FIBER OPTICS

Response of a fiber Bragg grating ultrasonic sensor

[+] Author Affiliations
Pavel Fomitchov, Sridhar Krishnaswamy

Northwestern University, Center for Quality Engineering and Failure Prevention, 2137?North Sheridan Road, Evanston, Illinois?60208 E-mail: s-krishnaswamy@nwu.edu

Opt. Eng. 42(4), 956-963 (Apr 01, 2003). doi:10.1117/1.1556372
History: Received May 31, 2002; Revised Sep. 12, 2002; Accepted Sep. 13, 2002; Online April 01, 2003
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A fiber Bragg grating (FBG) sensor for detection of ultrasonic waves in liquids and solid structures is investigated. The sensor contains a fiber probe with a FBG, a tunable narrowband laser source, and a photodetector. When ultrasonic waves impinge on the fiber probe, the pitch of the grating is modulated through the elasto-optic effect. The corresponding changes in reflectivity of the grating are detected by a photodetector. The sensitivity of the sensor and its frequency and directional response in the 0.5 to 3.0 MHz range are measured. Some anomalous features of the FBG ultrasound sensor response are noted. It is shown that these features result from a combination of the sensor’s response to the direct ultrasonic waves propagating through the medium and the signal generated by axially guided ultrasonic waves propagating through the fiber probe. © 2003 Society of Photo-Optical Instrumentation Engineers.

© 2003 Society of Photo-Optical Instrumentation Engineers

Citation

Pavel Fomitchov and Sridhar Krishnaswamy
"Response of a fiber Bragg grating ultrasonic sensor", Opt. Eng. 42(4), 956-963 (Apr 01, 2003). ; http://dx.doi.org/10.1117/1.1556372


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