Corpuscle-detecting apparatus having sensitivity adjustment

Details Corpuscle-detecting apparatus having sensitivity adjustment Corpuscle-detecting apparatus having sensitivity adjustment

1993-02-09

1994-10-04

Wieder, Kenneth A.

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

Particle counting

324710, 377 12, G01N 2702

Patent

active

053529758

ABSTRACT:
An apparatus for detecting corpuscles such as blood cells. The apparatus has an aperture and a constant-current source that supplies an electrical current to the aperture for detection of corpuscles. When corpuscles to be investigated pass through the aperture, the electrical impedance changes, producing a signal (herein referred to as the corpuscle signal). The apparatus further includes a pseudo signal-generating means for producing a pseudo signal in the form of pulses. The pseudo signal has a peak value proportional to the amplitude of the input current and is equivalent to the corpuscle signal detected when the corpuscles pass through the aperture. A signal selector means is disposed among the aperture, the constant-current source, and the pseudo signal-generating means. The signal selector means assumes either a first state or a second state. In the first state, the current from the power supply is supplied to the pseudo signal-generating means, and the pseudo signal produced by the pseudo signal-generating means is supplied to the aperture. In the second state, the current from the power supply is supplied to the aperture.

REFERENCES:
patent: 3316896 (1967-05-01), Thomasset
patent: 3691381 (1972-09-01), Kleppner
patent: 3745455 (1973-07-01), Haigh
patent: 3970928 (1976-07-01), Kachel
patent: 4218610 (1980-08-01), Baxter, Jr. et al.
patent: 4804909 (1989-02-01), Fink

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