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Measuring device and method for measuring optical uniformity of optical glass

A technology of optical uniformity and optical glass, applied in the field of optical glass inspection, can solve the problems of high measurement cost and measurement difficulty, expensive interferometer, complex measurement process, etc. effect of the program

Active Publication Date: 2016-08-10
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing interferometer is expensive and the measurement cost is high; when measuring by interferometry, the surface of the optical glass sample to be tested needs to be polished, coated with refraction liquid, or pasted with a plate to avoid the formation of interference fringes caused by the rough surface of the sample phenomenon, the measurement process is complicated, the measurement cost and measurement difficulty are high

Method used

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  • Measuring device and method for measuring optical uniformity of optical glass
  • Measuring device and method for measuring optical uniformity of optical glass
  • Measuring device and method for measuring optical uniformity of optical glass

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Embodiment 1

[0025] like figure 1 and figure 2 As shown, the embodiment of the present invention proposes a measuring device for the optical uniformity of optical glass. The measured optical glass has a different refractive index due to stress. The measuring device includes a light source component 10, an interference color forming component 30, and a phase compensator (not shown in the figure), CCD camera 2 and computer 4. The light source assembly 10 is composed of a light source and a polarizer and / or other basic optical devices capable of forming polarized light, and is used to polarize the light source to provide polarized light; the interference color forming assembly 30 is composed of an analyzer or other capable of making the polarized light The optical device that produces interference after birefringence is configured to make the birefringent polarized light form an interference color; the phase compensator is used to make the polarized light generate different optical path dif...

Embodiment 2

[0040] An embodiment of the present invention provides a method for measuring the optical uniformity of optical glass, the method comprising:

[0041] Step 1: Measure and record the interference color images under each optical path difference after a polarized light undergoes birefringence, including:

[0042] The method adopts the measuring device provided by the above-mentioned embodiment to measure;

[0043] Before the measurement, first check whether the measuring device is normal. The measuring method is: turn on the light source 12, light passes through each optical device in the optical path in turn, shines on the CCD camera 2, and observe whether the interference color image taken by the CCD camera 2 is displayed on the computer 40 , if the image is displayed, it means that the device is normal and can be tested. If it is unrealistic, each device in the device can be fine-tuned until the interference color image is displayed on the computer 40;

[0044] Then, the phas...

Embodiment 3

[0054] With the method that embodiment 2 provides, measure the homogeneity of an optical glass, described optical glass to be tested causes refractive index difference by stress, and this optical glass size is 54mm * 19mm, and thickness is 20mm, image 3 In order to measure the contour map of the refractive index difference of the sample, Δn can be obtained from the measurement data i The maximum value is 4.9×10 -6 , Δn i The minimum value is -5.8×10 -6 , the difference between the two is 1.17×10 -5 Therefore, the optical uniformity of this sample is 1.17×10 -5 . Additionally, from image 3 It can be seen that Δn i The distribution gradient of , so that you can intuitively see the location of poor uniformity.

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Abstract

The invention relates to a measuring device and a measuring method for the optical uniformity of optical glass, and belongs to the field of optical glass detection. The optical glass has a different refractive index caused by stress. The measuring device includes: a light source component for providing polarized light; interference The color forming component is used to make the birefringent polarized light form interference color; the phase compensator is used to generate different optical path differences; the CCD camera is used to take interference color images; and the computer is used to obtain and process The interferometric color image. The measurement device of the present invention obtains the refractive index difference of each pixel by using the interference color image formed by the birefringence of the optical glass, thereby obtaining the optical uniformity of the optical glass. The device used in the device is a more commonly used optical device, which is simple and easy It is easy to obtain and low in cost; no special treatment is required on the optical glass surface during measurement, which simplifies the measurement steps and further saves costs.

Description

technical field [0001] The invention relates to a measuring device and method for optical uniformity of optical glass, belonging to the field of optical glass detection, in particular to a device and method for measuring optical uniformity of optical glass whose refractive index is different mainly due to stress. Background technique [0002] The optical uniformity of optical glass refers to the degree of inhomogeneity of the refractive index inside the same piece of glass. When there is an uneven distribution of elements or chemical bonds in the optical glass, the resulting chemical stress or structural stress will cause the refractive index at different positions of the optical glass to be different. Usually, the difference between the maximum refractive index and the minimum refractive index at each position of the optical glass is Δn Indicates the optical uniformity of the optical glass. Optical uniformity is an important parameter that reflects the quality of optical g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/45
Inventor 孙元成宋学富张晓强王慧杜秀蓉刘铸熠
Owner CHINA BUILDING MATERIALS ACAD
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