Patent · US Expired

Method and device for locating a metal line

US6411073B1 · kind B1 · utility

32Cited by

4References

11Claims

0Family size

Assignee

Hagenuk KMT Kabelmesstechnik GmbH · DE

Inventors

Gerhard Fischer · Offenbach, DE
Volker Fraedrich · Schmiedeberg, DE
Christoph Wendel · Laufenbürg, DE

Key dates

Filing date	May 30, 2000
Grant date	Jun 25, 2002
Priority date	—
Expiry date	Aug 3, 2020

Classification

Technology area (CPC G)Physics
CPC primaryG01D21/00
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A line locating device and method that is capable of determining the location of a line even when a significant amount of transmitted signal is coupled to neighboring lines. A device according to this invention includes a transmitter that couples a transmitted signal onto a metal line where the transmitted signal is a first signal having a carrier frequency modulated with second signal of a lower frequency. The device also includes a receiver that receives a received signal from the metal line and evaluates the signal in terms of period and polarity to determine an incoming signal or an outgoing signal. The receiver addresses an appropriate signaling unit in response to the incoming signal or the outgoing signal.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.