The paper presents an analysis of designing an optical-electronic imaging system designed to operate in a turbulent atmosphere. The optoelectronic system design is based on hill-climbing and phase conjugation technique using a bimorph adaptive mirror and a Shack-Hartmann-type wavefront sensor. The system corrects the wavefront distortion of the laser radiation passing through the test object and an inhomogeneous medium that simulates a turbulent atmosphere. Criteria for restoring the geometric characteristics of the test object are analyzed using the proposed hybrid algorithm, including spatial-frequency analysis of the recorded spectrum.
A high-quality flat wavefront is usually used to calibrate the Shack-Hartmann wavefront sensors. The article discusses the possibility of calibrating sensors with spherical wavefronts. Special attention is paid to the consideration of calibration in standard laboratory conditions. The mathematical apparatus and the scheme of the experiment are considered. A statistical analysis of the calibration accuracy of the Shack-Hartmann wavefront sensor is carried out. Spherical wavefronts from a point source were used as references. As a result, the parameters of the wavefront sensor were determined: the focal length and the dimensions of the digital camera pixel. This calibration method is considered in comparison with the traditional calibration using flat wavefronts.
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