Abstract
As to laser Doppler velocimeter, the relation between the visibility and the diameter of a seeding particle was calculated by the simple method assuming that the intensity of scattered light from the particle is proportional to the integrated intensity of interference fringes on particle.
The analytical results using this method accurately agreed with the experimental results that were obtained by using newly developed wire disc and water channel disc respectively, which can correctly determine particle diameter, and it was clarified that fine wire diameter or particle diameter can be measured from the visibility.
Next, systematic measurements were carried out on the beam intersecting angle, the intensity ratio of two beams, the density of particles, the dimensionless aperture radius, the backward and forward scattering and the presence of plural particles in the measuring volume, and the relation between seeding particle size and the output characteristics of a laser Doppler velocimeter was clarified.
