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Method for non-contact measuring center to center distance of lens optical surfaces and measuring device

A technology of optical surface and center distance, applied in the field of optical measurement, can solve the problems of cumbersome operation and heavy workload, and achieve the effect of simple data processing and high measurement accuracy

Inactive Publication Date: 2012-06-13
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

This measurement method realizes non-contact measurement, but it still has many defects: the focus positioning of the standard lens is realized by adjusting the bending degree of the interference fringe, and the adjustment process is cumbersome, the workload is large, and a large human error is introduced

Method used

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  • Method for non-contact measuring center to center distance of lens optical surfaces and measuring device
  • Method for non-contact measuring center to center distance of lens optical surfaces and measuring device
  • Method for non-contact measuring center to center distance of lens optical surfaces and measuring device

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0040] like figure 2 As shown, the device of the present invention includes a broadband light source 1, a fiber coupler 2, polarization controllers 3, 4, a phase modulator 5, an optical delay line 6, a sample scanning device 7, a photodetector 8, a low-noise preamplifier 9, Data acquisition card 10, computer 11.

[0041] The measurement device adopts a fiber-optic Michelson interference structure. The light emitted from the broadband light source 1 is split by the fiber coupler 2 and enters the reference arm and the sample arm respectively. The way into the reference arm passes through the polarization controller 3, the phase modulator 5, and the optical delay line 6 in turn. The optical delay line 6 is a Rapid Scan Optical Delay Line (RSOD) in the spectral domain. Straightener 12, diffraction grating 13, Fourier lens 14, scanning galvanomet...

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Abstract

The invention relates to a method for non-contact measuring the center to center distance of lens optical surfaces and a measuring device. In the invention, emergent light form a wideband light source generates an interfere signal through an interference structure; two-dimensional chromatography images of the optical surfaces in the lens can be obtained through the sampling and image reconstruction for the interference signal; a thin parallel light beam is used in a sample arm as a scanning light beam, the starting position of the related chromatography imaging can be changed through moving an optical fiber collimating device, and further the characteristic images of all the optical surfaces with different depth in the lens can be obtained; and finally, the center to center distance between the two optical surfaces can be obtained as per the positions of the optical surfaces in the characteristic images and the moving distance of the imaging starting position. The invention has the advantages of non-contact nondestructive measurement, high measuring accuracy and simplicity in data processing, and can be widely applied in the fields such as optical processing, optical alignment and optical detection.

Description

technical field [0001] The invention belongs to the field of optical measurement, and in particular relates to a non-contact measuring method and a measuring device for the distance between the centers of optical surfaces in a lens. Background technique [0002] The calibration of the optical system, especially the calibration of the objective lens, directly affects the imaging quality and performance of optical instruments, and is a very critical process. The calibration process of the objective lens mainly has three requirements: 1) correct the eccentric error of each surface; 2) ensure the air gap; 3) ensure that the mirror surface is not deformed under the premise of firm installation. The measurement and control of the air gap is one of the key processes in the production of objective lenses. If the air gap cannot be strictly controlled, it will cause spherical aberration, chromatic aberration and affect the focal length, magnification, etc., and even seriously affect ...

Claims

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Application Information

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IPC IPC(8): G01B11/14G01B11/06
Inventor 史国华王志斌张雨东
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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