激光干涉测量中光学窗口受动态压力的影响分析

利用激光干涉仪对动态压力进行非接触测量时,压力腔中常设计光学窗口,目的是在动态压力环境与激光干涉仪间建立光学通道,利用激光干涉法使动态压力能溯源到时间、长度与静态压力上。由于在动态压力环境下光学窗口受到内外压差、温度梯度、振动等因素影响,将直接影响光学测量精度。针对上述问题,通过仿真分析方法,分析在动态压力环境下压力、温度、振动与光学窗口的影响关系,同时通过光学窗口在动态压力环境下试验,研究各影响分量对真实测量结果的影响,可为后续动态压力的校准和测量进行修正和补偿以及其他类似动态压力环境下的光学窗口设计提供依据。

Influence of dynamic pressure on the optical window in laser interferometry

The optical window is often designed in the pressure chamber when a laser interferometer does the non-contact measurement of dynamic pressure in order to establish optical channels between dynamic pressure and laser interferometer.However, under dynamic pressure environment, optical windows are affected by the internal and external pressure difference, temperature variation, vibration and other factors, which will directly affect the accuracy of optical measurement.To solve the above problem, through simulation analysis, the relationship between the optical window and the pressure, temperature, vibration under dynamic pressure environment was analyzed.At the same time, the optical window was tested under dynamic pressure environment to study the influence of each influential component on the real measurement results, which can modify and compensate for the accuracy of calibration and measurement of dynamic pressure.It also provides a basis for the optical window design under other similar dynamic measurements.