Quantitative method of measuring fringes in optical materials

Abstract

The invention relates to a quantitative method of measuring fringes in optical materials, and belongs to the technical field of optical material fringe measurement. First, a formula of fringe quantization algorithm as well as a concept of fringe quantization expression is established. Second, the optical projection testing device received by the photoelectric detector is used to demarcate or calibrate the optical projection testing device by establishing the grayscale of the received signal of the photoelectric detector and the standard calibration of the projection device. Then, the measuredsample is tested by the demarcated or calibrated optical projection test device. And then, the image of the sample is counted by the optical projection testing device, hence the quantitative expression value of the fringe defect of the tested sample is obtained by calculating through the formula of the fringe quantization algorithm. The invention changes the manual evaluation method of testing theresult of optical material fringe into the method of automatically calculating the quantitative result by using photoelectric projection test device based on the algorithm of fringe value. The invention improves greatly not only the accuracy and objectivity of the test but also the efficiency of the test work because the quantitative test result can be obtained as soon as the test image is obtained.

Description

technical field [0001] The invention relates to the technical field of optical material stripe testing, in particular to a quantitative testing method for optical material stripes. Background technique [0002] Streaks in optical materials are defects in materials caused by problems in the refining process of optical materials or control problems in the refining process, and are phenomena caused by sudden changes in the internal refractive index of optical materials. Stripe Applications of Visible Light Materials figure 1 The projection optical system can be observed (the application of schlieren optical system can also be observed). The fringes in these optical materials usually appear as filamentary or ribbon-shaped irregular strips with grayscale, such as figure 2 shown. The formation of fringes is that the refractive index there has a sudden increase (increase or decrease of Δn) relative to the refractive index of the matrix. figure 2 Examples of mild, moderate, an...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: how to design a quantitative test method for optical material stripes, to solve the problem of quantitative testing and objective evaluation of stripe defects in visible light optical materials, infrared optical materials, etc., to ensure the optical system design by selecting materials reasonably for the optical system Quality and assurance The refining quality of optical materials provides accurate quantitative testing and evaluation methods

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