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GB/T 7962.7-2025 English PDF

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GB/T 7962.7-2025: Test methods of colourless optical glass - Part 7: Extent of striae
Status: Valid

GB/T 7962.7: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB/T 7962.7-2025	English	289	Add to Cart	3 days [Need to translate]	Test methods of colourless optical glass - Part 7: Extent of striae	Valid	GB/T 7962.7-2025
GB/T 7962.7-1987	English	139	Add to Cart	2 days [Need to translate]	Colourless optical glass test methods. Examination method for extent of stria		GB/T 7962.7-1987

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Basic data

Standard ID	GB/T 7962.7-2025 (GB/T7962.7-2025)
Description (Translated English)	Test methods of colourless optical glass - Part 7: Extent of striae
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	L50
Classification of International Standard	81.040.01
Word Count Estimation	14,112
Date of Issue	2025-06-30
Date of Implementation	2026-01-01
Older Standard (superseded by this standard)	GB/T 7962.7-1987
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration

GB/T 7962.7-2025: Test methods of colourless optical glass - Part 7: Extent of striae

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT7962.7-2025
ICS 81.040.01 CCSL50 National Standard of the People's Republic of China Replaces GB/T 7962.7-1987 Test methods for colorless optical glass Part 7.Streakiness Released on June 30, 2025 Implementation on January 1, 2026 State Administration for Market Regulation The National Standardization Administration issued

Preface III Introduction V 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Test Principle 1 5 Instruments 1 6 Sample 3 7 Test Conditions 3 8 Test Step 3 8.1 Preparation 3 8.2 Test Operation 4 9 results indicate 4 10 Test Report 4 Appendix A (Informative) Optical Component Fringe Measurement Method Interferometry 6 Preface 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 is required. This document is part 7 of GB/T 7962 Test methods for colorless optical glass. GB/T 7962 has been published in the following parts. --- Part 1.Refractive index and dispersion coefficient; --- Part 2.Fizeau plane interferometry for optical uniformity; --- Part 3.Optical uniformity holographic interferometry; --- Part 4.Temperature coefficient of refractive index; --- Part 5.Stress birefringence; --- Part 6.Young's modulus, shear modulus and Poisson's ratio; --- Part 7.Streakiness; --- Part 8.Bubble degree; --- Part 9.Light absorption coefficient; --- Part 10.X-ray resistance; --- Part 11.Precision test of visible refractive index; --- Part 12.Spectral transmittance; --- Part 13.Thermal conductivity; --- Part 14.Acid stability; --- Part 15.Moisture resistance stability; --- Part 16.Linear expansion coefficient, transition temperature and relaxation temperature; --- Part 17.Ultraviolet and infrared refractive index; --- Part 18.Kirschner hardness; --- Part 19.Abrasion; --- Part 20.Density; --- Part 21.Alkali resistance stability; --- Part 22.Stability to phosphoric acid; --- Part 23.Weathering stability. This document replaces GB/T 7962.7-1987 "Test methods for colorless optical glass, test method for streaking", and GB/T 7962.7- Compared with 1987, in addition to structural adjustments and editorial changes, the main technical changes are as follows. --- Increased the scope of application (see Chapter 1); --- Added terms and definitions (see Chapter 3); --- Changed the streak meter (see Chapter 5, Chapter 2 of the 1987 edition); --- Changed the sample requirements (see Chapter 6, Chapter 3 of the 1987 edition); --- Changed the test steps (see Chapter 8, Chapter 4 of the 1987 edition); --- Changed the test report (see Chapter 10, Chapter 5 of the 1987 edition). Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the China Machinery Industry Federation. This document is under the jurisdiction of the National Technical Committee for Standardization of Optics and Photonics (SAC/TC103). This document was drafted by. Chengdu Guangming Optoelectronics Co., Ltd., Chengdu Guangming Optoelectronics Co., Ltd., Hubei Xinhuaguang Information Materials Co., Ltd., Ningbo Sunny Infrared Technology Co., Ltd., China Ordnance Industry Standardization Institute, Hubei Feilihua Quartz Glass Co., Ltd. Jinan Guangwei Semiconductor Technology Co., Ltd., Shanghai Feilihua Shichuang Technology Co., Ltd., Jilin Jianzhu University, Dongguan Yutong Optical Technology Co., Ltd., Qingdao Fusion Optoelectronics Technology Co., Ltd. The main drafters of this document are. Zhang Zuyi, Liu Zhenyu, Xue Lisha, Kuang Bo, Luo Lianghong, Zhang Qing, Yang Miling, Zhou Gang, Shen Xiaoyan, Ren Heqi, Zhang Han, Xia Guojun, Huang Yun, Hua Jun, Li Yongtao, Meng Yinxia, He Jianwei, and Zhang Yunxiao. The previous versions of this document and the documents it replaces are as follows. ---First published in 1987 as GB/T 7962.7-1987; ---This is the first revision.

