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首页> 外文期刊>Journal of Nanoelectronics and Optoelectronics >A Fiber Laser Doppler Vibrometer Based on Fringe Counting and Multi-Period Synchronous Frequency Measurement Method
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A Fiber Laser Doppler Vibrometer Based on Fringe Counting and Multi-Period Synchronous Frequency Measurement Method

机译：基于边缘计数和多周期同步频率测量方法的光纤激光多普勒测振仪

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摘要

The conventional laser Doppler vibrometer (LDV) are mostly using 633 nm wavelength, which can provide a narrow spectral line width but have rather limited penetration depth and power, larger size and poor flexibility. This paper presents a fiber LDV at 1550 nm with smaller size and better flexibility and develops a real-time Doppler signal demodulation circuit based on FPGA. First, a band pass filter is designed to remove DC bias and photo detector noise. Then, a high-speed hysteresis comparator circuit with independent positive hysteresis and negative hysteresis threshold is designed by using two IC comparators and sequential logic in FPGA, which can convert the AC Doppler signal into rectangle wave for further digital signal demodulation. At last, the displacement is measured using the fringe counting method, and the velocity is measured using a multi-period synchronous method. Experiments on coil motor displacement measurement and tuning fork's nature frequency measurement demonstrate that this newly-designed fiber LDV provides well measurement accuracy and resolution, and is adequate for most of vibration measurement applications.
机译：传统的激光多普勒振动计（LDV）主要使用633 nm波长，该波长可以提供较窄的光谱线宽度，但穿透深度和功率相当有限，尺寸较大且柔韧性差。本文提出了一种1550 nm的LDV光纤，它具有更小的尺寸和更好的灵活性，并开发了一种基于FPGA的实时多普勒信号解调电路。首先，设计一个带通滤波器以消除直流偏置和光电检测器噪声。然后，利用FPGA中的两个IC比较器和时序逻辑，设计了具有独立正滞后和负滞后阈值的高速滞后比较器电路，该电路可以将交流多普勒信号转换为矩形波，以进一步进行数字信号解调。最后，使用条纹计数法测量位移，并使用多周期同步法测量速度。线圈电机位移测量和音叉固有频率测量的实验表明，这种新设计的光纤LDV具有良好的测量精度和分辨率，并且适合大多数振动测量应用。

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