4.7 Article

A real-time response relative humidity sensor based on a loop microfiber coated with polyvinyl alcohol film

Journal

MEASUREMENT
Volume 187, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.measurement.2021.110359

Keywords

Loop microfiber interferometer; Polyvinyl alcohol (PVA); Relative humidity (RH) sensor; Good stability

Funding

  1. Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi, China [2019L0084, 2019L0002]
  2. National Natural Science Foundation of China [62005147, 61722507, 61901249]
  3. Funds for International Cooperation and Exchange of the National Natural Science Foundation of China [62020106014]

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The sensor demonstrated is a high sensitivity optical fiber loop-based relative humidity sensor with low-temperature sensitivity, coated with polyvinyl alcohol (PVA) film. The sensor has a high refractive index (RI) sensitivity of 2979 nm/RIU and a relatively low temperature sensitivity of 0.0075 nm/degrees C, providing accurate RH measurement.
A high sensitivity optical fiber loop-based relative humidity (RH) sensor coated with polyvinyl alcohol (PVA) film is demonstrated, which has low-temperature sensitivity. The loop region of the sensor (micron-sized diameter) is very sensitive to the environmental medium due to strong evanescent fields out of fiber cladding. The refractive index (RI) sensitivity is as high as 2979 nm/RIU, while the temperature sensitivity is relatively low at 0.0075 nm/degrees C. The experimental results show that the sensor has the RH sensitivity of 0.533 nm/%RH (wavelength modulation) and -0.213 dBm/%RH (intensity modulation). The proposed sensor has good real-time, stability and repeatability, which provides a guarantee for accurate RH measurement.

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