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Terry L Oltman, 771918 Canterbury Dr UNIT E, Washington, IL 61571

Known as:
Terry L Altman Terry L Ouver
Related to:
Helen L Davis 83 Danielle M Davis 47

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Washington, IL   

Morton, IL   

Creve Coeur, IL   

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Us Patents

Apparatus For Detecting Particles In A Fluid And A Method For Operating Same

US Patent:
5608315, Mar 4, 1997
Filed:
Aug 21, 1995
Appl. No.:
8/517228
Inventors:
John W. Crayton - Washington IL
John J. Krone - Dunlap IL
Terry D. Oltman - Chillicothe IL
Assignee:
Caterpillar Inc. - Peoria IL
International Classification:
G01N 2774
G01R 3312
US Classification:
324204
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.

Apparatus For Detecting Particles In A Fluid And A Method For Operating Same

US Patent:
5608316, Mar 4, 1997
Filed:
Aug 21, 1995
Appl. No.:
8/518478
Inventors:
John W. Crayton - Washington IL
John J. Krone - Dunlap IL
Terry D. Oltman - Chillicothe IL
Cecilia A. Walacavage - East Peoria IL
Assignee:
Caterpillar Inc. - Peoria IL
International Classification:
G01N 2774
G01R 3312
US Classification:
324204
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.

Possible Relatives

Debra A Oltman  Dietrich E Oltman  Dolores P Oltman  John H Oltman  Kaven L Oltman  Kristin D Oltman  Marjorie P Oltman  Terry A Johnson  Terry L Standefer  Terry L Standish 

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