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JJG 28-2019 English PDFStandard Briefing:Stadard ID: JJG 28-2019Stadard Title: Optical Flats Price (USD): 789 Lead day (Deliver True-PDF English version): 7 days Status: Valid Evolution and Historical Versions:
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Contents, Scope, and Excerpt:JJG 28-2019 Optical Flats National Measurement Verification Regulations of the People's Republic of China Flat crystal 2019-09-27 release 2020-03-27 Implementation Issued by the State Administration of Market Supervision and Administration Flat Crystal Verification Regulations Replace JJG 28-2000 Centralized unit. National Technical Committee for Geometric Engineering Parameter Measurement Main drafting unit. Hunan Institute of Metrology and Testing Chinese Academy of Metrology Participated in the drafting unit. Suzhou Huili Instrument Co., Ltd. 205th Research Institute of China Ordnance Industry This regulation entrusts the National Geometric Engineering Parameter Measurement Technical Committee to explain The main drafters of this regulation. Chen Yong (Hunan Provincial Institute of Metrology and Testing) Zhang Heng (Chinese Academy of Metrology) Zeng Yan (Hunan Provincial Institute of Metrology and Testing) Liu Lijuan (Hunan Provincial Institute of Metrology and Testing) Participating drafters. Han Sen (Suzhou Huili Instrument Co., Ltd.) Bai Wenqi (Hunan Institute of Metrology and Testing) Shengyun Wang (205th Research Institute of China Ordnance Industry) table of Contents Introduction (Ⅱ) 1 Scope (1) 2 References (1) 3 Overview (1) 4 Measurement performance requirements (3) 4.1 Parallelism (3) 4.2 Flatness of working surface (3) 4.3 Flatness of non-working surface (4) 4.4 Stability (4) 5 General technical requirements (5) 5.1 Appearance and surface quality (5) 5.2 Dimensions (5) 5.3 The position of the cross-line of the flat crystal (6) 5.4 Angle between two ends (6) 5.5 The perpendicularity of the working surface and the cylindrical generatrix (7) 6 Control of measuring instruments (7) 6.1 Verification items and main verification equipment (7) 6.2 Verification conditions (7) 6.3 Verification method (9) 6.4 Processing of verification results (12) 6.5 Verification period (12) Appendix A Dimensions and Quantity of Flat Surface Defects (13) Appendix B. Phase-shift laser equal-thickness interferometry (15) Appendix C. Equal thickness interferometry (18) Appendix D Isoclinic Interferometry (20) Appendix E Data Processing Examples of Veritable Flat Crystals Tested by the Four-sided Mutual Inspection Method (22) Appendix F. Deformation of Changping crystal by its own weight (25) Appendix G Format of the inner pages of the verification certificate and verification result notification (27) introduction JJF1001-2011 "General Metrology Terms and Definitions", JJF1002-2010 "National Metrology Verification Regulations "Rules", JJF1059.1-2012 "Measurement Uncertainty Evaluation and Representation" together form the basis for the revision of this code Basic series of technical regulations. Compared with JJG 28-2000 "Flat Crystal", the main technical changes are as follows. --- Corrected the printing error of JJG 28-2000 "Flat Crystal". JJG 28-20006.3.8.2b) Chinese formula (6). u2 = 12u1 And the correction is. ub = 12ua [See current edition Formula (5)]; JJG 28-2000 Appendix C, Table C.1, Table 8 Header Column 8.Ei = (Li/Ln) Kn, corrected as. Ei = (Li/Ln) ΔKn (see current table E.1); JJG 28-2000 Appendix D Chinese formula (D.2). ΔF = d ÷ × F96, corrected as. ΔF = × F96 [See current layout (C.2)]. --- The difference of flatness of the 310mm long flat crystal in two cycles of verification is relaxed from 0.020μm to 0.030μm (see 4.4). --- According to JJG 146-2011 "Measuring Block", 6 equivalent blocks were cancelled and 5 equivalent blocks were replaced (see 6.3.2). --- Cancelled the method of parallel parallel crystal parallelism verification on laser plane equal thickness interferometer. --- Increase the structure overview, measurement method (see Appendix B) and other related contents of the phase shift type equal thickness measuring device. --- Add the calculation method of flatness within the range of standard flat crystal F96 (see Appendix C) The release of previous versions of this regulation. --- JJG 28-2000; --- JJG 28-1991; --- JJG 28-1980. Flat Crystal Verification RegulationsScopeThis regulation is applicable to the first verification, subsequent verification and flat verification of flat crystals (including flat flat crystals, parallel flat crystals and long flat crystals) Check in use. 2 Reference documents This regulation refers to the following documents. GB/T 903-2019 colorless optical glass JB/T 7401-1994 Flat flat crystal JB/T 7402-1994 parallel flat crystal ISO 14999-4..2015 (E) Interferometer measurement of optical and photonic optics and optical systems Section 4 Part. Tolerance description and evaluation clearly specified in ISO 10110 (Optics and photonics-Interfero- metricmeasurementofopticalelementsandopticalsystems-Part 4.Interpretationand evaluationoftolerancesspecifiedinISO 10110) For dated references, only the dated versions are applicable to this Regulation; for those without dates The latest version (including all amendments) is applicable to this regulation. 3 Overview Pingjing is a measuring instrument that measures flatness, straightness, fit and parallelism using the light wave interference method, including flatness Face flat crystal, parallel flat crystal and long flat crystal. Planar flat crystals can be divided into single working plane flat crystals and double working plane flats according to the number of working faces The shape of the crystal is shown in Figure 1; according to the purpose, it can be divided into two categories. standard flat crystal and working flat crystal. First and second grades, working flat crystals are divided into first and second grades. ...... |