CALCULATION OF PERMISSIBLE ERRORS OF THE 3D SCANNER CHANNELS WHEN MEASURING THE SURFACE SHAPE OF THE MILLIMETRON OBSERVATORY MIRROR SYSTEM IN THE ORBITAL OPERATION MODE
S.N. Makarov1, M.F. Stupak1, D.A. Ovchinnikov2, J.A. Oberemok2
1Technological Design Institute of Scientific Instrument Engineering, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Academician M.F. Reshetnev Information Satellite Systems, Zheleznogorsk, Russia
Keywords: mathematical model, mirror system of the "Millimetron" observatory, control system, numerical modeling, control marks, 3D scanner, measurement error
Abstract
On the basis of the previously developed mathematical model and algorithms for functioning of the mirror system control system of the Millimetron Observatory, the results of numerical simulation of obtaining permissible values of the errors of the on-board 3D scanner during the preliminary measurement of the geometric parameters of the spatial location of the mirror system of the Millimetron Observatory using optical control marks on the surface of the mirror system are presented. When modeling the measurement of the geometric parameters of the spatial arrangement of the control marks, two options for their execution on the panels of the main mirror of the telescope are considered: Option 1 - the control marks are given in the form of mirror spheres with a diameter of 10 mm, located at the four corners of the panels of the main mirror; Option 2 - the control labels of Option 1 are complemented with miniature swivel mirrors. The miniature mirrors allow the measuring beam to be rotated so that through the mirror it is possible to measure the geometric parameters of the control marks located on adjacent (for mirrors) panels of the main mirror. It is revealed that, when the permissible values of errors in the operation of the 3D scanner are reached (9 μm for the rangefinder channel and 2 angular sec for the angle channels) and combined control marks are used (option 2), it is potentially possible to build a device for pre-tuning the mirror system.
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