Sensors 2011, 11(7), 6954-6966; doi:10.3390/s110706954
Article

A Bragg Wavelength-Insensitive Fiber Bragg Grating Ultrasound Sensing System that Uses a Broadband Light and No Optical Filter

email
Received: 18 May 2011; in revised form: 18 June 2011 / Accepted: 28 June 2011 / Published: 4 July 2011
(This article belongs to the Section Physical Sensors)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: An optical filter is incorporated in a conventional ultrasound detection system that uses a fiber Bragg grating (FBG) and broadband light source, to demodulate the FBG sensor signal. A novel ultrasound sensing system that does not require an optical filter is presented herein. Ultrasound could be detected via the application of signal processing techniques, such as signal averaging and frequency filters, to the photodetector output that corresponds to the intensity of the reflected light from a broadband light-illuminated FBG. Ultrasonic sensitivity was observed to be enhanced when an FBG was installed as a resonant sensor. This FBG ultrasound detection system is small and cheap to fabricate because it does not use a demodulating optical filter. The experimental results demonstrate that this system could be applied to ultrasonic damage inspection and acoustic emission measurements. Furthermore, this system was able to detect ultrasound despite the amount of strain or temperature that was applied to the FBG sensor because the ultrasound detection was not sensitive to the Bragg wavelength of the FBG sensor.
Keywords: fiber Bragg grating sensors; ultrasound; nondestructive testing; acoustic emission; signal processing
PDF Full-text Download PDF Full-Text [685 KB, uploaded 21 June 2014 03:53 CEST]

Export to BibTeX |
EndNote


MDPI and ACS Style

Tsuda, H. A Bragg Wavelength-Insensitive Fiber Bragg Grating Ultrasound Sensing System that Uses a Broadband Light and No Optical Filter. Sensors 2011, 11, 6954-6966.

AMA Style

Tsuda H. A Bragg Wavelength-Insensitive Fiber Bragg Grating Ultrasound Sensing System that Uses a Broadband Light and No Optical Filter. Sensors. 2011; 11(7):6954-6966.

Chicago/Turabian Style

Tsuda, Hiroshi. 2011. "A Bragg Wavelength-Insensitive Fiber Bragg Grating Ultrasound Sensing System that Uses a Broadband Light and No Optical Filter." Sensors 11, no. 7: 6954-6966.

Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert