LDV对典型电工材料表面非接触振动检测的有效性分析

为实现对电力设备表面振动的远距离测量,搭建1 550 nm收发一体的全光纤激光多普勒测振仪(laser Doppler vibrometer, LDV)系统.加工不同电工材料(铁、铝合金、铜、铝、硅橡胶、高强陶瓷)表面试样,通过电磁振动台对不同距离试样施加频率为0.05～2.00 kHz的机械振动,使用研制的LDV系统对不同电工材料表面振动测量的频响特性和距离特性进行对比分析,以探究LDV技术在典型电工材料非接触振动测量的有效性.试验结果表明,所搭建的LDV系统能够在3 m的安全工作距离内,实现对不同电工材料表面在典型设备运行工况下的振动波形采集. LDV系统对除硅橡胶和铁以外的4种电工材料均有良好的振动测试效果,并且对铝合金及铝材料能够实现3～10 m的距离响应.

Effectiveness analysis of LDV in non-contact vibration detection of typical electrical materials

A 1 550 nm all-fiber transceiving laser Doppler vibrometer LDV system was built for the long-range measurement of surface vibrations of electrical equipment. The surface specimens of different electrical materials (iron, aluminum alloy, copper, aluminum, silicone rubber and high-strength ceramics) were processed and mechanical vibrations with frequencies ranging from 0.05 to 2.00 kHz were applied to the specimens at different distances by means of an electromagnetic shaker. The comparison of the frequency response and distance characteristics of surface vibration measurements of different electrical materials was carried out using the developed LDV system to investigate the effectiveness of the LDV technique in non-contact vibration measurements of typical electrical materials. The test results indicated that the LDV system can collect vibration waveforms of different electric materials within 3m, with good vibration measurement effects on the tested materials except silicon rubber and iron, it can respond to aluminum alloy and aluminum from 3 m to 10 m.