论文标题
建立用于扫描激光多普勒振动仪的校正解决方案，受传感器头振动影响
Establishing correction solutions for Scanning Laser Doppler Vibrometer measurements affected by sensor head vibration
论文作者
论文摘要
扫描激光多普勒振动仪（SLDV）测量受传感器头振动的影响，就好像它们是目标表面本身的振动一样。本文提出了实用的更正计划来解决这个重要问题。该研究始于理论分析，用于任意振动和任何扫描构型，这表明所需的唯一测量是在最终转向镜上的事件速度上的振动速度，该方向是在即将推出的激光束的方向上，这是对两个校正选项的基础。校正传感器位置至关重要；第一个方案使用位于发射激光束的两侧的SLDV前面板上的加速度计对，而第二个则使用沿最终转向镜后面的光轴的单个加速度计。具有振动传感器头和固定目标的初始实验证实了对传感器头振动的敏感性以及校正方案的有效性，从而使总体误差减少了17 dB（加速度计）和27 dB（单加速度计）。在通过传感器头和目标振动进行的广泛进一步测试中，跨各个扫描角度进行，校正方案通常减少了14 dB（加速度计对）和20 dB（单加速度计）。对于单个加速度计选项，RMS相误差也降低了30％，将其确认为首选选项。该理论提出了校正测量值的几何加权，这提供了较小的额外改进。由于传向激光束的方向及其在最终转向镜上的入射点在镜子扫描激光束时都会改变，因此使用安装在固定位置的固定轴校正传感器的使用使校正不完美。相关的错误估计并期望通常很小，并且理论基础...
Scanning Laser Doppler Vibrometer (SLDV) measurements are affected by sensor head vibrations as if they are vibrations of the target surface itself. This paper presents practical correction schemes to solve this important problem. The study begins with a theoretical analysis, for arbitrary vibration and any scanning configuration, which shows that the only measurement required is of the vibration velocity at the incident point on the final steering mirror in the direction of the outgoing laser beam and this underpins the two correction options investigated. Correction sensor location is critical; the first scheme uses an accelerometer pair located on the SLDV front panel, either side of the emitted laser beam, while the second uses a single accelerometer located along the optical axis behind the final steering mirror. Initial experiments with a vibrating sensor head and stationary target confirmed the sensitivity to sensor head vibration together with the effectiveness of the correction schemes which reduced overall error by 17 dB (accelerometer pair) and 27 dB (single accelerometer). In extensive further tests with both sensor head and target vibration, conducted across a range of scan angles, the correction schemes reduced error by typically 14 dB (accelerometer pair) and 20 dB (single accelerometer). RMS phase error was also up to 30% lower for the single accelerometer option, confirming it as the preferred option. The theory suggests a geometrical weighting of the correction measurements and this provides a small additional improvement. Since the direction of the outgoing laser beam and its incident point on the final steering mirror both change as the mirrors scan the laser beam, the use of fixed axis correction transducers mounted in fixed locations makes the correction imperfect. The associated errors are estimated and expected to be generally small, and the theoretical basis...
