Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent
1979-07-27
1981-11-10
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
324233, G01V 311, G01V 3165
Patent
active
043000975
ABSTRACT:
An induction balance metal detector circuit includes a receiver coil output which is connected to one input of a unique phase detector circuit. The reference transmitter coil signal is connected to a second input of the phase detector. The phase detector comprises circuitry which provides an output equal to the smaller of the two input signals. The output is doubled and integrated, then compared to a current indicative of the integrated reference signal in a differential amplifier. The output of the differential amplifier is passed through a dead band and used to excite a first indicator in response to phase difference between the inputs to the phase detector indicative of the location of ferrous metals. A second indicator is excited in the event the phase difference indicates the presence of non-ferrous metals. A balance and threshold control is established between the transmitter and the receiver coils in order to adjust the phase and amplitude of the received signal. A feedback loop is established between the ferrous metal output and the threshold and the balance control. The ferrous metal output is integrated to provide an indication of mineralized soil in the environment. This integrated output is utilized to change the impedance at the receiver coil in order to null out the effects of the mineralized soil. The circuitry is adapted for use in integrated circuit form.
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LeGaye, E. S., "The Electronic Metal Detector Handbook . . . ", Western Heritage Press, Sep. 1969, pp. 93-96.
Jacobson Harvey B.
Strecker Gerard R.
Techna, Inc.
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