Coulter Electronics, Inc.

Stephen K Campbell

Walter R Hogg

Wallace H Coulter

Edward N Doty

Millard D Longman, Jr

Millard D Longman

A method and apparatus for correcting a particle pulse count subject to coincidence error is disclosed wherein particle pulses, developed in response to passage of particles in a particulate system through a sensing zone, are counted for a predetermined period of time. The predetermined period of time is increased or extended in response to each pulse counted by a time increment that is related to a characteristic of the counted pulse, such as the pulse width, duration, or amplitude. The total additional time period allows the counting of additional particle pulses such that the total count at the end of the extended time period is an error corrected count for the number of particles detected in the predetermined time period.

Method and apparatus for providing primary coincidence correction during

A method and apparatus are disclosed wherein each particle pulse developed in response to passage of particles in a particulate system through a sensing zone is integrated to develop a first voltage whose amplitude varies in accordance with the number of pulses. The pulses are also integrated to develop a second voltage whose amplitude varies in accordance with the duration and, therefore, the size of all of the particle pulses. The first and second voltages are multiplied together to yield an error corrected voltage representing an error corrected particle pulse count, which is then converted to an error corrected particle pulse count.

A method and apparatus for correcting a particle pulse count subject to coincidence error is disclosed wherein particle pulses, developed in response to passage of particles in a particulate system through a sensing zone, are counted for a predetermined period of time. The predetermined period of time is increased or extended in response to each pulse counted by a time increment that is a function of a characteristic of the counted pulse, such as the pulse width, duration, or amplitude. The total additional time period allows the counting of additional particle pulses such that the total count at the end of the extended time period is an error corrected count for the number of particles detected in the predetermined time period.

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Hialeah, FL, United States of America

Stephen K Campbell