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摘要: 发展了固定腔结构的角色散FP干涉测速系统,干涉仪结构紧凑,采用固定腔标准具,实现了干涉 条纹永久免调,并且条纹常数的标定非常简单。该系统可用于靶面反射光强动态变化很大的场合,在电炮驱 动Mylar膜飞片实验中,光强变化达100倍时仍然获得了很好的结果。分析了标准具厚度误差、标准具端面 不平行、干涉条纹动态展宽和扫描图像畸变等因素对系统测量精度的影响以及系统的速度和时间分辨能力。Abstract: Afixed-cavityangulardispersionFabry-Perotvelocityinterferometerwasdevelopedbyapplyingasolidetalontorealizethatthisinterferometer'sstructurewascompact, theinterferencefringesobtainedbyitwereadjustment- freeanditsfringeconstantcouldbeeasilyandaccuratelycalibrated. Thisinterferometerwasusedintheexperimentwithanelectricguntoacceleratea10-mm-diameter, 0.25-mm-thickMylarflyer.Theinterferometergavegoodresultsevenwhentheintensityoflight reflectedfromthetargetchanged100times.Themeasurementaccuracyofthesystem wasanalyzed bytakingaccountofetalonthicknesserror,unparalleletalonsurfaces,fringebroadening,imageaberration, andsoon.Andthevelocityresolutionandthetemporalresolutionwerealsoanalyzed.
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