Dynamic spot calibration for automatic particle counters

Details Dynamic spot calibration for automatic particle counters Dynamic spot calibration for automatic particle counters

1981-07-27

1984-03-06

Kazenske, E. R.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

356243, G01N 1502

Patent

active

044346476

ABSTRACT:
The invention is a dynamic spot calibration system (60) and process for calibrating, both for sizing and counting, an automatic particle counter (APC) (42). The APC includes a sensor (38) which uses a light source that focuses through a sensing window (48) onto a sensor element. The system (60) includes a probe (62) which carries a spot (64) of known size. A receiver (66) grips one end of the probe (62) and is attached to an electromagnetic driver (70) which, when activated and driven by an oscillator (72)-amplifier (74) arrangement, interposes the spot (64) into, and out of, the fluid passage defined by the sensing window (48). The probe is precisely positioned in relation to the window (48) by an adjustable mounting system including a pedestal (76), a vertically adjustable arm (78), and a graduated helical rack (84).

REFERENCES:
patent: 2791696 (1957-05-01), Schell
patent: 3127464 (1964-03-01), Gustavson
patent: 3412037 (1968-11-01), Gochman
patent: 3867835 (1975-02-01), Button
patent: 3885415 (1975-05-01), Burns et al.
patent: 4135821 (1979-01-01), Pechin et al.
patent: 4232967 (1980-11-01), Grachev et al.

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