Search result: JJF 1831-2020
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Calibration Specification for Spherometers
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JJF 1831-2020
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| Standard ID | JJF 1831-2020 (JJF1831-2020) | | Description (Translated English) | Calibration Specification for Spherometers | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A52 | | Classification of International Standard | 17.040 | | Word Count Estimation | 21,295 | | Date of Issue | 2020 | | Date of Implementation | 2020-04-17 | | Issuing agency(ies) | State Administration for Market Regulation |
JJF 1831-2020
(Ball caliper calibration specifications)
National Metrology Technical Specifications of the People's Republic of China
Spherometer calibration specification
2020-01-17 released
2020-04-17 implementation
Issued by the State Administration for Market Regulation
Spherometer calibration specification
forSpherometers
Replace JJG401-1985
Central unit. National Technical Committee on Geometrical Length Measurement
Drafting unit. Hubei Institute of Metrology and Testing Technology
Yunnan North Optoelectronic Instrument Co., Ltd.
Yunnan Institute of Metrology and Testing Technology
China Institute of Metrology
This specification entrusts the National Technical Committee on Geometrical Length Measurement to interpret
Drafters of this specification.
Zhou Qiang (Hubei Institute of Metrology and Testing Technology)
Li Li (Yunnan North Photoelectric Instrument Co., Ltd.)
Tao Wang (Hubei Institute of Metrology and Testing Technology)
Ming Chen (Yunnan Institute of Metrology and Testing Technology)
Li Zhixin (Yunnan North Photoelectric Instrument Co., Ltd.)
Wei Hengzheng (China Institute of Metrology)
table of Contents
Introduction (Ⅱ)
1 scope (1)
2 Reference documents (1)
3 Overview (1)
4 Measurement characteristics (1)
5 Calibration conditions (2)
5.1 Environmental conditions (2)
5.2 Measurement standards and supporting equipment (2)
6 Calibration items and calibration methods (2)
6.1 Description of calibration items (2)
6.2 Measuring ring radius (3)
6.3 Relative error of measurement of spherical curvature radius (4)
6.4 Indication error of the vector height measuring mechanism (5)
7 Expression of calibration results (5)
8 Recalibration interval (5)
Appendix A Example of Uncertainty Evaluation of the Measured Value of Ring Radius by Spherometer (6)
Appendix B Examples of Uncertainty Evaluation of the Relative Error of the Spherical Radius of Curvature (10)
Appendix C Original record content and format (14)
Appendix D Contents of Calibration Certificate and Inner Page Format (15)
introduction
This specification is based on JJF 1001-2011 "General Metrology Terms and Definitions", JJF 1071-2010 "National Metrology
Calibration Specification Compilation Rules, JJF 1059.1-2012 "Evaluation and Expression of Measurement Uncertainty", JJF 1094-2002
The "Evaluation of the Characteristics of Measuring Instruments" is based and revised.
This specification is a revision of JJG401-1985.Compared with JJG401-1985, except for editorial changes, the main
The contents to be revised are.
--- Use "relative error of spherical radius of curvature measurement" instead of "comprehensive error of spherical diameter meter", use "vector height measurement
"Measurement mechanism" replaces "reading device";
---Specifies 3 measurement characteristics. the indication error of the vector height measuring mechanism, the radius of the measuring ring, and the radius of curvature of the spherical surface
Relative error of measurement;
---The standard required for calibration has been adjusted, and the universal tool microscope, special parallel flat crystal, and vertical
Reflective lighting device;
--- Canceled the method of "Using the universal tool microscope to verify the radius of the steel ball measuring ring";
---Added appendix content.
---Change the number of measurements of the measured vector height from 5 to 3.
The release status of previous versions of this specification.
---JJG401-1985.
Spherometer calibration specification
1 Scope
This specification applies to the calibration of contact spherometers.
2 Reference documents
This specification refers to the following documents.
JJF 1071-2010 National Metrology and Calibration Specifications Compilation Rules
GB/T 308.1-2013 Rolling bearing balls Part 1.Steel balls
For dated reference documents, only the dated version applies to this specification; for undated references
The latest version (including all amendments) is applicable to this specification.
3 overview
The contact ball diameter meter (hereinafter referred to as the ball diameter meter) is a measuring instrument used to measure the radius of curvature of the spherical surface.
It is used to measure the radius of curvature of the spherical surface of the optical panel, optical sample, spherical lens, spherical mirror, etc. Spherometer
It is mainly composed of a measuring ring and a vector height measuring mechanism, which indirectly measures the curvature of the spherical surface by measuring the vector height of the spherical surface
radius.
The measuring principle of the spherometer is shown in Figure 1 and Figure 2.The chord radius r in Figure 1 and Figure 2 is also measured by the spherometer
The radius of the measuring ring in the characteristic.
Fig.1 The principle diagram of measuring the height of the vector using a steel ball type measuring ringFig.2 The principle diagram of measuring the height of the vector using a blade type measuring ring
Rc- the radius of curvature of the tested spherical surface; r- the radius of the chord; Rc- the radius of curvature of the tested spherical; r- the radius of the chord;
h- the measured value of the vector height measuring mechanism; ρ- the steel ball radius h- the measured value of the vector height measuring mechanism
4 Measurement characteristics
4.1 Measure the radius of the ring.
4.2 The relative error of the measurement of the radius of curvature of the spherical surface.
4.3 Indication error of the vector height measuring mechanism.
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