introduction

Colorless optical glass is one of the basic optical materials widely used in optoelectronic information industry. The "Test Method" can guide the industry to more effectively solve the problems of product quality evaluation and physical and chemical performance testing of colorless optical glass. The various parts of GB/T 7962 specify the optical properties, internal quality, thermal properties, chemical properties, mechanical properties of colorless optical glass. GB/T 7962 is intended to consist of 27 parts. --- Part 1.Refractive index and dispersion coefficient. The purpose is to specify the technical requirements for the V prism method to test the refractive index and dispersion coefficient. --- Part 2.Fizeau plane interferometry for optical uniformity. The purpose is to specify the Fizeau plane interferometry method for testing optical uniformity. Technical requirements. --- Part 3.Holographic interferometry for optical uniformity. The purpose is to specify the technique for testing optical uniformity using holographic interferometry. Require. --- Part 4.Temperature coefficient of refractive index. The purpose is to specify the technical requirements for testing the temperature coefficient of refractive index using the minimum deviation angle method. --- Part 5.Stress birefringence. The purpose is to specify the technical requirements for testing stress birefringence. --- Part 6.Young's modulus, shear modulus and Poisson's ratio. The purpose is to specify the ultrasonic pulse echo method to test the elastic constants of materials technical requirements. --- Part 7.Striae. The purpose is to specify the technical requirements for the projection method to test striae. --- Part 8.Bubble degree. The purpose is to specify the technical requirements for testing bubble degree. --- Part 9.Light absorption coefficient. The purpose is to specify the technical requirements for testing the white light absorption coefficient, and plans to add monochromatic light absorption Technical requirements for coefficient testing. --- Part 10.X-ray resistance. The purpose is to specify the technical requirements for testing the X-ray resistance of radiation-resistant optical glass. --- Part 11.Precision test of visible refractive index. The purpose is to specify the technical requirements for precision test of refractive index in the visible light region. --- Part 12.Spectral transmittance. The purpose is to specify the technical requirements for testing spectral transmittance. It is planned to increase spectral transmittance Comparison test technical requirements. --- Part 13.Thermal conductivity. The purpose is to specify the technical requirements for testing thermal conductivity using the flash method and guarded hot plate method. --- Part 14.Acid resistance stability. The purpose is to specify the technical requirements for surface method testing of acid resistance stability. --- Part 15.Moisture Stability. The purpose is to specify the technical requirements for the turbidity method to test moisture stability. --- Part 16.Linear expansion coefficient, transition temperature and relaxation temperature. The purpose is to specify the use of push rod method to test the thermal properties of materials technical requirements. --- Part 17.Ultraviolet and infrared refractive index. The purpose is to specify the autocollimation method and the minimum deviation angle method for testing ultraviolet and infrared refractive index technical requirements. --- Part 18.Kirkmarsh hardness. The purpose is to specify the technical requirements for testing Kirkmarsh hardness. --- Part 19.Abrasion. The purpose is to specify the technical requirements for testing abrasion. --- Part 20.Density. The purpose is to specify the technical requirements for density testing by buoyancy method. --- Part 21.Alkali stability. The purpose is to specify the technical requirements and classification rules for alkali stability testing using the weight loss method. --- Part 22.Phosphoric acid stability. The purpose is to specify the technical requirements and classification judgment of the weight loss method for testing phosphoric acid stability. rule. --- Part 23.Weathering stability. The purpose is to specify the technical requirements and classification judgment of turbidity method for testing weathering stability rule. --- Part 24.Stress-optical coefficient. The purpose is to specify the technical requirements for testing stress-optical coefficient. --- Part 25.Fluorescence characteristics. The purpose is to specify the technical requirements for testing fluorescence characteristics. --- Part 26.Stress uniformity. The purpose is to specify the technical requirements for testing the stress uniformity of high-precision optical glass. --- Part 27.Solar stability. The purpose is to specify the technical requirements for solar stability. Test methods for colorless optical glass Part 7.Streakiness 1 Scope This document describes the test principles, instruments, samples, test conditions, test steps, result expression and test of colorless optical glass streak Report. This document is applicable to the testing of the streak degree of colorless optical glass, and can be used as a reference for the testing of the streak degree of other materials that transmit light within the test band. 2 Normative references The contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 903-2019 Colorless optical glass 3 Terms and Definitions The following terms and definitions apply to this document. 3.1 stripes Material inhomogeneity caused by differences in the refractive index of a local area within the glass relative to the surrounding area. 3.2 extent of striae The degree of striations contained within the glass being tested. Note. This includes the thickness, length and density of the stripes. 4 Test Principle When there are stripes in the glass, there is a difference in refractive index between the stripes and the glass matrix. The presence of stripes will cause the light to be deflected, and a stripe image will appear on the beam cross section. The stripe image is projected onto the projection screen through optical imaging and observed by human eyes or received by image sensor. Under dark background, the stripe image is detected. The shape, size and distribution of the stripes determine the stripe degree level. When the light-through surface of the glass sample to be inspected is a polished parallel plane, conventional inspection is adopted; when the light-through surface of the glass sample to be inspected is a finely ground parallel plane, When the glass sample is flat, the light-transmitting surface is matched with the refractive liquid by the mounting plate, and the mounting plate method is used for detection; when the light-transmitting surface of the glass sample is spherical or aspherical When testing on non-parallel surfaces such as surfaces, pressed preforms, etc., the sample is immersed in the matching refractive liquid in the sample pool and the immersion method is used for testing. 5 Instruments The basic structure of the projection stripe meter is shown in Figure 1.According to the different ways of obtaining stripe images by the image receiving system, there are two types. projection screen receiving system and projection screen receiving system.

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