Measuring and testing – Volume or rate of flow – Mass flow by imparting angular or transverse momentum to the...
Patent
1986-11-04
1988-03-15
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Mass flow by imparting angular or transverse momentum to the...
177185, G01F 100, G01G 1106
Patent
active
047304995
ABSTRACT:
In a system and a method for measuring the rate at which powdered material flows from a container wherein a first analog signal representing the weight of the container is produced, the analog signal is differentiated to obtain a second signal corresponding to the flow rate and the second signal is passed through an adaptive filter. The adaptive filter includes a first low pass filter having a first time constant for producing a third signal and a second low-pass filter to produce a fourth signal. The time constant of the second filter is varied between a minimum equal to the time constant of the first filter and a maximum equal to a preselected multiple of the time constant of the first filter by comparing the absolute value of the difference between the third and fourth signals to a preselected deadband and effecting the maximum time constant when the absolute value of the difference is less than the deadband and the minimum time constant when the absolute value of the difference is greater than the deadband. A combination signal is provided from the fourth signal during the time when the absolute value of the difference is less than the deadband and the third signal during the time when the absolute value of the difference is greater than the deadband. The combination signal is scaled to indicate the powdered material flow rate.
REFERENCES:
patent: 3855458 (1974-12-01), Motter et al.
patent: 4051431 (1977-09-01), Wurster
patent: 4277022 (1981-07-01), Holdsworth
patent: 4320855 (1982-03-01), Ricciardi et al.
patent: 4561808 (1985-12-01), Spaulding et al.
Bauman Stephen A.
Gianella Edward P.
Katz Bernard R.
Goldstein Herbert
Grimes E. T.
Ingham H. S.
Masselle F. L.
The Perkin-Elmer Corporation
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