2019 journal article
High-Speed Interrogation Approach for FBG Sensors Using a VCSEL Array Swept Source
IEEE SENSORS JOURNAL, 19(21), 9766–9774.
author keywords: Vertical cavity surface emitting lasers; Calibration; Sensors; Fiber gratings; Optical filters; Bandwidth; Fiber Bragg grating; optical fiber sensor; VCSEL source
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy
(OpenAlex)
Source: Web Of Science
Added: November 11, 2019
This paper presents a fiber Bragg grating (FBG) interrogator based on vertical surface cavity emitting lasers (VCSEL). A Fabry–Pérot filter technique is developed to directly calibrate the dynamic wavelength behavior of VCSELs at both low and high sweep rates. A broad bandwidth light source is constructed by multiplexing five VCSELs together to increase the number of FBGs that can be tracked. Scanning of the VCSEL-array is accomplished by a high-speed electronic switch circuit. The developed interrogator achieves a sweep bandwidth of 10 nm at a scanning rate of 4 kHz. Low-velocity impact testing of a composite plate with a surface mounted FBG sensor shows that the wavelength detection error was 2.7% when compared with the FBG strain obtained by a high-speed swept laser.