Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1995-08-31
1997-09-30
Chilcot, Richard
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
G01F 156
Patent
active
056728310
ABSTRACT:
An apparatus for measuring the flow rate of a liquid in a line includes a capacitor formed by a pair of electrodes. A charging circuit produces a charging current of constant magnitude. The charging current is used to charge the capacitor to a predetermined voltage. A timing circuit measures the time between the time at which the charging circuit begins to produce the charging current and the time at which the capacitor has been charged to the predetermined voltage. The timing circuit produces a pulse width modulated signal. The magnitude of the pulse width modulated signal is indicative of the time difference.
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SAE Technical Paper Series --910497 Feb 25-Mar. 1, 1991 "A Capacitive Oil Deterioration Sensor".
Codina George
Murr Donna J.
Ramamoorthy Chandrasekar
Caterpillar Inc.
Chilcot Richard
Masterson David M.
Patel Harshad
Yee James R.
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