Apparatus and method for sizing particles

Details Apparatus and method for sizing particles Apparatus and method for sizing particles

1982-01-25

1984-10-16

Willis, Davis L.

Optics: measuring and testing

For size of particles

356349, G01B 905

Patent

active

044771878

ABSTRACT:
The disclosed invention employs an optical heterodyne technique that depends upon coherent detection of phase modulated light from individual particles, and does not depend on measurement of light scattered at a specific angle from particles. A collimated coherent beam of light is generated and separated into a subject beam and a reference beam. The subject beam is focused at the inspection region and light is gathered from the inspection region. The gathered light and the reference beam are combined and a photodetector is responsive to the combined light for producing an electrical signal representative of the combined light. The phase shift of light scattered from an individual particle passing through the inspection region is then determined by measuring the power in the phase modulated sidebands of the electrical signal. The phase shift is indicative of the size of the particle passing through the inspection region.

REFERENCES:
patent: 3539262 (1970-11-01), Pryor
patent: 4097153 (1978-06-01), DeRemigis

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