Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent
1997-11-25
1999-12-21
Strecker, Gerard
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
324232, 324233, G01V 311, G01V 3165
Patent
active
060053925
ABSTRACT:
A method for the operation and for the evaluation of signals of an eddy cent probe wherein a transmitting coil is supplied with alternating current with preferably three frequency components. The receiving coil signal corresponding to an a.c. voltage is broken down into corresponding frequency components and by phase-control rectification projection signals are formed corresponding to a real part or an imaginary part of the coil signal. From at least two, optionally individually amplified projection signals of the same type (real or imaginary signal) differential signals are formed. Finally, by the combination of at least two differential signals a combination signal is formed and evaluated. In particular, quotients and amount or value sums of differential signals are formed. The method offers decisive advantages in seeking mines in connection with the suppression of disturbing ground or soil signals and in the identification and classification of mines on the basis of signals from an eddy current probe. The method also makes it possible to use an eddy current probe as the ground probe.
REFERENCES:
patent: 4563644 (1986-01-01), Lenander et al.
patent: 4942360 (1990-07-01), Candy
patent: 5642050 (1997-06-01), Shoemaker
patent: 5654638 (1997-08-01), Shoemaker
Institut Dr. Friedrich Foerster Pruefgeraetebau GmbH & Co. KG
Strecker Gerard
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