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Title:
CABLE TRACKING SYSTEM
Document Type and Number:
Japanese Patent JPS56108986
Kind Code:
A
Abstract:

PURPOSE: To detect the position of a cable by utilizing the phenomenon that the phase of the detection signal of a magnetic-field detection sensor is inverted across the point right over the cable.

CONSTITUTION: From the end of objective cable 5, a signal current is supplied by AC signal supply part 4, and with it, magnetic-field detection sensor part 1 detects an AC magnetic field generated around cable 5. Magnetic-field detection sensor part 1 consists of magnetic-field detection sensors 101W108 arranged so that maximum sensitivity directions of detection directivity will be equal and nearly in parallel to the horizontal surface, and one phase reference magnetic-field detection sensor 110 arranged at right angles to the direction of those sensors 101W108. Of the detected signal, only the magnetic-field signal components are amplified by signal reception part 2 and then signals of detection sensors 101W108 are detected synchronously with the signal of magnetic-field detection sensor 110. Signal processing display part 3 discriminates the polarity of the signal and, according to the polarity, turns on-off a display lamp to display the position of the cable.


Inventors:
SHIRASAKI YUUICHI
IWAMOTO YOSHINAO
SUZUKI SHIZUO
ASAKAWA KENICHI
Application Number:
JP1980000011537
Publication Date:
August 28, 1981
Filing Date:
February 04, 1980
Export Citation:
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Assignee:
KOKUSAI DENSHIN DENWA CO LTD
International Classes:
G01N27/72; G01V3/06; G01V3/08; G01V3/10; G01V3/11; G01V3/12; (IPC1-7): G01N27/72; G01V3/08
Domestic Patent References:
JPS5028401A1975-03-24



 
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