GB/T 42222-2022Laboratory glassware—Testing method and classification of optical uniformity (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents" drafting.

1 Scope

This document describes the test method for optical uniformity of glass instruments and gives the optical uniformity classification of glass instruments.

This document is applicable to optical uniformity testing and grading of glass instrument products, and other transparent hollow glass products should be implemented as a reference.

2 Normative references

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

GB/T 6682 Analytical laboratory water specifications and test methods

GB/T 29159 Glass tubes for all-glass vacuum solar collector tubes

GB/T 35599 Terminology for Appearance Defects of Instrument Glass and Its Products

3 Terms and Definitions

GB/T 35599, GB/T 29159 and the following terms and definitions apply to this document.

4 Test Principle

When a beam of parallel polarized light is incident on a heterogeneous glass with stress and stripes, the polarized light is decomposed into vibration directions perpendicular to each other.

The two beams of light are respectively defined as the x direction and the y direction, and their propagation speeds are cx and cy respectively, because the propagation speeds of the two beams of light in the glass are different At the same time, there will be an optical path difference delta. A full-wave plate with an optical path difference of 565nm is inserted between the cross-polarized microscope light paths, and the background color of the field of view is The color is purple, and the stress and stripes in the glass present different colors of interference colors and interference fringes. According to the color of interference colors and interference fringes, the And the shape, position and thickness of interference fringes are used to grade and evaluate the glass uniformity.