Analysis of particle characteristics

Details Analysis of particle characteristics Analysis of particle characteristics

G - Physics

01

N

G01N 15/14 (2006.01) G01N 15/02 (2006.01) G01N 21/27 (2006.01) G01J 1/44 (2006.01) G01N 15/00 (2006.01)

Patent

CA 2130343

Apparatus for the analysis of individual particle characteristics from an aerosol or other suspension of particles includes: a scattering chamber (15) including an ellipsoidal reflector (17) having an orifice therein leading to a rear chamber (20); a monoch- romatic light source (10) adapted to transmit a collimated beam of light (11) along the main axis of the reflector (17); means (26, 27) for directing a stream of the particles through the beam of light (11) as substantially the main focus (60) of the reflector (17); a ccd video recorder (36) having a two dimensional array of a multitude of sensors arranged to image light scattered from a particle in the stream of particles; an optical system (17, 32, 33, 34) arranged to collect the scattered light from a solid angle of at least 3, around the region where the particle stream crosses the light beam (11); and a data processor (37). The detector (36) is associated with an imaging screen (35) positioned such that rays of light scattered from the particle and imaged thereon by the optical sys- tem (17, 32, 33, 34) are monotonically ordered with respect to the angle of scattering of the rays from the particle, the rear cham- ber (20) contains sensor means (25) for sensing scattered light not collected by the optical means (17, 32, 33, 34) and thereby de- termining the presence of a particle in the beam of light (11), the means (25) forming part of a trigger for triggering the video camera (36) to store an image associated with the particle, and the data processor (37) is adapted to compare parameters of the image with parameters stored in a memory to determine the nature of the particle.

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