Electricity: measuring and testing – Magnetic – Fluid material examination
Patent
1989-12-22
1991-08-20
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Fluid material examination
324226, 324236, 73 64, 340641, G01N 2774, G01N 3328, G01R 3310, G08B 2100
Patent
active
050418564
ABSTRACT:
An arrangement for detecting metallic particles carried by a fluid includes a metallic probe member which surrounds an elongated passage through which the fluid flows and which is constituted by a split tube having two marginal portions delimiting a gap which extends along said passage and completely separates the marginal portions from one another. Capacitors are arranged at the gap and alternating electric current is caused to flow in the probe member around the passage so that the probe member and the capacitors form a tank circuit having resonance characteristics that are influenced by any inclusion then present in the passage in a manner dependent on the electromagnetic properties of the inclusion. The character of any metallic particle then present in the passage is determined from variations in the alternating electric current that reflect the influence of such metallic particle on the resonance characteristics.
REFERENCES:
patent: 4504788 (1985-03-01), Froncisz et al.
patent: 4926120 (1990-05-01), Veronesi
Reed Robert W.
Ringermacher Harry I.
Veronesi William A.
Weise Andrew P.
Ruzek Peter R.
Snow Walter E.
United Technologies Corporation
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