Large-caliber long-focus collimator focal point real-time monitoring system

Abstract

The invention relates to a large-caliber long-focus collimator focal point real-time monitoring system. A laser device of the system emits laser beams, and the laser beams are divided into two bunches of lasers through a laser beam splitter. The two bunches of lasers pass through a slit after being reflected by a semi-reflecting and semi-transparent lens, and then are reflected to a main lens of the collimator through a reflecting lens. The two bunches lasers reflected by the main lens are reflected four times in turnover mode by two pentaprisms, and then are reflected back through the main lens. The two bunches lasers pass through the slit again after being reflected by the reflecting lens, and pass through two sets of dialyte lenses behind the semi-reflecting and semi-transparent lens and are converged on a charge coupled device (CCD). A processor calculates the distance between two faculaes according to image data received by the CCD, and then size and direction of defocusing amount can be obtained. An emitting light path and a receiving light path are in the same plane, and relative positions of elements are easy to guarantee when the large-caliber long-focus collimator focal point real-time monitoring system is mounted so as to reduce mounting and adjusting difficulty of the whole system.

Description

technical field [0001] The invention relates to a real-time monitoring system for the focal point of a collimated light tube with a large diameter and a long focal length. Background technique [0002] As humans continue to explore the depths of space, space optics has been greatly developed. Various large-scale space telescopes and space cameras emerge in endlessly, and their apertures are also getting larger and larger, such as: the Hubble telescope with an aperture of 2.4 m, and a single aperture of 8.4 m. m LBT telescope, 6.5 m James space-based telescope, and 25 m GMT ground-based telescope. Therefore, the large-aperture detection system is more and more widely used in the scientific research work of calibration and detection, and its core equipment is a large-aperture collimator. However, as the aperture of the collimator becomes larger and the focal length becomes longer, the process of adjusting and calibrating the collimator becomes very cumbersome, and its image q...

AI Technical Summary

Problems solved by technology

Although this method is simple, it cannot fully simulate the complexity of the real environment, and the accuracy is not enough.

[0006] 3) Image processing method: by evaluating and processing the blurred image formed by the system when the system is out of focus, the defocus amount of the system at that time is calculated. Although this method has high real-time performance and good accuracy, it is only suitable for transmission-type spaces Imaging systems such as cameras or microscopes

The system’s emitting light path and receiving light path are not in the same plane, the system light source and the CCD as a photoelectric conversion device will occupy two positions of the focal plane of the space camera at the same time, and considering that the structure of the space camera is relatively compact and there are many measurement sensors , so it is more difficult to install and adjust on the basis of ensuring that it does not block or hinder the space camera's own structure, and it is more difficult to check the focus in real time on orbit

Since the test environment has a great influence on the space camera, and the article did not mention the environmental parameters during the test and the repeatability of the distance measurement between the two slit images, the measurement data and measurement accuracy in the article may be due to systematic errors or Influenced by environmental factors, it is not accurate enough and perfect

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