Journal
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
Volume 70, Issue -, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIM.2020.3034154
Keywords
Humidity sensor; Mach-Zehnder interference; optical fiber sensor; polyvinyl alcohol (PVA); tapered fiber
Funding
- China Postdoctoral Science Foundation
- National Natural Science Foundation of China [61903073]
- Fundamental Research Funds for the Central Universities [N2004011]
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A highly sensitive humidity sensor with low-temperature sensitivity is realized by plating a PVA moisture-sensitive film onto a tapered optical fiber. The sensor shows high humidity sensitivity and low-temperature sensitivity, allowing for accurate measurement of environmental humidity while eliminating temperature interference. Additionally, the sensor exhibits excellent reversibility, stability, and advantages typical of optical fiber sensors.
A highly sensitive humidity sensor with low-temperature sensitivity is proposed and demonstrated using a polyvinyl alcohol (PVA) coating tapered fiber. The taper fiber is highly sensitive to the environmental medium due to its microscale diameter. Thus, a humidity sensor can be prepared by plating a PVA moisture-sensitive film in a tapered region. The experimental results show that the sensor has a high humidity sensitivity of 0.1194 nm/%RH but with a relatively low-temperature sensitivity of 0.029 nm/degrees C. Thus, the sensor can eliminate temperature interference and achieve accurate measurement of environmental humidity. At the same time, the sensor has excellent reversibility, stability, and advantages common to optical fiber sensors, such as small size, antielectromagnetic interference, and remote measurement.
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