Electrooptic Converter for Measuring Linear Shifts of the Section Boards at the Main Dish of the Radiotelescope

Abstract

The article analyzes the construction matters and metrological parameters of the electrooptic converter to generate SEMS control signals at shifting the structure elements of adaptive surface. The parallel structure of SEMS is used. Converter measures the shifts of section boards at the adaptive surface of radiotelescope main dish. The converter includes the base module, the processing module and a set of the reference marks. The base module includes the receiving optical system and the CMOS photodetector. The methods of the frame-to-frame difference, adaptive threshold filtration, binarization and objects search by the tied areas to detect the marks against accidental contrast background is the basis of the algorithm. The developed and manufactured converter experimental model was tested in laboratory conditions at the metrological bench at the distance between the base module and the mark 50 ± 0.2 m. The static characteristic was read during the experiment of the reference mark displacement at the pitch of 5 mm in the horizontal and vertical directions for the displacement range 40 mm. The error of the experimental model converter not exceeding 0.2 mm was obtained in the result of the experiment.