Method and apparatus for correcting coincidence errors during counting of two types of particles
US4580093A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 1983 |
| Grant date | Apr 1, 1986 |
| Priority date | — |
| Expiry date | Jul 25, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N15/132
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.