An optical lens focal length measuring device and method
A technology of optical lens and measuring device, which is applied in the field of aerospace optical remote sensing, can solve problems such as difficult to guarantee measurement accuracy and cumbersome operation, and achieve the effect of reducing operation difficulty and risk and improving measurement accuracy
Active Publication Date: 2019-07-12
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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[0004] The technical problem of the present invention is: to overcome the deficiencies of the prior art, to provide an optical lens focal length measurement device and method, to solve the existing large-diameter telephoto optical lens focal length measurement method, which is cumbersome to operate and difficult to guarantee measurement accuracy, etc. question
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[0018] Such as figure 1 Shown is a schematic diagram of the device of the present invention, including an interferometer 1, a standard spherical mirror 3, a photoelectric autocollimator 4, a laser tracker 5 and a data processing unit. The optical lens 2 wavefront test optical path that interferometer 1, optical lens 2 and standard spherical reflector 3 are built is the basic optical path that uses the method of the present invention to carry out focal length measurement, and standard spherical reflector 3 is placed on optical lens 2 image square focus theoretical positions ; The interferometer 1 emits parallel light to the optical lens 2, the optical lens 2 converges the parallel light at the focus position of the image side, the standard spherical reflector 3 reflects the converged light, and the interferometer 1 receives and is reflected by the standard spherical reflector 3 and passes through the optical The light of the lens; the photoelectric autocollimator 4 and the lase...
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Disclosed are a device and method for measuring the focal length of a large-aperture telephoto optical lens. The device includes an interferometer, a standard spherical reflector, a photoelectric auto-collimator, a laser tracker, and a data processing unit. A test light path is adjusted so that the optical axis of an optical lens is parallel to the parallel light emitted by the interferometer. Thesmall-aperture standard spherical reflector is placed at the theoretical position of an image focal point, the standard spherical reflector is adjusted to the actual position of the image focal point, and the laser tracker measures the spatial position of the standard spherical reflector. The interferometer is deflected, the deflection angle is measured, the standard spherical reflector is adjusted to the actual position of the image focal point, and the spatial position of the standard spherical reflector is measured with the laser tracker. The data processing unit calculates the focal length of the optical lens based on the deflection angle of the interferometer and the amount of change in the spatial position of the standard spherical reflector. The device and method in the invention can be used for focal length measurement of large-aperture telephoto optical lenses with different wavelengths, and have very important applications in the installation and testing of space optical remote sensors.
Description
technical field [0001] The invention relates to a measuring device and method for the focal length of a large-caliber telephoto optical lens, and belongs to the technical field of aerospace optics and remote sensing. Background technique [0002] In technical fields such as optical measurement and remote sensing mapping, high-precision optical lenses are inseparable. As one of the most important parameters of optical lenses, focal length is involved in the calculation and processing of key data such as target size and distance after image acquisition, so it is very important to ensure the accuracy of focal length measurement. [0003] At present, the focal length measurement of optical lenses at home and abroad mainly uses the magnification method, the precision angle measurement method, the Fourier spectrum analysis method and the Tabermore method. The magnification method has high requirements on the accuracy of the engraved line of the Perot and the focal length of the c...
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IPC IPC(8): G01M11/02
CPCG01M11/02
Inventor 黄阳王春雨王聪牛锦川张生杰贾馨宗肖颖张建国赵英龙岳鹏远赵希婷冀翼
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH