Fluorinated Polyimide-Film Based Temperature and Humidity Sensor Utilizing Fiber Bragg Grating

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 h...

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Published in:Sensors (Basel, Switzerland) Switzerland), 2020-09, Vol.20 (19), p.5469
Main Authors: Xu, Xiuxiu, Luo, Mingming, Liu, Jianfei, Luan, Nannan
Format: Article
Language:English
Subjects:
Accuracy
Bragg gratings
Crosstalk
Electromagnetism
Explosives
fiber Bragg grating
Field tests
fluorinated polyimide film
Fluorination
Humidity
humidity hysteresis
Letter
Moisture
Moisture absorption
Molecular weight
Relative humidity
Sensors
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cited_by cdi_FETCH-LOGICAL-c446t-3badc66aff9cb7882b38ce9ae42883347f7d89ca01217390dc477add20c7a0243
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container_end_page
container_issue 19
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container_title Sensors (Basel, Switzerland)
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creator Xu, Xiuxiu
Luo, Mingming
Liu, Jianfei
Luan, Nannan
description 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.
doi_str_mv 10.3390/s20195469
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subjects Accuracy
Bragg gratings
Crosstalk
Electromagnetism
Explosives
fiber Bragg grating
Field tests
fluorinated polyimide film
Fluorination
Humidity
humidity hysteresis
Letter
Moisture
Moisture absorption
Molecular weight
Relative humidity
Sensors
title Fluorinated Polyimide-Film Based Temperature and Humidity Sensor Utilizing Fiber Bragg Grating
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