Back to results
US 4,412,175 AGranted
Debris alarm
AssigneeCoulter Electronics, Inc.
InventorFranklin D. Maynarez
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeCoulter Electronics, Inc.
InventorFranklin D. Maynarez
Estimating the term…
Disclosed is an abnormal pulse detector for use with a particle analyzing apparatus of the Coulter.RTM. type for generating discrete particle pulses in response to liquid suspended particles passing through a sensing aperture, the abnormal pulse detector comprising: a bad pulse detector for generating a bad count pulse for each of the particle pulses which have a width that is either too long or too short, comparative pulse detector means for generating a comparative count pulse for each of the particle pulses or for each of the particle pulses not generating a bad count pulse, counter and comparator circuitry for counting the bad count pulses and the comparative count pulses and for obtaining the ratio of the bad count pulses to the comparative count pulses so as to indicate a alarm condition when the ratio reaches a predetermined, unacceptable level.
An abnormal pulse detector for use with a particle analyzing apparatus for studying particles in suspension, said apparatus including a particle sensing aperture through which said particles in suspension are passed, means for passing an electric current through said aperture simultaneously with passage of a particle through said aperture, and detecting means responsive to impedance variations for generating a discrete particle pulse with the passage of said particle through said aperture, said abnormal pulse detector comprising:
Dependencies are inferred from the claim text.