Electricity: measuring and testing – Determining nonelectric properties by measuring electric... – Particle counting
Patent
1989-05-31
1990-11-20
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Determining nonelectric properties by measuring electric...
Particle counting
324 711, G01N 2704
Patent
active
049721372
ABSTRACT:
A particle counter, of the type utilizing a Coulter(R) type aperature and a suction flow path downstream from the aperture, has a pair of electrodes on both sides of the aperture. A current is provided from the downstream electrode to the upstream electrode and pulses in the resulting voltage across the aperture are monitored to detect the passage of blood cells through the aperture. A grounded electrode is placed in the downstream flow path at a position near the package panel to isolate the cell counter from external electrical noise signals. An isolated high input inpedance amplifier is coupled to provide the monitored voltage to an inserted electrode positioned between the downstream aperture electrode and the grounded panel electrode. Because the inserted electrode and downstream electrode are then at the same voltage, no current flows through that portion of the flow path.
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Dunstan Gerald J.
Gilbert Ian D.
Barron Harry W.
Coulter Electronics Inc.
Eisenzopf Reinhard J.
Harvey Jack B.
Hibnick Gerald R.
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