alters the high order modes along the dual biconical fiber segment and causes a detectable shift to the interference pattern. Due to the strong light absorption of agarose at 2 μm, the sensitivity of sensor was greatly enhanced. It has been found that the sensor’s sensitivity operated at 2 μm is tens of times higher than that at 1.55 μm region.
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Weijuan Chen, Zhihao Chen, Yi Zhang, Huibin Chen, Hui Li, and Yanhui Lian "Dual biconical fiber humidity sensor at 2μm", Proc. SPIE 10821, Advanced Sensor Systems and Applications VIII, 1082109 (23 October 2018); https://doi.org/10.1117/12.2500042
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