Optics: measuring and testing – For size of particles – By particle light scattering
Patent
1978-06-30
1980-11-11
Corbin, John K.
Optics: measuring and testing
For size of particles
By particle light scattering
250565, 250574, 356339, 356341, 356243, G01N 1502
Patent
active
042329671
ABSTRACT:
According to the invention, the instrument for measuring the sizes and quantity of particles in a fluid medium comprises a light-sensitive device which converts light scattered by particles in a flow of a fluid medium which crosses a beam emitted by a light source, as well as some part of the light of that beam, arriving from an element whose purpose is to simulate a calibrated particle, to electric pulses. The light-sensitive device is connected via a divider, whose purpose is to distribute pulses according to the sizes of particles, to signal inputs of respective threshold devices whose outputs are connected to inputs of counters with indicators. The element which simulates a calibrated particle is adapted to periodically change, in the course of measurement, the brightness of light received by the light-sensitive device. Interposed between the output of the light-sensitive device and reference inputs of the threshold devices is a circuit for converting output devices of the light-sensitive device to direct-current voltage which adjusts the trigger levels of the threshold devices according to the amplitude of a pulse arriving from the element which simulates a calibrated particle.
REFERENCES:
patent: 3127464 (1964-03-01), Gustavson
patent: 3819269 (1974-06-01), Duvall et al.
Kirsh et al., "Improvement and Calibration of an AZ Jet Type Photoelectric Aerosol Counter," Kolloidnyi Zhurual, vol. 37, No. 4, pp. 778-781, Jul.-Aug. 1975.
Berber Viktor A.
Grachev Konstantin A.
Pavlov Vladimir V.
Popov Alexei N.
Sokolov Viktor E.
Corbin John K.
Koren Matthew W.
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