GB/T 42657-2023Test method of temperature coefficient of infrared refractive index for infrared optical glass —Normal incidence method (English PDF)

Foreword

This document complies with the regulations of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Custom drafting.

Introduction

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1 Scope

This document describes the testing principle of the infrared refractive index temperature coefficient of infrared optical glass, stipulates the testing instruments, samples, environmental requirements, measurement test procedures, data processing and test reports.

This document is suitable for testing the refractive index temperature coefficient of infrared optical glass in the 2µm ~ 13µm band, and the refraction of other infrared optical materials. Rate temperature coefficient test can be used as a reference.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 36265-2018 Infrared optical glass

3 Terms and definitions

The following terms and definitions apply to this document.

4 Test principle

The AC reflection image of the triangular prism exiting working surface is used to achieve precise positioning of the sample under test, so that the infrared parallel beam with wavelength lambda is vertically incident It reaches the AB surface of the triangular prism with the vertex angle alpha, passes through the prism and exits from the AC surface, measures the deflection angle beta, and calculates the refraction of the sample at this wavelength lambda. Rate n.

The principle of infrared refractive index testing using the vertical incidence method is shown in Figure 1.