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JJF 1814-2020: Calibration Specification for Haze Tablets
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JJF 1814-2020: Calibration Specification for Haze Tablets

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(Haze film calibration specifications) National Metrology Technical Specifications of the People's Republic of China Haze sheet calibration specification 2020-01-17 released 2020-04-17 implementation Issued by the State Administration for Market Regulation Haze sheet calibration specification Focal point. National Optical Metrology Technical Committee Main drafting unit. China Institute of Metrology Participated in the drafting. Shandong Institute of Metrology Beijing Institute of Metrology and Testing This specification entrusts the National Optical Metrology Technical Committee to be responsible for the interpretation The main drafters of this specification. Wu Houping (China Institute of Metrology) Participating drafters. Wang Yu (China Institute of Metrology) Kong Wei (Shandong Institute of Metrology) Zhang Qingxian (Beijing Institute of Metrology and Testing Science)

table of Contents

Introduction (Ⅱ) 1 scope (1) 2 Reference documents (1) 3 Term (1) 3.1 Haze (1) 3.2 Haze meter (1) 4 Overview (1) 5 Measurement characteristics (2) 5.1 Haze value (2) 5.2 Haze uniformity (2) 5.3 Transmittance (2) 5.4 Uniformity of transmittance (2) 6 Calibration conditions (2) 6.1 Environmental conditions (2) 6.2 Measurement standards and other equipment (2) 7 Calibration items and calibration methods (3) 7.1 Appearance (3) 7.2 Haze sheet value calibration (3) 8 Presentation of calibration results (5) 9 Recalibration interval (5) Appendix A Recommended Format of Original Record of Haze Sheet Calibration (6) Appendix B Recommended format of the inner page of the calibration certificate (7) Appendix C Example of Uncertainty Evaluation for Haze Measurement Results of Calibration Haze Sheet (8)

Introduction

JJF 1032 "Terms and Definitions of Optical Radiation Metrology", JJF 1071 "National Metrology and Calibration Specifications Compilation Rules Rules" and JJF 1059.1 "Measurement Uncertainty Evaluation and Representation" together constitute a basic series supporting the formulation of this specification specification. This specification is released for the first time. Haze sheet calibration specification

1 Scope

This specification applies to the calibration of standard haze sheets and working haze sheets, as well as the use of haze meters for plate, sheet, thin Calibration of haze and visible light transmittance of transparent materials such as film.

2 Reference documents

This specification refers to the following documents. JJF 1032 Terms and Definitions of Optical Radiation Metrology JJF 1303 Haze Meter Calibration Specification GB/T 2410 Determination of light transmittance and haze of transparent plastics ASTMD1003 Standard Test Method for Haze and Transmittance of Transparent Plastics (StandardTestMethod forHazeandLuminousTransmittanceofTransparentPlastics) 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 Term

3.1 Haze The ratio of the diffuse transmittance τd of the sample to its total transmittance τt, multiplied by 100, the symbol is Hd, and the unit Is 1. Hd= τd τt× 100 (1) 3.2 Hazemeter An instrument for measuring haze. Integrating sphere method with specific geometric conditions is used for measurement. The instrument is mainly composed of integrating sphere, light Source, collimation system, sample chamber, light trap, standard reflector, photometric detector and signal processing.

4 overview

Haze is an important parameter describing the physical properties of transparent materials, and it characterizes the scattering and transmission characteristics of materials. fog Degree measurement has been widely used in plastic films, liquid crystal display materials, chemical raw materials, automotive safety glass, architectural glass Product testing and quality control in the fields of glass, face protection lenses, aerospace, etc. The haze sheet is passed as the haze measurement value The carrier and the measuring instrument calibrated by the haze meter can store the haze measurement value reliably, stably and conveniently. The calibration and uniformity of the haze measurement value play an important role. The haze of the haze sheet or transparent material is usually calibrated and measured with a haze calibration device or a haze meter. Haze film or The effective size of the haze measurement sample is larger than the opening size of the integrating sphere of the haze measurement device. For passing and saving fog metrics The recommended haze sheet dimensions are 50mm×50mm square or ϕ60mm round, and the effective haze test at the center The area is not less than ϕ30mm to meet the measurement requirements of the haze meter. ...