Electricity: measuring and testing – Magnetic – Fluid material examination
Patent
1995-08-21
1997-03-04
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Fluid material examination
324225, 324232, 324236, 340631, G01N 2774, G01R 3312
Patent
active
056083157
ABSTRACT:
In one aspect of the present invention, an apparatus for detecting particles within a fluid is disclosed. A bobbin defines a debris collection chamber. Spaced apart first and second coils are wound about the bobbin in the proximity of the debris collection chamber, wherein the inductance of the coils are responsive to the particle accumulation within the collection chamber. An electromagnet is wound about the second coil to attract ferrous particles into the proximity of the second coil. A reference coil is wound about the bobbin to compensate for the changing temperature of the fluid. An oscillator is coupled to the first, second and reference coils for selectively producing an oscillating waveform at a frequency that induces eddy currents in the particles. The frequency of the oscillating waveform is indicative of the amount of accumulation of both the ferrous and non-ferrous particles.
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Crayton John W.
Krone John J.
Oltman Terry D.
Caterpillar Inc.
Donato Mario J.
Masterson David M.
Strecker Gerard R.
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