Refractive index measurement method

Abstract

The invention relates to a refractive index measurement method which comprises the steps: a light emission component and an aiming component of an optical angle gauge are arranged on the incident plane side and the emergent plane side of an object to be measured respectively, the optical axis of the light emission component and the optical axis of the aiming component are arranged on the same straight line, and the included angle between the incident plane and the emergent plane is alpha; the aiming component is rotated at by the alpha degree in the included angle direction, and the object to be measured is adjusted to enable the optical axis of the aiming component to be perpendicular to the emergent plane; the incident light emitted by the light emission component irradiates to the incident plane; the aiming component is rotated to be aligned at to the emergent light, and the included angle beta between the incident light and the emergent light is obtained; the refractive index n of the object to be measured can be obtained according to the included angle alpha between the incident plane and the emergent plane and the included angle beta between the incident light and the emergent light. By means of the aiming component of the optical angle gauge, the incident light can perpendicularly irradiate into the incident plane of the object to be measured at an accurate angle; then the included angle between the incident light and the emergent light can be obtained by rotating the aiming component; thus, the accuracy of the finally-obtained refractive index of the object to be measured can be higher.

Description

technical field [0001] The invention relates to the field of precision measurement of optical materials, in particular to a method for measuring the refractive index. Background technique [0002] The refractive index parameters of optical materials are the basis of optical design. Only by accurately mastering the reliable data of the refractive index of optical materials can high-quality design work be completed according to requirements. Moreover, for optical material research and manufactures, determining the refractive index performance index of the optical material under study is an important basic content, the technical basis for material evaluation, and the reference basis for production finalization. Therefore, the refractive index of optical materials The accurate determination of is an important prerequisite for the use and development of optical materials. [0003] In the prior art, the method of measuring the refractive index of optical materials is usually to m...

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Problems solved by technology

[0003] In the prior art, the method of measuring the refractive index of optical materials is usually to measure the incident angle and exit angle when light passes through a certain surface of the optical material, and then obtain the refractive index of the optical material according to the incident angle and exit angle, However, the commonly used angle measurement method has large errors, so that the accuracy of the obtained refractive index is low, and the conventional method can only be measured for optical materials that can transmit visible light

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