A kind of automatic focusing method and radiometer system of day and night stellar radiometer

Abstract

The present invention relates to the technical field of radiometer automatic focusing, in particular to a day and night star radiometer automatic focusing method and a radiometer system. The method includes the following steps: S1. The control module obtains the relationship between the focal length f of the corresponding telescope and the temperature T Formula; S2. The control module receives the temperature T detected by the temperature sensor, and the control module controls the camera on the focusing mechanism to directly move to the focal length position corresponding to the current temperature according to the relational formula obtained in step S1. The advantage of this invention is that the present invention directly adjusts the camera to an accurate position by obtaining the relationship between the focal length f of the corresponding telescope and the temperature T, so that the device can always image stars at the focal plane at different ambient temperatures, avoiding Manual intervention is reduced, labor intensity is reduced, and the automation level of equipment is improved.

Description

technical field [0001] The invention relates to the technical field of automatic focusing of radiometers, in particular to a method for automatic focusing of day and night star radiometers and a radiometer system. Background technique [0002] When the stellar radiometer detects the intensity of starlight for a long period of time, the ambient temperature changes day and night, the ambient temperature changes throughout the year, and the ambient temperature differences in different regions of the country. These large temperature differences cause significant thermal expansion and contraction of the lens barrel material. The phenomenon causes the equivalent focal length of the optical imaging system to change, and the change of the equivalent focal length prevents the device from always imaging starlight at the focal plane of the optical imaging system, and eventually the telescope imaging will produce obvious defocus problems. The disadvantages of imaging defocus to equipmen...

AI Technical Summary

Problems solved by technology

[0003] 1. The decrease of imaging signal-to-noise ratio causes the statistical error of starlight imaging intensity to increase, which causes the measurement error of transmittance to increase

[0004] 2. The designed operating temperature range of the day and night stellar radiometer is -40°C to 60°C, and the range of ambient temperature changes throughout the year exceeds 40°C, and the temperature range of the equipment working under the sun is larger; large-scale temperature changes will cause imaging blur. When working in daytime, due to the interference of the sky background, it is difficult to judge the imaging position of the star on the detector even if the star has entered the imaging field of view of the equipment.

The atmospheric transmittance cannot be accurately measured if the imaging is slightly out of focus

In practical applications, there is a lack of an effective method to automatically adjust the optical system for the single-aperture telescope defocus problem caused by real-time temperature changes

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