Journal
IEEE SENSORS JOURNAL
Volume 19, Issue 12, Pages 4443-4450Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2019.2900080
Keywords
Optical fiber; Vernier effect; PDMS film; cascaded Fabry-Perot interferometer; volatile organic compound
Funding
- Project of The National Key Research and Development Program of China [2017YFC0805905]
- Natural Science Foundation of China [61775202]
- Natural Science Foundation of Zhejiang Province China [LY17F050010]
- National Natural Science Foundation of China [11874332]
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A novel volatile organic compound (VOC) sensor based on poly (dimethylsiloxane) (PDMS) coated Fabry-Perot interferometer (FPI) with Vernier effect was experimentally demonstrated. The proposed sensor, total length is similar to 1 mm, is composed of a segment of large mode area fiber (LMAF) and a segment of hollow-core fiber (HCF). The HCF and the LMAF form two Fabry-Perot cavities and achieve the Vernier effect. The proposed sensor head was coated with PDMS film so it is not affected by humidity. The high sensitivity of the proposed VOC sensor will be achieved by monitoring the interference spectral envelope of the cascaded FPI due to the Vernier effect, even the VOC sensor is short. The experimental results show that the sensitivity of isopropanol is 20 pm/ppm with the range from 0 to 500 ppm and the response time is similar to 50 s. The sensor has high sensitivity, waterproofness, and gas selectivity.
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