Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-11-30
1989-05-02
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356336, G01N 1506
Patent
active
048271446
ABSTRACT:
A particle detecting device for detecting particles contained in a flowing sample fluid is provided which comprises a light beam irradiating mechanism for irradiating the sample fluid with a light beam, the light beam irradiating mechanism including a light beam deflecting portion for directing the light beam across the flow of the sample fluid and for causing the light beam to scan a predetermined irradiation region of the sample fluid, this scanning causing a portion of the light beam to be scattered by the particles in the irradiation region to produce scattered light; a light receiving mechanism for receiving the scattered light and for converting the scattered light to an electrical signal; and a signal processor coupled to the light receiving mechanism for processing the electric signal to obtain at least one of the number of particles in the sample fluid and a particle size distribution for the particles in the sample fluid. The electrical signal includes a series of pulse groups, each of the pulse groups comprising a plurality of pulses. Accordingly, the signal processor detects the peak value of the pulses of at least one of the pulse groups and/or detects the number of pulse groups.
REFERENCES:
patent: 3133445 (1964-05-01), Richard
patent: 3676647 (1972-07-01), Statton et al.
patent: 4094583 (1978-06-01), Kondo et al.
patent: 4701005 (1987-10-01), Nosuchi
Toyama Fumio
Zaitsu Yasushi
Fuji Electric & Co., Ltd.
Nelms David C.
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