STABILIZATION OF AN EMBEDDED FIBER OPTIC FABRY-PEROT SENSOR FOR ULTRASOUND DETECTION

被引:78
作者
DORIGHI, JF
KRISHNASWAMY, S
ACHENBACH, JD
机构
[1] Center for Quality Engineering and Failure Prevention, Northwestern University, Evanston
关键词
D O I
10.1109/58.464837
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
A method is proposed to stabilize an intrinsic fiber optic Fabry-Perot interferometric sensor embedded in a solid material for the purpose of detecting ultrasound. Without stabilization the interferometer drifts out of quadrature due to the presence of low-frequency dynamic strains. Stabilization is achieved by using active homodyne stabilization which tunes the laser frequency to maintain quadrature. A control loop shifts the laser frequency by 10 GHz at rates less than 25 Hz in order to compensate for induced drifts. The stabilization procedure was tested for a sensor embedded in an epoxy plate. Ultrasonic pulses, generated by a 5 MHz piezoelectric transducer, were detected with the embedded fiber sensor stabilized in the presence of applied low frequency strains. Improvements in sensitivity which result from stabilization are demonstrated. Additionally, a simulated acoustic emission signal, generated by a lead pencil break (Hsu-Neilson source), was detected with the sensor stabilized in the presence of dynamic strains.
引用
收藏
页码:820 / 824
页数:5
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