Electricity: measuring and testing – Magnetic – Displacement
Patent
1978-12-12
1982-12-21
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Displacement
324202, G01B 714, G01R 3500
Patent
active
043651968
ABSTRACT:
A transducer having a field creating coil arrangement which produces a field having a field strength minimum, having a sensing coil positioned at that field strength minimum and responsive to changes in position of that minimum resulting from the proximity of an article to the field creating coil arrangement. By observing changes in the signal output of the sensing coil, information concerning the proximity of an article to the transducer is ascertained. Preferably the transducer includes a field disturbing means associated therewith for inducing a disturbance to the field created by the field creating coil so as to cause the sensing coil to operate by either simulating the disturbance of the field that would be caused by the proximity of an article or by changing the field while the article is present. Thus the transducer may be remotely checked as to its operation.
REFERENCES:
patent: 3253099 (1966-05-01), Hess
patent: 3395341 (1968-07-01), Malaquin
patent: 3397347 (1968-08-01), Hoeppel
patent: 3404493 (1968-10-01), Westover et al.
patent: 3456132 (1969-07-01), Dechelotte
patent: 3467855 (1969-09-01), Rance
patent: 3491289 (1970-01-01), Petrini
patent: 3633615 (1972-01-01), Rhodes
patent: 4064452 (1977-12-01), Toth
patent: 4066962 (1978-01-01), Jaffe
Crowe, "Calibration of Eddy-Current Systems with Simulated Signals," Materials Evaluation, Sep. 1977, pp. 59-64.
French, "Integrity Checker for Magnetic Vehicle Detector", IBM Tech. Bulletin, Jun. 1965, p. 71.
Snow Walter E.
Strecker Gerard R.
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