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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Stabilization of an embedded fiber optic Fabry-Perot sensor forultrasound detection
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Stabilization of an embedded fiber optic Fabry-Perot sensor forultrasound detection

机译：稳定用于光纤检测的嵌入式光纤Fabry-Perot传感器

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摘要

A method is proposed to stabilize an intrinsic fiber opticnFabry-Perot interferometric sensor embedded in a solid material for thenpurpose of detecting ultrasound. Without stabilization theninterferometer drifts out of quadrature due to the presence ofnlow-frequency dynamic strains. Stabilization is achieved by using activenhomodyne stabilization which tunes the laser frequency to maintainnquadrature. A control loop shifts the laser frequency by 10 GHz at ratesnless than 25 Hz in order to compensate for induced drifts. Thenstabilization procedure was tested for a sensor embedded in an epoxynplate. Ultrasonic pulses, generated by a 5 MHz piezoelectric transducer,nwere detected with the embedded fiber sensor stabilized in the presencenof applied low frequency strains. Improvements in sensitivity whichnresult from stabilization are demonstrated. Additionally, a simulatednacoustic emission signal, generated by a lead pencil break (Hsu-Neilsonnsource), was detected with the sensor stabilized in the presence ofndynamic strains
机译：提出了一种稳定本征光纤Fabry-Perot干涉传感器的方法，该传感器嵌入固体材料中，然后用于检测超声波。在没有稳定的情况下，由于低频动态应变的存在，干涉仪会偏离正交。稳定是通过使用主动态苯并菲安定来实现的，后者可以调节激光频率以保持正交。控制环路以小于25 Hz的速率将激光频率移动10 GHz，以补偿感应的漂移。然后测试了嵌入环氧树脂板中的传感器的稳定程序。由5 MHz压电换能器产生的超声波脉冲，通过嵌入的光纤传感器在施加低频应变的情况下稳定进行检测。证明了由于稳定而导致的灵敏度的提高。此外，在动态应变存在的情况下稳定了传感器，检测了由铅笔折断（Hsu-Neilsonnsource）产生的模拟的声发射信号。

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