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
056083165
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. A first coil is wound in a helix about the bobbin in the proximity of the debris collection chamber, wherein the induction of the first coil is responsive to the particle accumulation within the collection chamber. A reference coil is wound in a helix about the bobbin to compensate for changing fluid temperature. An oscillator is coupled to the first and reference coils for selectively energizing the coils with 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 nonferrous particles.
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Crayton John W.
Krone John J.
Oltman Terry D.
Walacavage Cecilia A.
Caterpillar Inc.
Donato Mario J.
Masterson David M.
Strecker Gerard R.
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