Registers – Transfer mechanism – Traveling pawl
Patent
1974-08-06
1976-03-16
Wise, Edward J.
Registers
Transfer mechanism
Traveling pawl
324 71CP, 235 92PC, G01N 1502, G06G 712
Patent
active
039447979
ABSTRACT:
An apparatus for determining the correct particle sizes at predetermined percentiles of the size distribution of a particulate system having a known size distribution characteristic such as for example a normal or log-normal size distribution, wherein a portion of the particles are too small to be measured. The particulate system is first passed through a particle detecting device which can be of the Coulter type. The particle detecting device produces particle pulses proportional to the size of the particles in the particulate system which can be measured. At least three percentile size determining circuits receive the particle pulses and develop first, second and third particle size signals respectively, indicating the size of the particles in the particulate system at the first, second and third predetermined percentiles. Two of the size signals are combined in a particular manner based on the known size distribution characteristic for the type of particulate system to yield a combined signal which approximates or is and estimate of the third percentile signal. The combined signal is compared with the measured third signal to obtain an error signal. The error signal is used in turn to add into all three size percentile circuits compensation or correction signals for the total volume of particules too small to be included in the measurements. This process causes the error signal to decrease toward zero, and results in all three circuits having outputs truly representative of their nominal percentiles.
REFERENCES:
patent: 3557352 (1971-01-01), Hogg et al.
patent: 3812335 (1974-05-01), Coulter et al.
Coulter Wallace H.
Hogg Walter R.
Coulter Electronics Inc.
Wise Edward J.
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