期刊
IEEE SENSORS JOURNAL
卷 23, 期 2, 页码 1139-1145出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2022.3224238
关键词
Sensors; Optical fiber sensors; Coatings; Reflection; Optical fibers; Humidity; Sensitivity; Agarose gel; fiber sensor; humidity; Michelson interferometer (MI)
A tip Michelson interferometer (MI) is proposed and experimentally demonstrated for relative humidity (RH) sensing. The device consists of a short capillary tube with a small inner diameter that is spliced to a single-mode fiber (SMF) and coated with agarose gel on its end face, and the solid capillary wall and gel act as the sensing arm of the MI. The relationship between the structural parameters and the performance of the device is revealed, and the maximum sensitivity of 0.752 nm/% RH with a linear correlation coefficient of 0.9927 within the range of 25%-90% RH is obtained. The proposed sensor exhibits good performances of robustness, compact size, high repeatability, fast response (<100 ms), and small measurement uncertainty (<0.21% RH), making it promising for accurate static or dynamic moisture measuring.
A tip Michelson interferometer (MI) is proposed and experimentally demonstrated for relative humidity (RH) sensing. The device consists of a short capillary tube with a small inner diameter that is spliced to a single-mode fiber (SMF) and coated with agarose gel on its end face, and the solid capillary wall and gel act as the sensing arm of the MI. When the agarose gel absorbs water modules, its refractive index (RI) and volume vary, resulting in the shift of the reflection spectrum of the MI. The relationship between the structural parameters and the performance of the device is revealed after performing theoretical analysis and experimental verification, which provides guidance for optimizing the device. The maximum sensitivity of 0.752 nm/% RH with a linear correlation coefficient of (Adjusted R-2) 0.9927 within the range of 25%-90% RH is obtained. Moreover, the proposed sensor exhibits good performances of robustness, compact size, high repeatability, fast response (<100 ms), and small measurement uncertainty (<0.21% RH), which makes the sensor promising for accurately static or dynamic moisture measuring.
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