Profilemetry measurement based on wavenumber scanning interferometry
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摘要: 为了高精度测量被测物体表面3维轮廓,采用半导体激光器波数扫描干涉的方法,对激光波数扫描干涉进行了理论分析和实验验证。在迈克尔逊干涉系统的参考端引入一个光楔,通过2-D傅里叶变换提取光楔干涉图像的相位,在线检测激光器输出波数变化,最后对所有时间分辨干涉图像序列进行随机采样傅里叶变换,还原被测物体表面3维轮廓。结果表明,轮廓测量精度达到6.7nm。该方法特别适合于机械零件的质量检验。Abstract: In order to measure 3-D profile of a sample with high accuracy, wavenumber-scanning interferometry was used. An optical wedge was used as reference terminal of a Michelson interferometer system. The phases of wedge interference image were extracted by 2-D Fourier transform. The changes of output wavenumber were detected on line. Finally, all the time-resolved interferometry image sequences were sampled by Fourier transform random. The 3-D contour of object surface was restored with high precision. The profile of a sample object was constructed with the resolution of 6.7nm. The proposed method is particularly suitable for quality inspection of mechanical parts.
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