Journal
IEEE SENSORS JOURNAL
Volume 21, Issue 2, Pages 1561-1567Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2020.3019717
Keywords
Humidity; Temperature sensors; Optical fiber sensors; Reflection; Interference; Sensitivity; In-fiber Michelson interferometer; humidity sensor; photonic crystal fiber; fiber taper; humidity sensitivity
Funding
- National Natural Science Foundation of China [61805197]
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The study presents a humidity sensor based on photonic crystal fiber, demonstrating high sensitivity and fast response, showing promising practical prospects.
A humidity sensor based on photonic crystal fiber (PCF) is experimentally demonstrated, which was fabricated by sandwiching a taper between PCF and a standard single mode fiber (SMF). The taper and collapsed region in PCF excite high-order modes and couple them with core mode to form a Michelson interferometer (MI). Experiment results show that the reflection interference intensity linearly changes with humidity and the sensitivity is -0.166 dB/%RH in the range of 30-90 %RH, the sensor displayed a low temperature cross-sensitivity of 0.09 %RH/degrees C in the temperature range of 20-100 degrees C. In addition, a rise/recovery time of 400/200 ms was achieved respectively for human breathing test. The easy fabrication, high sensitivity and fast response indicate the sensor has broad practical prospects.
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