基于连续正弦速度扫描方式的激光多普勒测振技术
On the Laser Doppler Vibrometry Technique Based on Continuous Scanning LDV with Sinusoidal Rate

本文针对逐点扫描激光多普勒非接触测振技术只能进行离散空间域振动测试的缺陷,研究了基于连续正弦速度扫描方式的激光多普勒测振新技术,实现了连续空间域的振动测试。并以简支梁为测试对象,进行了实验验证。实验结果表明：应用连续扫描激光多普勒测振技术与扫描激光多普勒测振技术获取的模态振型匹配一致,而且前者在测试时间、测试数据量及空间分辨率上都优于后者。
This paper aims at the defect of non-contact point by point scanning laser Doppler vibrometry (SLDV) which can only be applied in discrete spatial domain, a study of new laser Doppler vibrametry was carried out based on the method of continuous scanning with sinusoidal rate to realize the vibrometry in continuous space. Taking a simply supported beam as an example, experimental validation was conducted by using CSLDV and SLDV method respectively. Comparison indicates that there is a good vibration modal shape matching consistency between experimental results obtained from both CSLDV over SLDV, and the former is better than the latter in the aspects of measurement time, data volume and spatial resolution