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Method and apparatus for measuring cofocal combined ultra-long focal distance

A measurement method and a technology of a measurement device, which are applied in the direction of testing optical properties, etc., can solve problems such as ultra-long focal length fixed focus that have not yet been seen, and achieve the effects of reducing the length of the measurement optical path, reducing the impact, and high stability

Inactive Publication Date: 2009-04-15
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

So far, there have been no reports on the direct application of this technology to ultra-long focal length fixed focus

Method used

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  • Method and apparatus for measuring cofocal combined ultra-long focal distance
  • Method and apparatus for measuring cofocal combined ultra-long focal distance
  • Method and apparatus for measuring cofocal combined ultra-long focal distance

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Embodiment

[0037] Such as image 3 As shown, a confocal combination ultra-long focal length measurement method, the measurement steps are:

[0038] First, turn on the light source 12, emit parallel light through the beam splitting system composed of the polarizing beam splitter 13 and the 1 / 4 wave plate 14, converge at the focus position a7 through the reference lens 5 with a focal length of 3000mm, and the light is reflected by the reflector 8 , enter the confocal fixed-focus system through 1 / 4 wave plate 14 and polarizing beam splitter 13 reflections; Converging lens 21 in the confocal fixed-focus system converges the light, and the convergent light passes through the pinhole 20 illumination CCD detector 19; 8 Scanning and moving along the translation stage a15 in the direction of the optical axis of the reference lens 5, the confocal fixed-focus system determines the corresponding focus position a7 of the reference lens by detecting the maximum point of the response signal of the CCD ...

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Abstract

The invention belongs to the technical field of optical precision measurement, and relates to a method for measuring super long focal length of a confocal combination lens and a device thereof. The method is as follows: firstly determining the focal position of a reference lens and the focal position of the combination of the measured lens and the reference lens according to the confocal focusing principle, measuring the distance delta between the two focal points and the distance d0 between the two lenses, and substituting the delta and the d0 into a formula to calculate the focal length value of the measured lens, a pupil filtering technique can also be used in the measurement to enhance the sensitivity of focal length measurement. The invention proposes that accurate focusing is realized by the characteristics that an object corresponds to the microscope objective focus when the confocal point responds to the maximum curve value, and extends the confocal microscopy principle to the super long focal length measurement field, and proposes the confocal focusing principle. The method combines the confocal focusing principle with the combination lens method, has the advantages of high measurement precision and strong anti-environment interference ability, and can be used for high-precision focal length measurement during the detection and assembly of the super-long focal length lens.

Description

technical field [0001] The invention belongs to the technical field of optical precision measurement and can be used for high-precision focal length measurement in the process of detection and assembly of ultra-long focal length lenses. technical background [0002] In recent years, ultra-long focal length lenses have been widely used in large-scale optical systems such as high-energy lasers and astronomical telescopes. The processing, testing and assembly of such large-scale lenses are very difficult. As an important parameter of an ultra-long focal length lens, its focal length measurement has always been a difficult point in the field of optical measurement. The main factors are: small numerical aperture and long depth of focus make it difficult to achieve precise focusing; Susceptible to environmental disturbances. Therefore, traditional fixed-focus methods such as the magnification method or the pentaprism method are difficult to achieve high-precision measurement of u...

Claims

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Application Information

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IPC IPC(8): G01M11/02
Inventor 赵维谦邱丽荣孙若端沙定国
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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