Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1996-06-07
1999-07-27
Patidar, Jay M.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324326, G01V 310, G01N 2772
Patent
active
059296348
ABSTRACT:
A device is provided for generating a detection signal upon occurrence of metallically conductive parts in an at least substantially non-conductive conveyor stream in which device an electromagnetic alternating field is established by an alternating current generator via a transmitting coil system in a section of the conveyor stream to be monitored, the amplitude and phase variations of the alternating field triggered when a part passes being detected by a receiving coil system and a subsequent evaluation circuit in the form of a phase variation signal and an amplitude variation signal. A stage for vectorial addition of the two variation signals and a phase comparator are provided. On the one hand, the vectorial composite signal is fed to the phase comparator, and on the other hand, one of the two variation signals is fed to the phase comparator. The output signal (phase angle signal) corresponds to the phase angle between the vectorial composite signal and one of the two variation signals. The phase angle signal is supplied via an evaluation stage that converts it into a control signal evaluated in a material-specific manner, which control signal controls an adjustable output stage that emits a material-specific detection signal for a part to be detected which is located in the conveyor stream.
REFERENCES:
patent: 4700139 (1987-10-01), Podhrasky
patent: 4868910 (1989-09-01), Maulding
patent: 5315243 (1994-05-01), Kempster et al.
patent: 5426362 (1995-06-01), Ninnis
Julian Wilburn, "Detecting Metal Particles", Automation, Dec. 1965, pp. 82-88.
Charles Brister, "Factors to Consider When Selecting Metal Detector Systems", Automation, Feb. 1967, pp. 69-73.
H. Abbas et al., "The Detection and Location of Foreign Metal Objects in Conveyed Products", Transactions of the Institute of Measurement and Control, vol. 8, No. 2, Apr.-Jun. 1986.
Firma Mesutronic Geratebau GmbH
Patidar Jay M.
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