| 摘要 |
PURPOSE:To measure blood platelets which are smaller in diameter than other blood cells with high accuracy by providing a multichannel analyzer which analyzes the output obtained by time pulse height conversion after discriminating the pulse heights of electric signals from photomultipliers of system A and B. CONSTITUTION:The light from the light source 1 of the system A passes through a part close to the sample injection flow passage 3 of a cell 4 and light from the light source 1' of the system B passes through a part distant from the flow passage 3 of the cell 4. The light from the light source 1 is incident on a photomultiplier 6 and the light from the light source 1' is incident on a photomultipler 6'. Scattered light beams incident on the photomultipliers 6 and 6' are converted by amplifiers 7 and 7' into pulses, which are supplied to pulse height discriminators 8 and 9. Signals passed through the discriminators 8 and 9 are supplied to a time pulse height converter 10, which outputs the time difference as a pulse signal by regarding the signal passed through the photomultiplier 6 as a start signal and the signal passed through the photomultiplier 6' as a stop signal; and the pulse signal is supplied to the multichannel analyzer 11 to measure blood platelets which are smaller in diameter than other blood cells with high accuracy.
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