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- Title
Fluorinated Polyimide-Film Based Temperature and Humidity Sensor Utilizing Fiber Bragg Grating.
- Authors
Xu, Xiuxiu; Luo, Mingming; Liu, Jianfei; Luan, Nannan
- Abstract
We propose and demonstrate a temperature and humidity sensor based on a fluorinated polyimide film and fiber Bragg grating. Moisture-induced film expansion or contraction causes an extra strain, which is transferred to the fiber Bragg grating and leads to a humidity-dependent wavelength shift. The hydrophobic fluoride doping in the polyimide film helps to restrain its humidity hysteresis and provides a short moisture breathing time less than 2 min. Additionally, another cascaded fiber Bragg grating is used to exclude its thermal crosstalk, with a temperature accuracy of ±0.5 °C. Experimental monitoring over 9000 min revealed a considerable humidity accuracy better than ±3% relative humidity, due to the sensitized separate film-grating structure. The passive and electromagnetic immune sensor proved itself in field tests and could have sensing applications in the electro-sensitive storage of fuel, explosives, and chemicals.
- Subjects
FIBER Bragg gratings; OPTICAL gratings; TEMPERATURE sensors; POLYIMIDE films; HUMIDITY; FUEL storage
- Publication
Sensors (14248220), 2020, Vol 20, Issue 19, p5469
- ISSN
1424-8220
- Publication type
Letter
- DOI
10.3390/s20195469