Focal length measuring method based on star ground observation system

Abstract

The invention provides a focal length measuring method based on a star ground observation system, relates to the technical field of imaging instrument focal length measurement, and solves the problem that a one-dimensional spatial information slot-type imaging spectrometer cannot carry out field focal length measurement easily. The method comprises the steps of: calibrating an equatorial telescope polar axis, starting a star tracking system, utilizing an equatorial coordinate system of the equatorial telescope and the change relation between star signals and the visual field position in the instrument to carry out fine tuning on the slot height direction of the imaging spectrometer so as to enable the slot height direction to be perpendicular to a declination axis of the equatorial telescope, utilizing a high-precision equatorial coordinate control system of the equatorial telescope to use stars in the universe as point light sources, and rotating a fixed angular distance in the spatial dimension of the imaging spectrometer so as to calculate the focal length of the optical system. The star ground observation system is mainly composed of the equatorial telescope, an astronomical telescope and the imaging spectrometer, the measuring structure is simple, and the precision and efficiency of focal distance measurement are effectively improved by the usage of the equatorial telescope.

Description

technical field [0001] The invention relates to the technical field of imager focal length measurement, in particular to a focal length measurement method based on a stellar ground observation system. Background technique [0002] The focal length is one of the most important optical characteristic parameters of optical components and optical systems. The accurate measurement of the focal length directly affects the full play of the technical performance of the optical instrument in the actual application process. There are many methods for measuring focal length, such as displacement method, magnification method, precision angle measurement method, grating method, Abbe method, etc., but these traditional focal length measurement methods are difficult to meet the complex environmental conditions in the field, and for the ground-based astronomical observation system For focal length measurement, the diameter of a binary star system or celestial body in the universe is often u...

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Problems solved by technology

There are many methods for measuring focal length, such as displacement method, magnification method, precision angle measurement method, grating method, Abbe method, etc., but these traditional focal length measurement methods are difficult to meet the complex environmental conditions in the field, and for the ground-based astronomical observation system For focal length measurement, the diameter of a binary star system or celestial body in the universe is often used to measure the focal length. For example, a method for accurately measuring the focal length of an optical system based on lunar imaging (patent CN103792069A) is to calculate the focal length of the telescope system through the diameter of the moon, but This type of measurement method is not suitable for imaging spectrometer systems with only one-dimensional spatial information. Therefore, it is necessary to study a new method for field measurement of focal length, so that it has the characteristics of strong applicability, simple operation, and high-precision measurement.

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