A lasing wavelength stabilized simultaneous multipoint acoustic sensing system using pressure-coupled fiber Bragg gratings
Jung-Ryul Lee a , , , See Yenn Chong a , Chang-Yong Yun a and Dong-Jin Yoon b a Department of Aerospace Engineering, Chonbuk National University, 664-14 Duckjin-dong, Duckjin-gu, Jeonju, Chonbuk 561-756, Republic of Korea b Safety Measurement Center, Korea Research Institute of Standards and Science, 209 Gajeong-ro Yuseong-gu, Daejeon, Republic of Korea Received 5 June 2010; revised 17 July 2010; accepted 15 August 2010. Available online 30 August 2010. Abstract A fiber Bragg grating (FBG) sensor head, using a pressure coupling mechanism, was designed for broadband frequency response and structural strain-free characteristic. The pressure-coupled sensor heads were connected to a simultaneous multipoint acoustic sensing system based on a tunable laser. An intelligent lasing wavelength stabilization algorithm capable of identifying the direction of spectrum movement, the wavelength shifting speed, and a fiber bending event was developed so that the simultaneou...