Optic-electronic systems for measuring the angle deformations and line shifts of the reflecting elements at the rotateable radio-telescope

Abstract

The construction of the large size radiotelescope for the millimetre wave range requires measuring the line deformation of mirror's surface and the angle deviations of the mirror axles. Following issues dealing with this problem are described in this article: 1) the design of the angle deformation measurement system on the base of the autocollimation method; 2) the autoreflection scheme as the new type of the optic-electronic autocollimator; 3) the design of the line deformation measurement system on the base of the triangular method. The great attention during the research was paid to the experimental approval of the theoretical results. The parameters of the experimental setups are: infrared emission diode AL107B by power 15 mWt as sources of radiation; the objective by the focal length 500 mm as aperture of receiver video-camera, the CMOS matrix receiver by type OV05620 Color CMOS QSXGA with 2592*1944 pixels and one pixel size (2.2*2.2) μm2 produced by OmniVision as image analyzer. The experimental error of the angle measuring system is 1.6 arc. seconds at the angular region 16 arc. minutes for 22 m distance. The experimental error of the line measurement is 0.15 mm at the range 30 mm on a working distance 18 m. This result allows the practice measuring of the construction deformations for the new large rotateable radio telescope RT-70 Suffa.