Particle measuring apparatus and its calibration method

Details Particle measuring apparatus and its calibration method Particle measuring apparatus and its calibration method

1998-04-15

2000-05-16

Buczinski, Stephen C.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

356355, G01P 336, G01B 1102

Patent

active

060644737

ABSTRACT:
In a particle measuring apparatus using laser Doppler velocimeter, it is intended to facilitate calibration of the apparatus for measuring the shape of particle. Laser beams passing through a first intersecting region M1 which is a measuring region are intersected again by using condenser lenses 21 and 22, and a second intersecting region M2 is formed. The intersecting region M2 is magnified by a magnifying lens 23. An optical bundle fiber 24 is brought closer from afar to the lens 23, and set at a position where AC component is not formed. As a result, the size of the incident portion of each optical fiber 24i and the fringe interval d.sub.f may be matched equivalently, so that the absolute value of the shape of particle may be obtained.

REFERENCES:
patent: 3830568 (1974-08-01), Allen
patent: 4537507 (1985-08-01), Hess
patent: 4859055 (1989-08-01), Gal et al.
patent: 4997272 (1991-03-01), Dopheide et al.

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