Direct measurement of particle size and particle shape.
Automated imaging is a high resolution direct technique for characterizing particles. Individual particle images are captured from dispersed samples and analyzed to determine their particle size, particle shape and other physical properties. Statistically representative distributions can be constructed by measuring 10’s to 100’s of thousands of particles per measurement.
Static imaging systems require a stationary dispersed sample, whereas in dynamic imaging systems the sample flows past the image capture optics. The technique is often used in conjunction with ensemble based particle sizing methods such as laser diffraction to gain a deeper understanding of the sample or to validate the ensemble based measurements. Typical applications include:
- Measurement of shape differences where particle size alone does not give differentiation.
- Detection and/or enumeration of agglomerates, oversized particles or contaminant particles.
- Size measurement of non-spherical particles such as needle shaped crystals.
- Validation of ensemble based particle size measurements such as laser diffraction.