| Large-aperture opto-electronic device,with important application value,has the advantages of strong detection ability,long range and high resolution.So it has important applications in the fields of astronomy,military,space target measurement,system monitoring and scientific research.However,limited by the optical principle,surrounding environment and the complexity of the design of devices,the use of large-aperture opto-electronic device is cumbersome.Therefore,to achieve the extreme application of the device,there are many technical bottlenecks,among which focusing technology is one of them.And under the current application requirements,under the condition of little or no human intervention,the precise focusing design can not only give full play to the advantages of large-aperture opto-electronic device such as long detection distance and clear image details,but also avoid its disadvantages of complicated equipment operation and easy to be affected by the surrounding environments.Therefore,autonomous focusing technology is one of the research focuses of large-aperture opto-electronic device.This paper mainly focuses on the research of the auto-focusing technology of large aperture opto-electronic device,analyzes the imaging principle,the reason of defocusing,and the accurate establishment and verification of focusing model of large aperture opto-electronic device.The main research work of this paper is divided into the following three parts:1.Firstly,analyze the imaging principle and the reasons for defocusing of large-aperture opto-electronic device,and explain the effect of the depth of field in the optical system on focusing;2.Secondly,a new focusing model is proposed to solve the problem that the complex working environment of large aperture opto-electronic device leads to the inaccurate focusing of optical system.Based on the temperature and focal length data of a meter telescope of Yunnan Observatory,a temperature focusing model based on Fourier series is established.Combined with the distance focusing model,the focusing precision of large aperture opto-electronic device is greatly improved.3.Finally,the experiment is carried out by using the optical system of a large-aperture opto-electronic device.Through the analysis of experimental data,the accuracy of the comprehensive model is verified. |
