Optical instruments for measuring particle sizes

Details Optical instruments for measuring particle sizes Optical instruments for measuring particle sizes

1988-01-15

1989-06-27

Willis, Davis L.

Optics: measuring and testing

For size of particles

By particle light scattering

356338, 356341, G01N 2153, G01N 1502

Patent

active

048424064

ABSTRACT:
In an optical instrument for measuring particles in the size range of 0.5 microns to 300 microns, a laser beam is caused to pass through a sample stream of liquid containing particles to be measured. A photodetector detects a portion of the direct laser beam passing through the sample stream and the amplitudes of the pulses generated by this first photodetector provide a measurement of particles in the size range of 10 to 50 microns. A second photodetector detects forward scattered light from the laser beam passing through the liquid sample stream. The amplitudes of pulses generated by the second photodetector provide a measurement of pulses in the size range of 0.5 microns to 10 microns and the durations of pulses generated by the second photodetector provide a measurement of pulses in the size range of 50 to 300 microns.

REFERENCES:
patent: 3797937 (1974-03-01), Shofner
patent: 3830568 (1974-08-01), Allen
patent: 4015135 (1977-03-01), Tipton, Jr.
patent: 4265538 (1981-05-01), Wertheimer
patent: 4348111 (1982-09-01), Goulas et al.
patent: 4596464 (1986-06-01), Hoffman et al.
"High-Speed Single Particle Sizing by Light Scattering in a Flow System", G. C. Salzman et al., Society of Photo Optical Instrument Engineering, vol. 220, Optics in Metrology and Quality Assurance (1980), pp. 23-27.

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