高温环境激光测振实验研究

Research of Vibration Measurement Experiment by Laser in High Temperature

根据激光测振原理,搭建了一套高温环境下的激光测振试验系统。利用该系统进行实验,分析了动圈连接杆对振动的传递效果,在中频下的传递误差较小,高频下传递误差较大,并为激光测振实验选取了合适的激励频率。进行了高温环境下的比较法测振和激光测振实验,通过与参考加速度计的测量结果进行对比,得到高温下的比较法测振和激光测振相对误差,并对误差影响因素进行了分析。实验表明,激光测振能够弥补压电加速度计在高温下测振的不足,且具有较好的稳定性和较高的精度。

Based on the principle of vibration measurement by laser, a system of vibration measurement by laser in high temperature is built. Experiments are conducted to analyze the transferring effect of the connecting pole. In medium frequency, the transferring error is small and in high frequency it is large, and an appropriate simulating frequency is determined for vibration measurement experiment by laser. Compared with the referenced accelerometer, relative error of vibration measurement by laser and comparison method in high temperature is obtained, and the error influencing factors are analyzed. Experiments indicate that vibration measurement by laser can make up the shortage of accelerometer in high temperature, vibration t by laser in high temperature is stable and the measurement precision is high.