Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent
1991-09-19
1993-03-16
Snow, Walter E.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
324 67, G01V 308, G01V 310, G01R 1900
Patent
active
051948125
ABSTRACT:
Apparatus for locating buried objects such as underground pipes, cables or the like where a transmitter (1) generates an alternating current signal which is fed into the object to produce an alternating field emanating from the object, and a receiver (2) locates this radiation to identify the position of the object. A secondary transmitter (T) transmits a reference signal of the same frequency and phase as the original signal, and a signal processor in a receiver (2a) combines the two signals to eliminate the effects of noise.
REFERENCES:
patent: 3991363 (1976-11-01), Lathrop
Snow Walter E.
Yokoi Manufacturing Co., Ltd.
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