Method and apparatus for correcting coincidence errors during co

Details Method and apparatus for correcting coincidence errors during co Method and apparatus for correcting coincidence errors during co

1983-07-25

1986-04-01

Levy, Stewart J.

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

Particle counting

377 11, G01N 2700, G06M 1104

Patent

active

045800936

ABSTRACT:
During a predetermined measuring time there are generated electrical pulses in a detector arrangement, each of these electrical pulses corresponding to a respective particle which is to be counted. The pulse amplitude of the electrical pulses corresponds to the particle size. In a discriminator circuit the electrical pulses are compared with a threshold value. Those pulses, the pulse amplitude of which exceeds the threshold value, are inputted to a counter circuit and a time measuring circuit for measuring the total time duration of the electrical pulses. All of the electrical pulses are delivered to a further counter circuit and a time measuring circuit. The digital values derived from both counter circuits and both time measuring circuits are infed to a digital computer in which there is computed according to the equation Z.sub.T *=(Z.sub.S -Z.sub.E).multidot.T.sub.S /(T.sub.S -T.sub.E) a count result Z.sub.T * for the pulses, the pulse amplitude of which does not exceed the threshold value. This count result Z.sub.T * has been corrected by the cross-coincidence error.

REFERENCES:
patent: 3936741 (1976-02-01), Coulter
patent: 3938038 (1976-02-01), Campbell
patent: 3940691 (1976-02-01), Hogg
patent: 4009443 (1977-02-01), Coulter et al.
patent: 4447883 (1984-05-01), Farrell

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