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Proceedings Paper

Computer-controlled optical fiber sensor system for the characterization of ultrasound
Author(s): Wai Keung Wong; Kin Seng Chiang; Xiaopeng Dong; Hau Ping Chan
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Paper Abstract

A computer-controlled optical fiber sensor system has been developed for the characterization of ultrasonic transducers in the megahertz range. The sensing element used is a short length of highly birefringent optical fiber. When an ultrasonic wave is incident normally upon the fiber, the birefringence, or the phase difference between the two polarized light waves in the fiber, is modulated. The phase modulation is converted into an intensity-modulated signal by means of polarimetry. To optimize and stabilize the signal against environmental effects such as temperature variations, a liquid-crystal phase retarder, controlled by feedback electronics, is placed in the optical path. Intensity noises arising from the laser source and the fiber leads are also eliminated by using signal processing techniques. The spatial intensity profile of an ultrasonic beam can be determined by scanning the sensing fiber across the ultrasonic beam. Fiber scanning and data acquisition are controlled by a personal computer. In this paper, the principle and the implementation of the sensor system are described. Experimental results obtained from characterizing commercial ultrasonic transducers are presented.

Paper Details

Date Published: 24 September 1996
PDF: 5 pages
Proc. SPIE 2895, Fiber Optic Sensors V, (24 September 1996); doi: 10.1117/12.252147
Show Author Affiliations
Wai Keung Wong, City Univ. of Hong Kong (China)
Kin Seng Chiang, City Univ. of Hong Kong (China)
Xiaopeng Dong, City Univ. of Hong Kong (China)
Hau Ping Chan, City Univ. of Hong Kong (China)

Published in SPIE Proceedings Vol. 2895:
Fiber Optic Sensors V
Kim D. Bennett; Byoung Yoon Kim; Yanbiao Liao, Editor(s)

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