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

National Institute of Advanced Industrial Science & Technology, AIST Tsukuba Central 2, Tsukuba, 305-8568, Japan
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)
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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

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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.

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