Method for evaluating and controlling temperature influence on a homogeneity test for infrared optical materials

Abstract

The present application relates to the measurement technology of the homogeneity in optical materials, and more particularly to a method for evaluating and controlling temperature influence on a homogeneity test for infrared optical materials. The precision of the test results is found to be affected by local small temperature changes of the sample during the homogeneity test for the refractive indexes of infrared optical materials, the invention establishes a two-dimensional numerical table in which the test precision requirements of a refractive index homogeneity test for infrared optical materials correspond to the ambient control temperatures in the test room corresponding to the influence of temperature changes on the refractive index of different infrared optical materials. In addition, related calculation formulas are established for theory analysis, numerical calculation and form-designing. The method of the present invention accurately guides the temperature control for the precision of the homogeneity test for infrared optical materials.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of International Application No. PCT / CN2019 / 109387 with a filling date of Sep. 30, 2019, designating the United States, now pending, and further claims the benefit of priority from Chinese Patent Application No. 201811219048.6, with a filing date of Oct. 19, 2018. The content of the aforementioned application, including any intervening amendments thereto, is incorporated herein by reference in its entirety.TECHNICAL FIELD[0002]The present application relates to homogeneity tests for infrared optical materials, and more particularly to a method for evaluating and controlling temperature influence on a homogeneity test for infrared optical materials.BACKGROUND OF THE INVENTION[0003]The homogeneity test for infrared optical materials is a high-precision test to detect the homogeneity of the refractive index of infrared optical materials, in which the test precision is usually required to be as high as 1×10−...

AI Technical Summary

Benefits of technology

[0015]In an embodiment, k is ½, ⅓, ¼, or ⅕; the smaller a value of k, the smaller influence of temperature changes on precision of the homogeneity test; and a minimum precision of the homogeneity test is obtained when k is set as ½.

[0022]The precision of the test result is found to be affected by a small local temperature change of the sample during the homogeneity test for the refractive index of infrared optical materials, and therefore the invention establishes a two-dimensional numerical table in which the test precision requirements of the refractive index test of the infrared optical materials correspond to the ambient control temperature corresponding to the influence of temperature changes on the refractive index of different infrared optical materials. In addition, related calculation formulas are established for theory analysis, numerical calculation and table-designing. The present invention provides a method for evaluating and controlling temperature influence on a homogeneity test for the infrared optical materials, which can accurately guide the temperature control to ensure the precision of the homogeneity test for the infrared optical materials.

Problems solved by technology

Generally, efforts are made on the precision of the test equipment and the test methods to ensure a high precision of the homogeneity test of the refractive index, and however high-precision tests cannot be realized only by the high-precision equipment and the high-precision method.

Up to 4×10−4˜1×10−5 is caused for the refractive index of different infrared materials due to the temperature change of infrared optical materials per centigrade, and test rooms have a temperature tolerance of 22° C.±2° C. or 22° C.±1° C. Therefore, if the influence of the ambient temperature change in the test room on the refractive index of the sample is not evaluated and controlled, the test results will seriously deviate from the actual situation, causing invalid test results.

As a result, if materials are required to have a high test precision, and refractive index thereof is sensitive to temperature changes thereof, the test results of such materials are seriously distorted, and the results of the homogeneity test for infrared optical materials lose credibility and availability thereof.

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