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首页> 外文期刊>Japanese Journal of Applied Physics. Part 2, Letters & Express Letters >Fiber-Optic Distributed Strain Sensing System by Brillouin Optical Correlation Domain Analysis with a Simple and Accurate Time-Division Pump-Probe Generation Scheme
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Fiber-Optic Distributed Strain Sensing System by Brillouin Optical Correlation Domain Analysis with a Simple and Accurate Time-Division Pump-Probe Generation Scheme

机译:布里渊光学相关域分析的光纤分布式应变传感系统,采用简单而精确的时分泵浦探针生成方案

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摘要

A simplified and accurate system of Brillouin optical correlation domain analysis for fiber-optic distributed strain sensing is proposed and demonstrated. In the system, pump and probe lightwaves, with about 11 GHz frequency difference for stimulating fiber Brillouin scattering, are generated accurately in a time-division way by using direct-frequency-modulation nature of a laser diode. We have developed a scheme for rigorously compensating frequency modulation response of the laser diode to realize accurately a rectangular frequency modulation with such large amplitude for the time-division pump-prove generation. Distribution of Brillouin gain spectrum along an optical fiber has successfully been measured, with 16 cm spatial resolution, using the waveform pre-compensated accurately for the laser frequency modulation.
机译:提出并证明了一种用于光纤分布式应变传感的布里渊光学相关域分析的简化而精确的系统。在该系统中,利用激光二极管的直接调频特性,以时分方式精确地产生了泵浦和探测光波,它们之间的频率差约为11 GHz,以刺激光纤布里渊散射。我们已经开发出一种严格补偿激光二极管的频率调制响应的方案,以精确地实现具有如此大幅度的矩形频率调制,以用于时分泵验证。使用精确补偿激光频率调制的波形,已成功测量了布里渊增益沿光纤的分布,其空间分辨率为16 cm。

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