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GB/T 15972.20-2021 English PDF

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GB/T 15972.20-2021: Specifications for optical fibre test methods - Part 20: Measurement methods and test procedures for dimensions - Fibre geometry
Status: Valid

GB/T 15972.20: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB/T 15972.20-2021	English	649	Add to Cart	6 days [Need to translate]	Specifications for optical fibre test methods - Part 20: Measurement methods and test procedures for dimensions - Fibre geometry	Valid	GB/T 15972.20-2021
GB/T 15972.20-2008	English	759	Add to Cart	4 days [Need to translate]	Specifications for optical fibre test methods -- Part 20: Measurement methods and test procedures for dimensions -- Fiber geometry	Obsolete	GB/T 15972.20-2008

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Basic data

Standard ID	GB/T 15972.20-2021 (GB/T15972.20-2021)
Description (Translated English)	Specifications for optical fibre test methods - Part 20: Measurement methods and test procedures for dimensions - Fibre geometry
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	M33
Word Count Estimation	35,330
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration

GB/T 15972.20-2021: Specifications for optical fibre test methods - Part 20: Measurement methods and test procedures for dimensions - Fibre geometry

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Specifications for optical fibre test methods-Part 20.Measurement methods and test procedures for dimensions-Fibre geometry ICS 33.180.10 M33 National Standards of People's Republic of China Replace GB/T 15972.20-2008 Optical fiber test method specification Part 20.Dimensional parameters Measurement methods and test procedures Optical fiber geometric parameters Fibregeometry (IEC 60793-1-20.2014, Opticalfibres-Part 1-20.Measurementmethods Released on 2021-04-30 and implemented on 2021-11-01 State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee

Foreword Ⅰ 1 Scope 1 2 Normative references 1 3 Terms and definitions, symbols 1 4 Overview of measurement methods 3 5 Benchmark test method (RTM) 5 6 Device 5 7 Sample 6 8 Procedure 6 9 Calculation 6 10 Results 6 Appendix A (Normative Appendix) Method A---Specific requirements for the refractive near-field method 7 Appendix B (Normative Appendix) Method B---Specific requirements for the transmission near-field method 12 Appendix C (Normative Appendix) Edge Detection and Edge Table Structure 18 Appendix D (Normative Appendix) Ellipse Fitting and Filtering of Edge Table 22 Appendix E (informative appendix) Fitting the near-field data of the A1 fiber core using a power law model 24 Appendix F (informative appendix) Mapping test of A fiber core diameter 30 References 31

