ISSN 0021-3454 (print version)
ISSN 2500-0381 (online version)
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8
Issue
vol 63 / August, 2020
Article

DOI 10.17586/0021-3454-2020-63-6-538-547

UDC 535.3, 519.718

RELIABILITY OF ADAPTIVE OPTICAL SYSTEM OF TILT CORRECTION

A. V. Chernykh
Russian Federal Nuclear Center All-Russian Research Institute of Experimental Physics;


Y. I. Shanin
LUCH Research and Production Association, Research and Development Institute;


Abstract. Laser installation of continuous action is included in an adaptive optical system (AOS) intended for ensuring the required spatial characteristics of the laser beam wave front (WF). The AOS contains two active mirrors: a) the tilt corrector (TC) eliminating the slopes of WF and of the laser beam jitter (corrects about 84 % of WF aberrations), and b) the deformable mirror (DM) eliminating higher orders of the WF aberrations. Control loop of the TC considered in the paper includes tilt corrector, tilt sensor, amplifying unit with a special calculator to generate TC control signals. From the point of view of ensuring dependability in the most difficult conditions, the tilt corrector works. The least dependable in the tilt corrector are piezoelectric actuators subject to cyclic variable electromechanical loads. Technical solutions for control loop of the tilt corrector are analyzed and the reliability requirements are formulated. As a result of the analysis, the critical failures of TC are indicated: reduction in transmitted bandwidth and a loss of compensation ca Надежность адаптивной оптической системы коррекции наклонов 547 ИЗВ. ВУЗОВ. ПРИБОРОСТРОЕНИЕ. 2020. Т. 63, № 6 pabilities. Several issues related to reliability of the AOS elements – drives, TC, control unit, tilt sensor – are considered. A block diagram of the AOS TC is presented and the integrated reliability ratio – the instantaneous operating availability – is evaluated. Reliability of the developed AOC TC elements is confirmed by calculated estimates and presented results of experimental tests of the most critical elements. The developed elements of the control loop TC are shown to meet the imposed requirements.
Keywords: adaptive optical system, deformable mirror, tilt corrector, laser installation, tilt sensor, piezoelectric actuator, amplifying unit, reliability, instantaneous operating availability coefficient

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