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Roughness measurement using threshold angle of image formation

机译：使用成像阈值角度进行粗糙度测量

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摘要

When the emitted light from a small object illuminates a rough interface, the image of the object is formed in reflection if the incident angle of the light is larger than a threshold angle. The threshold angle is the angle beyond which the specularly scattered light acquires a coherent component. The threshold angle depends on interface roughness and light wavelength. In transmission mode, the incident angle on the rough interface has an upper limit for image formation. The latter angle depends also on the refractive indices of the media surrounding the rough interface. We have determined the threshold angles and corresponding roughness for three different wavelengths using rough sheet-glass surfaces that were prepared by grinding sheet-glass surfaces by powders of different grain size. The roughnesses obtained by this method are in good agreement with those obtained by other methods. Our experimental studies also show that the threshold angle is practically independent of the illumination intensity. The presented method has the potential to be used in process measurement due to simplicity of the required optical system.
机译：当从小物体发出的光照亮粗糙的界面时，如果光的入射角大于阈值角，则物体的图像会反射形成。阈值角是镜面散射光获得相干分量的角度。阈值角度取决于界面粗糙度和光波长。在透射模式下，粗糙界面上的入射角具有图像形成的上限。后一个角度还取决于粗糙界面周围介质的折射率。我们使用粗糙的平板玻璃表面确定了三种不同波长的阈值角和相应的粗糙度，该平板玻璃表面是通过用不同粒度的粉末研磨平板玻璃表面而制备的。通过该方法获得的粗糙度与通过其他方法获得的粗糙度非常一致。我们的实验研究还表明，阈值角实际上与照明强度无关。由于所需光学系统的简单性，所提出的方法具有在过程测量中使用的潜力。

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