Electrical sensing system for measuring ferrous particles within

Details Electrical sensing system for measuring ferrous particles within Electrical sensing system for measuring ferrous particles within

1987-08-31

1989-10-31

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Fluid material examination

324225, 324232, 324234, 340631, G01N 2774, G01R 3312

Patent

active

048780197

ABSTRACT:
A magnetic sensor for the collection and measurement of ferrous particles through the use of an electronic tuned circuit is disclosed. The sensor contains an electrical inductance along with an integral magnet to attract ferrous particles suspended in the fluid. The ferrous particles collecting on the magnetic surface of the sensor causes a change in the inductance of the integral coil which is measured by an electronic circuit. The electronic circuit operating in conjunction with the sensor utilizes a parallel tuned resonant circuit and time variant frequency multiplying to eliminate undesired response changes of the tuned circuit due to the temperature change of the sensor. The sensor may be located in environmental conditions which include a large variation in ambient temperature. The disclosed invention provides for compensation of such undesired changes caused by temperature change so that the actual change of the inductance in the sensor can be monitored without interference. The signal output from the circuit disclosed is representative of the amount of ferrous debris accumulated on said sensor.

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