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Fiber Bragg grating strain sensor demodulation with quadrature sampling of a Mach-Zehnder interferometer

机译:Mach-Zehnder干涉仪正交采样的光纤布拉格光栅应变传感器解调

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摘要

A simple and highly sensitive phase-demodulation technique is proposed, and its use for a fiber Bragg grating strain sensor is experimentally demonstrated. Sampling a phase-modulated Mach-Zehnder output with controlled time delay produced two quadrature data streams that have relative quadrature phase difference (90°). The Bragg wavelength-dependent phase information is extracted by application of digital arctangent function and phase unwrapping to the quadrature signals. By use of this technique with a reference grating, strain sensing at as much as a 30-kHz sampling rate was obtained with strain resolution of 3.5 microstrains and 6 nanostrains/(Hz)~(1/2) in quasi-static and dynamic strain measurements, respectively.
机译:提出了一种简单而灵敏的相位解调技术,并通过实验证明了其在光纤布拉格光栅应变传感器中的应用。对具有受控时间延迟的调相后的Mach-Zehnder输出进行采样会产生两个具有相对正交相位差(90°)的正交数据流。通过应用数字反正切函数并对正交信号进行相位解包来提取布拉格波长相关的相位信息。通过将此技术与参考光栅配合使用,在准静态和动态应变下,应变分辨率为3.5微应变和6纳应变/(Hz)〜(1/2)时,应变感测速率高达30 kHz。测量。

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