Electricity: measuring and testing – Determining nonelectric properties by measuring electric... – Erosion
Patent
1973-10-16
1976-06-15
Rolinec, R. V.
Electricity: measuring and testing
Determining nonelectric properties by measuring electric...
Erosion
307235N, 328116, G01N 2700, H03K 520
Patent
active
039639835
ABSTRACT:
The pulse amplitude discriminating circuit is utilized in a system where particles in a fluid are caused to flow through a sensing zone and a particle pulse is generated for each particle sensed with the amplitude of each pulse being related to the size of the particle sensed. The discriminating circuit is operative to determine which pulses have an amplitude falling between predetermined upper and lower amplitude levels, for remembering each pulse while the determination is being made and for passing to a pulse analyzing circuit only the pulse heights of those remembered pulses which have an amplitude falling between the predetermined upper and lower amplitude levels. The pulse discriminating circuit includes first and second comparators for determining whether or not the particle pulse exceeds the lower and upper amplitude levels, a sample and hold circuit for remembering the pulse height of the particle pulse while the determination of pulse amplitude is being made, and control circuitry couple to the comparators and to an electronic switch between the output of the sample and hold circuit and the pulse analyzing circuit and operative to close the electronic switch when the output signal from the first comparator changes as a result of the trailing edge of the particle pulse is falling below the lower amplitude level with no change occurring in the output of the second comparator as the result of the amplitude of the particle pulse not exceeding the upper amplitude level.
REFERENCES:
patent: 3221253 (1965-11-01), Keyes
patent: 3392331 (1968-07-01), Coulter
patent: 3412330 (1968-11-01), Klaver
patent: 3670150 (1972-06-01), Hogg et al.
patent: 3699319 (1972-10-01), Berg
patent: 3701029 (1972-10-01), Hogg
patent: 3783247 (1974-01-01), Klein et al.
Coulter Electronics Inc.
Karlsen Ernest F.
Rolinec R. V.
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