Abstract We present sub-aperture scanning Fourier transform system, a method for fast Bidirectional reflection distribution function (BRDF) measurements. A single lens is used for Fourier transform, and the scattering light field is measured by sub aperture scanning of the Fourier transform lens. Through Fourier transform, a single measurement can obtain multi-angle scattering data, and sub-aperture scanning further expands the measurement angle range. Due to the full utilization of image detectors, once measurement can get 1944 points’ data inside 10°. Thus the system’s precision can get to 0.005°and the measurement time can shorten ten times. Finally, the method is verified by comparing the experimental data. Experimental results show that the relative error of this method is less than 1%. These results provide theoretical basis and technical support for the application of BRDF in sub aperture scanning Fourier transform system.

中文翻译：

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散射光测量子孔径扫描傅里叶变换系统的建立与验证

摘要 我们提出了子孔径扫描傅里叶变换系统，这是一种快速双向反射分布函数 (BRDF) 测量方法。采用单透镜进行傅里叶变换，通过傅里叶变换透镜的子孔径扫描来测量散射光场。通过傅里叶变换，单次测量可以获得多角度散射数据，子孔径扫描进一步扩大了测量角度范围。由于图像探测器的充分利用，一次测量可得到10°以内1944个点的数据。这样系统的精度可以达到0.005°，测量时间可以缩短十倍。最后，通过对比实验数据对该方法进行了验证。实验结果表明，该方法的相对误差小于1%。