Determining the inclination of a diffusing surface with regard to viewing direction by speckle photography

摘要

A speckle-pattern image method is used to determine the inclination with regard to viewing direction of a diffusing flat surface. We recorded on a photographic plate a defocused double exposure image, illuminating along the viewing direction with two neighbouring wavelengths. In the experiments we have used, too, diffusing plane dihedrons illuminated in this way. Good agreement with the equation founded is observed. © 1978.