We propose the design aimed at determining the coordinates or the value of the transverse displacement of image of a point source. This is a two-channel optical-electronic device that uses the proportionality of analogous signal at the output of each channel to the X- and Y- coordinates of the point source image. In any respect, this appears to be more effective as compared with the registration of images by means of a 2-D matrix photodetector. Optical setup for the device is shown in Fig. 1. The coherent light source illuminates a spherical lens behind which a computer generated optical element (CGOE) is placed. This optical element is calculated in such a way that the image of the point source be characterized by the intensity distribution in the form of a cross. The image intensity is registered through the use of two linear photosensors located perpendicular to each other (see Fig. 2). As linear photosensors (the length 10 mm), one can use silicon semi-conducting structure of the Multiscan type (prodused by Technoexan, Russia) whose output analogous signal is realized in the form of the voltage variations proportional to the distance of the initial point of the photosensor to the point of the maximum intensity of the linear photosensor. The variation of the voltage by 0.1 mV is equivalent to the displacement of the maximum light intensity along the photosensor by 0.2 p, m.

Date Published: 23 July 1993
PDF: 2 pages
Proc. SPIE 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 1983BP (23 July 1993); doi: 10.1117/12.2308840

Published in SPIE Proceedings Vol. 1983:
16th Congress of the International Commission for Optics: Optics as a Key to High Technology
Gyorgy Akos; Tivadar Lippenyi; Gabor Lupkovics; Andras Podmaniczky, Editor(s)