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JJF 1912-2021: (Calibration specification for sunglasses power detection device)
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JJF 1912-2021: (Calibration specification for sunglasses power detection device)

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(Calibration specification for sunglasses power detection device) National Metrology Technical Specification of the People's Republic of China Sunglasses power detection device calibration specification Published on 2021-07-28 2022-01-28 Implementation Released by the State Administration for Market Regulation Sunglasses power detection device Calibration specification Focal Point. National Medical Metrology Technical Committee Main drafting unit. China Institute of Metrology Participating in the drafting unit. Zhejiang Institute of Metrology Shenzhen Institute of Metrology and Quality Inspection Hubei Institute of Metrology and Testing Technology This specification entrusts the National Medical Metrology Technical Committee to be responsible for the interpretation The main drafters of this specification. Li Fei (China Institute of Metrology) Gao Mingliang (China Institute of Metrology) Participating drafters. Wang Wenxing (Zhejiang Institute of Metrology) Li Xiangzhao (Shenzhen Institute of Metrology and Quality Inspection) Xu Xun (Hubei Institute of Metrology and Testing Technology)

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Introduction (Ⅱ) 1 Scope(1) 2 References (1) 3 Terms and units of measurement(1) 3.1 Back Top Focal Length(1) 3.2 Back Vertex(1) 3.3 Optical power(1) 3.4 Prism degree(1) 3.5 Reference plane(2) 4 Overview(2) 5 Metrology Characteristics(3) 5.1 Zero position indication error(3) 5.2 Indication error of spherical lens vertex power (3) 5.3 Repeatability of spherical lens vertex power measurement(3) 5.4 Prism degree indication error (3) 6 Calibration Conditions(3) 6.1 Environmental conditions (3) 6.2 Measurement standards and other equipment(3) 7 Calibration items and calibration methods (4) 7.1 Appearance and functional inspection (4) 7.2 Zero position indication error(4) 7.3 Indication error of spherical lens vertex power (4) 7.4 Repeatability of spherical lens vertex power measurement(4) 7.5 Prism degree indication error(4) 8 Expression of calibration results (4) 9 Recalibration interval(5) Appendix A Calibration Raw Record Reference Format(6) Appendix B Calibration Certificate Inside Page Reference Format(7) Appendix C Example of Measurement Uncertainty of Indication Error of Back Vertex (8) Appendix D Prism Indication Error Measurement Uncertainty Evaluation Example (10)

Introduction

JJF 1001 "General Metrology Terms and Definitions", JJF 1032 "Optical Radiation Metrology Terms and Definitions", JJF 1059.1 "Assessment and Representation of Measurement Uncertainty" and JJF 1071 "Rules for Compilation of National Metrology Calibration Specifications" It constitutes the basic series of specifications that support the formulation of this specification. This specification is published for the first time. Sunglasses power detection device calibration specification

1 Scope

This specification applies to the calibration of the vertex power and prism power of the sunglass power detection device.

2 Reference documents

This specification references the following documents. JJG580-2005 Focus meter GB/T 13962-2009 Optical Instrument Terminology QB2457-1999 Sunglasses ISO 12311.2013 Test Methods for Personal Protective Equipment Sunglasses and Related Goggles (Personal For dated references, only the dated version applies to this specification; for undated references The latest version (including all amendments) applies to this specification.

3 Terminology and units of measurement

The distance from the back vertex of the lens to the back focus, also known as the image square vertex focal length, as shown in Figure 1, represented by the symbol lf'. Figure 1 Schematic representation of the back vertex of the lens H-object principal point; H'-image principal point; F-object focus; F'-image focus; f-object focal length; f'-image focal length 3.2 Back vertex power backvertexpower The inverse of the paraxial back focal length of the lens, measured in meters, i.e. 1/lf'. The unit is m-1.in ophthalmic optics Field, the unit of back vertex power is also called diopter, and is represented by D. 3.3 focal power The ability of an optical system (or lens) to converge or diverge light. Its value is the reciprocal of the focal length and the refractive index of the medium accumulation. 3.4 Prismatic power A measure of the deviation of light rays from passing through a specified point on the lens (usually the center of the lens). The unit is centimeters per ...