Photophoretic velocimetry--a new way for the in situ determination of particle size distribution and refractive index of hydrocolloids.

The migration of particles induced by the forces of light is known as photophoresis. The photophoretic velocity of particles under the influence of a strong light source, e.g. a laser beam, is recorded and measured by means of digital image processing which is called photophoretic velocimetry (PPV). The photophoretic velocity depends on the particle size as… (More)