风场探测干涉仪中基准光程差的选择原理

The Selective Principle of Fixed Optical Path Difference of Wind Measurement Interferometer

为了确定风场成像干涉仪(WindImagingInterferometer,WINDII)中存在的基准光程差的值,首先从风场探测机理出发,分析了影响基准光程差的因素.针对WINDII分别从调制度、相位及相近谱线同相的要求三个方面加以剖析,依次获得了它们与基准光程差之间的定量关系.综合考虑三个条件的要求,最终得出了基准光程差的选择原理.并用此理论对几种不同的风场成像干涉仪的基准光程差值进行了验证.

In order to principle of wind field determination fixed optical path difference of wind imaging interferometer, the measurement is described. The factors which influence on fixed optical path difference are analyzed. Three requirements including visibility ,phase and near spectral lines in phase for WlNDII（Wind Imaging Interferometer）are analyzed respectively and obtain quantificational relations between them and fixed optical path difference. Three conditions are considered together and conclude the selective principle of fixed optical path difference. At last the theory is applied to other wind imaging interferometers and proves their fixed path differences.