GB/T 21649.2-2025 Active National standards

GB/T 21649.2-2025 Particle size analysis—Image analysis methods—Part 2:Dynamic image analysis methods

Publish Date: 2025-06-30 Implement Date: 2026-01-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Basic Information

Standard Code: GB/T 21649.2-2025

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Screening, sieve plates, and sieve nets

ICS Name: Granularity analysis and sieving

Publish Date: 2025-06-30

Implement Date: 2026-01-01

Pages: 56 pages

Scope

This document describes a method of converting particles with relative motion into binary images in actual systems, where the particles in the image are separated into individual entities. The images of moving particles are created by optical image acquisition devices. The impact of particle motion on the image can be minimized by the instrument or corrected through software programs. This document is applicable to moving particle images that clearly differ from the background. In subsequent analysis, these binary images can be considered as static images, and their characterization methods are described in GB/T 21649.1—2024. Compared with static image analysis systems, dynamic image analysis systems can measure more particles. This document provides guidance for instrument qualification for particle size distribution measurement using standard particle samples. This document discusses in detail the relative motion of particles, the impact of particle motion on the image (motion blur), the movement and position of particles along the optical axis (depth of field), and the direction of relative motion between particles and the camera.