23 July 1993 Visibility as a mean to partially correct defocus
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Proceedings Volume 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology; 1983BP (1993) https://doi.org/10.1117/12.2308840
Event: 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 1993, Budapest, Hungary
Abstract
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.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
H. Rabal, H. Rabal, } "Visibility as a mean to partially correct defocus", 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; https://doi.org/10.1117/12.2308840
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