Journal
OPTICAL FIBER TECHNOLOGY
Volume 67, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.yofte.2021.102744
Keywords
Optical fiber sensor; Vernier effect; PVA; Fabry-Perot interferometer; Humidity
Funding
- National Key Research and Development Project of China [2020YFF0217803]
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The paper introduces a relative humidity (RH) sensor based on vernier effect of two parallel Fabry-Perot interferometers, using polyvinyl alcohol (PVA) as the humidity sensitive material. The sensor demonstrates high sensitivity of 1.78 nm/%RH in the range of 55%RH-85%RH, with stability at 45%RH and 75%RH and a quick response time of 12s between 55%RH and 75%RH. Additionally, it features low temperature disturbance, simple principle, and easy manufacturing process.
In this paper, a relative humidity (RH) sensor based on vernier effect of two parallel Fabry-Perot interferometers is proposed and experimentally demonstrated. The polyvinyl alcohol (PVA) is chosen as the humidity sensitive material. The sensor consists of a reference cavity formed by single mode fiber - fiber capillary - single mode fiber (SMF-FC-SMF) structure and a sensing cavity formed by SMF-FC-coated structure. The sensor shows the high sensitivity of 1.78 nm/%RH in the range of 55%RH-85%RH. We measured the stability of the sensor at 45% RH and 75%RH, and the response time between 55%RH and 75%RH is 12 s. In addition, it also has the advantages of low temperature disturbance, simple principle, and easy manufacture.
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