Re-entrant illumination system for particle measuring device

Details Re-entrant illumination system for particle measuring device Re-entrant illumination system for particle measuring device

1995-06-12

1996-10-15

Pham, Hoa Q.

Optics: measuring and testing

For size of particles

By particle light scattering

356338, G01N 1502

Patent

active

055659845

ABSTRACT:
Small, mobile particles in a fluid are optically detected by an apparatus having spaced apart reflectors bordering and defining an optical cavity into which a light beam is introduced. The reflectors are arranged along axes which are slightly misaligned such that the light beam is introduced at a low angle, barely over the edge of one of the reflectors, and is repeatedly reflected between the two reflectors, overlapping itself many times in a view volume located within the optical cavity, thereby increasing the intensity of detected particles. A fluid flow is introduced into the view volume and the light scattered by particles as they pass through the intensely illuminated view volume is received by a detector which observes the view volume. The detector produces a signal which is indicative of characteristics such as the number or size of particles.

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