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首页> 外文期刊>Scientific reports. >Design of a high-precision and non-contact dynamic angular displacement measurement with dual-Laser Doppler Vibrometers
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Design of a high-precision and non-contact dynamic angular displacement measurement with dual-Laser Doppler Vibrometers

机译：双激光多普勒振动计的高精度，非接触式动态角位移测量设计

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A wide dynamic range, high precision, non-contact and large bandwidth angular displacement measurement (ADM) is greatly necessary for the applications such as industrial control and military equipment. This paper proposes a simple and effective ADM method based on Doppler Effect, heterodyne detection and diffuse reflection, which can fulfill these requirements simultaneously. Two beams of parallel light generated by a pair of laser Doppler vibrometers are incident upon the surface of rotational target, then data processing unit acquires the velocity of dual laser incident points on the moving target, and resolves the rotational angular displacement and translation displacement of target through the relationship between dual laser beams dynamically. Several major measurement errors that may affect the ADM accuracy are analyzed. A high precision rotary table is used as an angular displacement standard to verify the measurement range and accuracy, the verification experiment shows that the measurement range is not less than ±10° and the measurement accuracy is 0.0362° based on the method. After using a polynomial error compensation, the measurement accuracy can be promoted to 0.0088°, and this compensation method can be applied to real time measurement.
机译：宽动态范围，高精度，非接触式和大带宽角位移测量（ADM）对于工业控制和军事设备等应用非常必要。本文提出了一种基于多普勒效应，外差检测和漫反射的简单有效的ADM方法，可以同时满足这些要求。一对激光多普勒测振仪产生的两束平行光入射到旋转目标的表面，然后数据处理单元获取移动目标上双激光入射点的速度，并解析目标的旋转角位移和平移位移通过双激光束之间的关系动态变化。分析了可能影响ADM精度的几个主要测量误差。使用高精度转台作为角位移标准，对测量范围和精度进行了验证，验证实验表明，基于该方法，测量范围不小于±10°，测量精度为0.0362°。使用多项式误差补偿后，可以将测量精度提高到0.0088°，并且该补偿方法可以应用于实时测量。

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