期刊
IEEE SENSORS JOURNAL
卷 19, 期 20, 页码 9215-9220出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2019.2922041
关键词
Fiber ring laser; fiber Bragg gratings; humidity sensor; temperature sensor
资金
- Designated Subsidy for Young Scientists [0402/0159/18]
- Statutory Funds of Telecommunications and Teleinformatics Department, Wroclaw University of Science and Technology [0401/0023/18]
A fiber ring laser sensor setup utilizing fiber Bragg gratings (FliCs) for simultaneous measurement of ambient temperature and relative humidity (RH) is presented. Two FBGs are incorporated as tunable filters for a dual-wavelength laser emission, where one FBG was coated with polyimide (PI) in order to achieve sensitivity to RH changes, while the other bare FBG was used for temperature sensing. An increase in RH would induce a strain on the grating, which results in a variation in the resonance wavelength of the PI-coated MG. This causes a shift in the laser emission wavelength. Being insensitive to RH changes, the bare FBG was employed to measure temperature. The dual-wavelength fiber ring laser sensor created, and thus allows to determine simultaneous measurement of RH and temperature. The RH sensitivities observed by the PI-coated FBC to RH and temperature are 3.6 pm/%RH and 12.15 pm/degrees C. The temperature sensitivity of the hare FBG was observed to he 9.6 pm/degrees C. The main advantage of the proposed setup is an optical signal to noise ratio (OSNR) higher than 55 dB and 3 dB bandwidth less than 0.02 nm, which points out efficient capabilities for both precise sensing and remote detection applications.
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