Indoor detection method of wave aberration under different elevation angles of large-aperture photoelectric detection system

Abstract

The invention relates to an indoor detection method of wave aberration under different elevation angles of a large-diameter photoelectric detection system. On the detection optical path, there are sequentially arranged: a target plate and an illumination system; a small-diameter collimation optical system with a variable aperture; the first A deflection beam-splitting prism; a second deflection beam-splitting prism; a third deflection beam-splitting prism in the measuring head; a first beam-splitting prism in the measuring head; a second beam-splitting prism; a first photoelectric autocollimator; Three beam splitting prisms; second photoelectric autocollimator. The indoor detection method of the wave aberration at different elevation angles of the large-aperture photoelectric detection system of the present invention is mainly used for the wave aberration detection of the large-aperture photoelectric detection system at different elevation angles, and can realize the quantitative evaluation of the imaging quality and its stability at different elevation angles.

Description

technical field [0001] The invention belongs to the field of optical detection and optical measurement, in particular to an indoor detection method of wave aberration under different elevation angles of a large-diameter photoelectric detection system. Background technique [0002] With the continuous increase of the aperture of the main optical system in the ground-based photoelectric detection system, the change of the elevation angle of the large-aperture main optical system during the tracking and imaging process of the photoelectric detection system will have a greater impact on the stability of its optical performance. Relevant simulations and experiments show that when the aperture of the optical system is close to 3m, the surface shape change caused by the elevation angle changing from horizontal (0°) to zenith (90°) is about λ / 11 (RMS, λ=632.8nm), The defocus caused by the change of elevation angle exceeds 17mm, and the dynamic pointing error of the optical axis exce...

AI Technical Summary

Problems solved by technology

At present, the above-mentioned sub-aperture slope sampling measurement principle is limited by the sampling density and system configuration, and it still cannot completely replace the full-aperture interferometric detection or outdoor star detection. Its current main limitations include:

[0004] (1) It is difficult to control the tilt error in the sub-aperture scanning process. Most of the current technical ideas passively reduce the error by improving the motion accuracy and positioning accuracy of the mechanical scanning system.

As a result, the size and weight of the instrument have increased significantly

However, limited by the cumulative sampling error caused by this, it is difficult to increase the sub-aperture sampling density, and the suppression residual of the sub-aperture tilt error still does not meet the accuracy requirements of wavefront reconstruction.

[0005] (2) During the sub-aperture scanning process, due to the influence of environmental errors such as airflow disturbance and non-equal-phase vibration, there are random measurement errors in the sub-aperture slope, which is equivalent to adding a random error background to the final reconstructed wavefront. The middle and high frequency parts in the previous information bring large measurement errors

[0006] (3) In order to ensure the scanning accuracy, most of the current measurement devices are bulky and heavy, and it is not easy to use them at different elevation angles, and their flexibility and applicability are poor.

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