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Jiang W, Sun S, Song J, Gao J, Hu C, Li L, Deng L, Chen F. High-sensitivity humidity and temperature sensor by cascading a polyimide coated long period fiber grating and a polydimethylsiloxane wrapped Mach-Zehnder interferometer. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2023; 94:125002. [PMID: 38051177 DOI: 10.1063/5.0163910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Accepted: 11/13/2023] [Indexed: 12/07/2023]
Abstract
Two different structures, long period fiber grating (LPFG) and a Mach-Zehnder interferometer (MZI), were cascaded to fabricate a sensor for sensing humidity and temperature simultaneously. Due to the humidity sensitive characteristic of polyimide (PI) and the temperature sensitive characteristic of polydimethylsiloxane (PDMS), the LPFG was coated with PI and the MZI was wrapped in PDMS to improve the humidity and temperature sensitivities, respectively. Humidity and temperature experiments and the stability and repeatability of the proposed sensors were performed. The sensor shows humidity and temperature sensitivities of ∼164 pm/%RH and 183 pm/°C in the humidity and temperature increasing experiments, respectively. Combining increasing, decreasing, and repeatable experiments of temperature and humidity, the proposed sensor shows stable performance in humidity sensitivity of ∼159 pm/%RH and temperature sensitivity of ∼175 pm/°C, with good linearity of ∼0.994. The structure of the proposed sensor has the advantages of low implementation cost, easy fabrication, and good stability.
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Affiliation(s)
- Wenbo Jiang
- College of Physics and Electronic Science, Hubei Normal University, Huangshi, Hubei 435002, China
| | - Simei Sun
- College of Physics and Electronic Science, Hubei Normal University, Huangshi, Hubei 435002, China
| | - Jiao Song
- College of Physics and Electronic Science, Hubei Normal University, Huangshi, Hubei 435002, China
| | - Jiawei Gao
- College of Physics and Electronic Science, Hubei Normal University, Huangshi, Hubei 435002, China
| | - Chuanju Hu
- College of Physics and Electronic Science, Hubei Normal University, Huangshi, Hubei 435002, China
| | - Li Li
- College of Physics and Electronic Science, Hubei Normal University, Huangshi, Hubei 435002, China
| | - Longfeng Deng
- College of Physics and Electronic Science, Hubei Normal University, Huangshi, Hubei 435002, China
| | - Fulin Chen
- College of Physics and Electronic Science, Hubei Normal University, Huangshi, Hubei 435002, China
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