Beam forming apparatus for aerodynamic particle sizing system

Details Beam forming apparatus for aerodynamic particle sizing system Beam forming apparatus for aerodynamic particle sizing system

1988-09-09

1990-04-17

Willis, Davis L.

Optics: measuring and testing

For size of particles

350169, 356 36, G01N 1514, G01N 2185

Patent

active

049174940

ABSTRACT:
Apparatus, intended primarily for use in an aerodynamic particle sizing system, for generating a pair of closely-spaced light beams, each having a thin, elongated cross-sectional shape. Particle sizes are determined by directing a particle stream through the light beams and measuring the times of flight of particles between the two light beams. The apparatus for generating the light beams includes a laser source and beam forming optics. In one embodiment, a first light beam is formed at the particle stream by a cylindrical lens. After passing through the particle stream, the first light beam is reflected and focused to form a second light beam at the particle stream that is displaced from the first light beam. The first light beam can be reflected and focused by a concave cylindrical mirror or, alternatively, by a flat mirror and a convex cylindrical lens. In another embodiment, the incident light beam from the laser source is passed through a diffraction grating which provides a zero order lobe and a first order lobe. The zero order lobe and the first order lobe are focused at a particle stream by a cylindrical lens to form the first and second beams.

REFERENCES:
patent: 4804263 (1989-02-01), Schodl
Blackford et al., "Particle Size Analysis with an Aerodynamic Particle Sizer . . . ", Proc. 11th Annual Powder & Bulk Solids Conf., Rosemont, IL, pp. 615-623, 5/86.

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