System and method for locating underground utilities...

Details System and method for locating underground utilities... System and method for locating underground utilities...

2007-10-16

2007-10-16

Patidar, Jay M (Department: 2862)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

For small object detection or location

C324S067000

Reexamination Certificate

active

11501618

ABSTRACT:
In a method of identifying a passive electromagnetic signal emitted from an underground utility, a portable above-ground antenna is disposed at a location at which the passive electromagnetic signal is expected. Measurement signals are received from the antenna corresponding to electromagnetic signals received by the antenna. The measurement signals are measured at a plurality of different frequency bands within a measurement frequency range expected to include a frequency of the passive electromagnetic signal, and at least one of the plurality of frequency bands is selected based on a predetermined criteria applied to the measurements.

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Operation Manual for “Micro-Computerized Pipe & Cable Locator,” Takachiho Sangyo Co., LTD.

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