Foreword

GB/T 15972 "Specifications for Optical Fiber Test Methods" consists of several parts, and its expected structure and corresponding international standards are. ---Part 10.General principles of measurement methods and test procedures (corresponding to IEC 60793-1-1); ---Part 20~Part 29.Measurement methods and test procedures of dimensional parameters (corresponding to IEC 60793-1-20 to IEC 60793- 1-29); ---Part 30~Part 39.Measurement methods and test procedures of mechanical properties (corresponding to IEC 60793-1-30 to IEC 60793- 1-39); ---Part 40~Part 49.Measurement methods and test procedures of transmission characteristics (corresponding to IEC 60793-1-40 to IEC 60793- 1-49); ---Part 50~Part 59.Environmental performance measurement methods and test procedures (corresponding to IEC 60793-1-50 to IEC 60793- 1-59). Among them, GB/T 15972.2× consists of the following parts. ---Part 20.Measurement methods of dimensional parameters and test procedures for optical fiber geometric parameters; ---Part 21.Measurement methods of dimensional parameters and test procedures for coating geometric parameters; --- Part 22.The measurement method of dimensional parameters and the length of the test procedure. This part is Part 20 of GB/T 15972. This section was drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 15972.20-2008 "Specification for optical fiber test methods Part 20.Measurement methods and tests of dimensional parameters The main technical changes compared with GB/T 15972.20-2008 are as follows. ---Modified terms and definitions (see Chapter 3, Chapter 3 of the.2008 edition); --- Added symbols (see Chapter 3, Chapter 3 of the.2008 edition); ---Modified method A refraction near-field method and method B transmission near-field method (see Chapter 4, Appendix A and Appendix B,.2008 edition Chapter 4, Appendix A and Appendix C); ---Deleted the lateral interference method and the mechanical diameter method (see Chapter 4, Appendix B and Appendix D of the.2008 edition); ---Modified the benchmark test method, stipulated that the video gray scale method in method B is the benchmark test method (RTM) (see Chapter 5,.2008 Chapter 4 of the edition); ---Added graphical fitting procedures and calculation methods (see Appendix C, Appendix D and Appendix E); ---Added the mapping test of the core diameter of the Type A optical fiber (see Appendix F). This part uses the redrafting method to modify and adopt IEC 60793-1-20.2014 "Optical Fiber Part 1-20.Measurement Methods and Test Procedures" Order Optical Fiber Geometric Parameters". This part has structural changes compared with IEC 60793-1-20.2014, and the content of Chapter 11 is merged into Chapter 10. The technical differences between this part and IEC 60793-1-20.2014 and the reasons are as follows. ---Regarding normative reference documents, this section has made adjustments with technical differences to adapt to my country's technical conditions and adjustments. The situation is collectively reflected in Chapter 2 "Normative Reference Documents", and the specific adjustments are as follows. ● Added reference to GB/T 15972.10; ● Removed IEC 60793-2-10, IEC 60793-2-20, IEC 60793-2-30, IEC 60793-2-40, IEC 60793-2-50 And IEC 60793-2-60. This section has made the following editorial changes. --- Modify the standard name to "Specification for Optical Fiber Test Methods Part 20.Measurement Methods and Test Procedures for Dimensional Parameters Optical Fiber Geometric parameters". Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents. This part was proposed by the Ministry of Industry and Information Technology of the People's Republic of China. This part is under the jurisdiction of the National Communication Standardization Technical Committee (SAC/TC485). Drafting unit of this section. Fiberhome Technology Group Co., Ltd. The main drafters of this section. Liu Cheng, Hu Guyue, Wang Dongxiang, Wei Zhongcheng, Hu Peng, Shen Jiaming. The previous releases of the standards replaced by this part are as follows. ---GB/T 15972.20-2008. Optical fiber test method specification Part 20.Dimensional parameters Measurement methods and test procedures Optical fiber geometric parameters

1 Scope

This part of GB/T 15972 specifies the test methods for measuring geometric parameters of uncoated optical fibers, including terms, definitions and symbols, and establishes The general test procedures and technical requirements of measurement methods, benchmark test methods, devices, samples, procedures, calculations and results are described. This section applies to class A multimode optical fiber, class B single mode optical fiber and class C single mode optical fiber.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document. GB/T 15972.10 Optical fiber test method specification Part 10.General rules of measurement methods and test procedures (GB/T 15972.10- 2021, IEC 60793-1-1.2017, MOD) IEC 61745 Optical fiber geometric parameter measurement device calibration end-face image analysis program (End-faceimageanalysis procedureforthecalibrationofopticalfibregeometrytestsets) 3 Terms and definitions, symbols 3.1 Terms and definitions The following terms and definitions apply to this document. 3.1.1 Referencepoint Fixed coordinates in the scan plane. Note. The selection of the reference point is arbitrary, such as the lower left corner of the video image or the rough center point of the optical fiber in the scanning device. 3.1.2 Center The center of the cladding or core in the measurement plane relative to the reference point. 3.1.3 Diameter The average value of the length of the line segment that connects two points on the circumference of the approximately circular cladding or core and passes through the center. Note. The diameter is expressed in microns (μm). 3.1.4 Non-circularity The difference between the maximum and minimum distance between the cladding (or core) boundary and the center of the cladding (or core) and the radius of the cladding (or core) ratio. Note. Out-of-roundness is indicated by a percent sign.

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