Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent
1987-07-16
1989-11-14
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
324233, 324239, G01V 311, G01V 3165
Patent
active
048810363
ABSTRACT:
A wire loop reference transmitter is coupled with the excitation winding and the receiver winding of metal detection apparatus and which can be alternately opened and closed through a switch. In another version the separation of the reference phase transmitter reference signal from other signals is accomplished by periodically turning the reference signal off and on at a predetermined switching frequency. According to a further version this separation is achieved by a phase control demodulator controlled by a switched-on reference signal of a first controllable phase and by a switched-off reference signal with a control signal to obtain a 180 degree second control phase. Still further, control signals of a phase controlled rectifier can be at 90 degrees to the reference signal of the reference phase transmitter.
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Auslander Klaus
Fabris Hans-Jurgen
Patzwaldt Wolfgang
Seichter Helmut
Institut Dr. Friedrich Forster Prufgeratebau GmbH
Netter George J.
Strecker Gerard R.
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