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Manufacturing method of off-axis paraboloid with long focus and large off-axis magnitude

An off-axis paraboloid and manufacturing method technology, applied in the field of optics, can solve the problems of low detection accuracy and poor machining accuracy of the off-axis paraboloid with long focus and large off-axis amount

Active Publication Date: 2019-01-08
苏州如期光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the technical problem of poor machining accuracy caused by the low detection accuracy of the off-axis parabola with a large off-axis amount of the telephoto, and the technical solution adopted is as follows:

Method used

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  • Manufacturing method of off-axis paraboloid with long focus and large off-axis magnitude
  • Manufacturing method of off-axis paraboloid with long focus and large off-axis magnitude
  • Manufacturing method of off-axis paraboloid with long focus and large off-axis magnitude

Examples

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Effect test

Embodiment 1

[0034] Taking an off-axis parabolic mirror with a diameter of D1=Ф400mm, a thickness of 60mm, a back focal length of f=18m, and an off-axis distance of H=9m as an example, a detection optical path of a long-focus off-axis paraboloid with a large off-axis distance, such as Image 6 As shown, along the propagation direction of the light waves emitted by the interferometer 5 are arranged in sequence: a diverging lens 8, a standard spherical reflector 6, and a standard plane reflector 7. The divergent lens modulates the light waves emitted by the interferometer into a divergent spherical surface The divergent spherical wave is reflected by the standard spherical mirror and incident on the measured telephoto large off-axis paraboloid 1, and the light wave reflected by the measured telephoto large off-axis paraboloid is a plane wave, and the plane wave is vertical Return to the original path after incident on the standard plane mirror;

[0035] The standard spherical reflector and t...

Embodiment 2

[0041] combined with figure 1 , taking an off-axis parabolic reflector with a processing diameter of D1=Ф400mm, a thickness of 60mm, a back focal length of f=18m, and an off-axis amount of H=9m as an example, a manufacturing method of a telephoto off-axis paraboloid with a large off-axis amount:

[0042] Step 1: Design the off-axis two-mirror inspection system according to the parameters of the off-axis parabolic mirror, and use the ZEMAX program to optimize the design and obtain the optical path diagram as follows Figure 7 , it can be seen from the figure that the deflection angle θ1=14.9575°, the deflection angle θ2=-10.334°, the radius of the standard spherical mirror is R2=21650±300mm, the distance between the two mirrors is about d1=2500mm, the standard spherical mirror The image point distance from the center of the reflector to the two mirror systems is about d2=7500mm, the diameter of the standard spherical reflector is D2=Ф385mm, and the system image square F / # is F / ...

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Abstract

The invention belongs to the technical field of the optical processing, and specifically relates to a manufacturing method of an off-axis paraboloid. For solving the technical problem that the processing precision is bad since the off-axis paraboloid with long focus and large off-axis magnitude is low in detection precision, the invention provides a manufacturing method of the off-axis paraboloidwith long focus and large off-axis magnitude. The manufacturing method comprises the following steps: superposing divergent lens virtual focuses and image points of an off-axis two-mirror system by adopting the off-axis two-mirror system, thereby effectively shortening light path length; and further shortening the light path length and compressing light path width by cooperating with a standard spherical reflector and a standard plane reflector; furthermore, image elements of a CCD are effectively utilized through the technical scheme, the detection resolution of a detected workpiece is increased, and the bad influence on a checking result by the air disturbance can be effectively contained, the interference checking precision is improved, and the guarantee for processing the off-axis mirror meeting the technical requirement is provided.

Description

technical field [0001] The invention belongs to the field of optical technology, and in particular relates to a method for manufacturing an off-axis paraboloid. Background technique [0002] Due to the loss of rotational symmetry, the off-axis parabolic mirror cannot be processed and ground on the mirror grinding machine according to the traditional method. It is generally believed that if high-precision single-piece machining of off-axis parabolic mirrors is desired, only computer-aided machining methods can be used. That is, it must rely on complex numerical control optical processing equipment. Nowadays, the digging and cutting technology is generally adopted. First, a large rotationally symmetrical parent parabolic mirror is made, and then the required part is dug out with a set cutting tool. This method can only be applied to mirrors with small aperture and small off-axis. [0003] Off-axis parabolic mirrors mainly have the following indicators: clear aperture, off-a...

Claims

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Application Information

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IPC IPC(8): G01B11/02G01B11/26G01B11/27G01B11/255G01B11/00
CPCG01B11/002G01B11/02G01B11/255G01B11/26G01B11/272
Inventor 胡建军潘君骅钱煜王伟
Owner 苏州如期光电科技有限公司
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