Simultaneous Measurement of Temperature and Relative Humidity Using a Dual-Wavelength Erbium-Doped Fiber Ring Laser Sensor

M?dry, Mateusz; Alwis, Lourdes; Binetti, Leonardo; Pajewski, ?ukasz; Bere?-Pawlik, El?bieta

Abstract

A fiber ring laser sensor setup utilizing FBGs (Fiber Bragg Gratings) 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 FBG. 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 thus allows to determine simultaneous measurement of RH and temperature. The RH sensitivities observed by the PI coated FBG to RH and temperature are 3.6 pm/%RH and 12.15 pm/°C respectively. The temperature sensitivity of the bare FBG was observed to be 9.6 pm/°C. The main advantage of the proposed setup is an optical signal to noise ratio (OSNR) higher than 55 dB and a 3 dB-bandwidth less than 0.02 nm, which points out efficient capabilities for both precise sensing and remote detection applications.

Citation

Mądry, M., Alwis, L., Binetti, L., Pajewski, Ł., & Bereś-Pawlik, E. (2019). Simultaneous Measurement of Temperature and Relative Humidity Using a Dual-Wavelength Erbium-Doped Fiber Ring Laser Sensor. IEEE Sensors Journal, 19(20), 9215-9220. https://doi.org/10.1109/JSEN.2019.2922041

• Journal Article Type: Article
• Acceptance Date: May 24, 2019
• Online Publication Date: Jun 10, 2019
• Publication Date: Oct 15, 2019
• Deposit Date: May 31, 2019
• Publicly Available Date: Jun 11, 2021
• Journal: IEEE Sensors Journal
• Print ISSN: 1530-437X
• Electronic ISSN: 1558-1748
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 19
• Issue: 20
• Pages: 9215-9220
• DOI: https://doi.org/10.1109/JSEN.2019.2922041
• Keywords: Fiber ring laser, fiber Bragg gratings, humidity sensor, temperature sensor
• Public URL: http://researchrepository.napier.ac.uk/Output/1841072