Method and apparatus for providing primary coincidence correction during particle analysis
AssigneeCoulter Electronics, Inc.
InventorStephen K. Campbell
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Abstract
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.
Claims21
A method for automatically correcting a particle pulse count subject to coincidence error wherein particle pulses are developed in response to passage of particles in a particulate system through a sensing zone, including the steps of:
- developing a first signal which varies in accordance with the number of particle pulses,
- developing a second signal which varies in accordance with the duration of the particle pulses,
- combining said first and second signals to develop an error corrected signal representing the error corrected particle pulse count.
An apparatus for automatically correcting a particle pulse count subject to coincidence error wherein particle pulses are developed in response to passage of particles in a particulate system through a particle sensing device, said apparatus including in combination,
- accumulation means operative in response to said particle pulses to develop a first signal which varies in accordance with the number of particle pulses,
- error correction means operative in response to the duration of said particle pulses to develop a second signal which varies in accordance with the duration of said particle pulses,
- combining means coupled to said accumulation means and said error correction means and operative to combine said first and second signals to develop an error corrected signal representing the error corrected particle pulse count.
In a particle analyzer subject to coincidence error wherein particle pulses are developed in response to passage of particles in a particulate system through a sensing zone, the improvement comprising,
- accumulation means operative in response to said particle pulses to develop a first signal which varies in accordance with the number of particle pulses received,
- error corrections means operative in response to the particle pulses to develop a second signal which varies in accordance with the duration of particle pulses,
- combining means coupled to said accumulation means and said error correction means for combining said first and second signals to develop an error corrected signal representing the error corrected particle pulse count.
Dependencies are inferred from the claim text.