Method and circuit for producing measuring pulses in a particle

Details Method and circuit for producing measuring pulses in a particle Method and circuit for producing measuring pulses in a particle

1978-07-12

1981-07-07

Tokar, Michael J.

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

Erosion

G01N 2700

Patent

active

042777437

ABSTRACT:
A method of, and circuit for, producing measuring pulses in a particle analyzer for the analysis of particles suspended in a liquid, especially blood cells, comprising a conductivity or measuring cell, whose impedance between two terminals of the conductivity cell changes upon passage of a particle through such conductivity cell. A controllable current supply powers the conductivity cell with a current regulated to maintain a reference value corresponding to a control value. A receiver functioning as a high-pass filter and having high input impedance serves for the essentially currentless removal of a potential between the terminals of the conductivity cell and for forming a receiver signal corresponding to such components of such potential whose frequency is above a threshold or cut-off frequency corresponding to the high-pass filter. The control value is formed from the sum of a predetermined reference value and the received signal. There is formed a measuring signal proportional to the difference of the control value and the reference value and whose timewise changes correspond to the measuring pulses.

REFERENCES:
patent: 3706030 (1972-12-01), Klein et al.
patent: 3924180 (1975-12-01), Salzman et al.
patent: 3993948 (1976-11-01), Epstein
patent: 4093849 (1978-06-01), Baxter et al.

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