基于大气参数修正的时变大气透过率测试方法研究

Time-varying atmospheric transmittance measurement method based on atmospheric parameter correction

为了解决航空发动机开车时外场水平大气透过率无法测量的问题,提出一种基于实测大气参数修正的时变大气透过率测试方法。以标准黑体为测试对象,沿着大面源黑体中轴线布设在线式传感器,获得测试路径上的大气参数分布。将实测大气参数输入大气透过率模型,获得理论计算的大气透过率,并对实测大气透过率进行修正。测试结果表明:长波波段修正后的大气透过率与理论计算的平均相对误差为2.81%,中波波段修正后的大气透过率与理论计算的平均相对误差为5.77%,验证了该方法的可行性。

In order to solve the problem that the horizontal atmospheric transmittance cannot be measured when the aero-engine is running,a time-varying atmospheric transmittance test method based on the correction of measured atmospheric parameters was proposed.Taking the standard black body as the test object,the online sensor was arranged along the central axis of the large area source black body to obtain the distribution of atmospheric parameters on the test path,and the measured atmospheric parameters were input into the atmospheric transmittance model to obtain the theoretically calculated atmospheric transmittance,and correction of the measured atmospheric transmittance was carried out.The test results show that the average relative error between the corrected atmospheric transmittance in the long-wave band and the theoretical calculation is 2.81%;the average relative error between the corrected atmospheric transmittance in the medium-wave band and the theoretical calculation is 5.77%;thus the method is verified.