Chan

This paper describes the results of investigations which can be used for developing devices for high-accuracy measurement of transverse objects’ movement distance to which can vary significantly. In order to tackle this problem one can use the method based on measuring the location of a test optical signal projected onto the surface of the object by an afocal optical system. With the use of a mathematical model of the afocal optical system under the conditions of coherent illumination the influence of its parameters on distribution of intensity in the image with defocusing was analyzed. It was shown that a combination of parameters of the afocal optical system could be selected in such a manner that distribution of intensity in the image doesn’t depend on defocusing.