GB/T 21649.1-2024 Particle size analysis—Image analysis methods—Part 1:Static image analysis methods

Scope

This document specifies an image analysis method for measuring the particle size distribution of particles under test when their velocity relative to the optical axis of the imaging device is zero. The particles under test should be well dispersed and fixed on the object plane of the testing instrument. By moving the stage or the camera, the instrument's field of view can capture images of the particles on the object plane without causing motion blur in the particle images. The images are then analyzed.
This method is suitable for digital image analysis obtained through optical or electronic detection systems. This method does not involve the method of obtaining images, although the setting of detection parameters and calibration have a significant impact on the accuracy of particle size measurement. This method only involves the method of analyzing images by full pixel counting.
The type of size distribution (based on quantity or volume) and the width of the distribution have a great impact on the number of particles measured to ensure the expected test accuracy within a specified confidence interval. Examples are provided in Appendix A.
To obtain a sufficient number of measured particles to achieve the required measurement precision, automatic analysis techniques can be used.
This document does not address sample preparation. To ensure the accuracy and precision of the test results, the sampling, dispersion, and representative sampling of the particles under test are crucial steps in the operation process.
Note: Details on sampling and sample preparation are described in ISO 14887 and ISO 14488.

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