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GB/T 44926-2024Nanotechnologies—Characterization of micro surface and sub surface—Optical dark-field confocal microscopy (English PDF)

纳米技术 微区表面及亚表面表征 光学暗场共焦显微法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

December 31, 2024

Implementation date

July 1, 2025

Scope

GB/T 44926-2024 is the English-translated version of 纳米技术 微区表面及亚表面表征 光学暗场共焦显微法.

GB/T 44926-2024 is the Chinese national standard covering measuring the surface of a solid and the transparent layer just beneath it with a dark-field confocal microscope — the principle and the dark-field scattering module, the equipment configuration and the measurement conditions, the measurement steps and the data processing, the tilt correction and the correction coefficient a subsurface reading needs because the light has travelled through material, the characterization of results, and the test report. First edition, under the Chinese Academy of Sciences. In force from 1 July 2025. Issued on 31 December 2024, it has been in force since 1 July 2025.

Document preview — GB/T 44926-2024

National Standard of the People's Republic of China

ICS
17.040.30
Classification
N 51

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Contents

  • PrefaceIII
  • IntroductionIV
  • 1 Scope1
  • 2 Normative references1
  • 3 Terms and Definitions1
  • 4 Principle2
  • 5 Equipment configuration and measurement conditions4
  • 6 Measurement Step4
  • 7 Data Processing5
  • 8 Results Characterization6
  • 9 Factors Affecting Characterization Results6
  • 10 Test Report7
  • Appendix A (Normative) Dark Field Scattering Confocal Module8
  • Appendix B (Informative) Tilt correction method for optical dark field confocal microscope measurement results9
  • Appendix C (Informative) Calculation method of correction coefficients for subsurface measurements of optical dark field confocal microscope11
  • Appendix D (Informative) Example of Neodymium Glass Optical Dark Field Confocal Microscopy Measurement Results13
  • Appendix E (Informative) Example of Subsurface Step Height Measurement Results15
  • References16

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.

This document was proposed by the Chinese Academy of Sciences.

This document is under the jurisdiction of the National Nanotechnology Standardization Technical Committee (SAC/TC279).

This standard was drafted by: Harbin Institute of Technology, China Institute of Metrology, Kunming Institute of Physics, Xi'an Institute of Applied Optics, Beijing Institute of Microelectronics Technology, China Aerospace Science and Industry Corporation Defense Technology Research and Experimental Center.

The main drafters of this standard.

Introduction

The surface and subsurface quality control of micro-nano devices and high-end optical components is an important factor affecting product performance and service life.

Effective characterization of micron and nanometer-scale characteristic structures on the surface and subsurface of the region is an important step in improving the exploration of micro-nano processing and ultra-precision processing mechanisms and processes.

It is an important guarantee for the quality control capability of finalization and mass production, and is widely used in the fields of ultra-smooth optical components, micro-optical devices, semiconductor materials, etc. need.

Optical dark-field confocal microscopy can realize three-dimensional efficient detection of weak dark-field scattering signals on the surface and subsurface of sample micro-areas.

The formulation of this document provides a unified standard for characterizing the surface and subsurface structure of optically transparent solid materials using optical dark-field confocal microscopy.

This method is conducive to improving the detection level of high-performance devices and providing quality control and new process development for the processing and production of precision optical components and micro-nano devices. Provide testing guarantee.

Nanotechnology Micro-area Surface and Sub-surface Characterization Optical dark-field confocal microscopy

1 Scope

This document describes a method for characterizing micro-areas surfaces and sub-surfaces using optical dark-field confocal microscopy.

This document applies to solid materials.

2 Normative references

GB/T 34879-2017

3 Terms and definitions

The terms and definitions defined in GB/T 34879-2017 and the following apply to this document.

3.1 Subsurface

The optically transparent region beneath the surface of a solid material.

Note. Usually the depth is within 100 microns.

3.2 Confocal microscopy; CM

Using constrained illumination and constrained detection, optical tomography images were obtained by axial scanning, and the maximum axial signal position was extracted to determine the A method for measuring the surface shape of a sample in a certain area.

[Source. GB/T 34879-2017, 3.1]

3.3

Based on the principle of confocal microscopy, annular light field constrained illumination and aperture matching constrained detection are used to obtain the surface and subsurface areas of the sample.

An optical instrument that detects dark-field scattering signals in the deep domain and obtains three-dimensional tomographic images of samples by axial scanning.

3.4 axialenvelope

The recorded detection signal corresponds to a function of the change in the axial position of a single image point in the confocal tomographic image.

[Source. GB/T 34879-2017, 3.8]

3.5

The ratio of the inner diameter to the outer diameter of the cross-section of the annular illumination beam measured at the objective entrance pupil.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 20 pages — is available in the English PDF.

Referenced standards

Editions of GB/T 44926

EditionTitleRevisionStatus
GB/T 44926-2024Nanotechnologies - Characterization of micro surface and sub surface - Optical dark-field confocal microscopycurrent editionCurrent

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