公开(公告)号：US20170082769A1

公开(公告)日：2017-03-23

申请号：US15126454

申请日：2015-03-13

Applicant: Fuji Tecom Inc.

Inventor： Masaru TSUNASAKI ,  Kenshi KUBOTA

IPC: G01V3/10 ,  G01V3/06

CPC classification number: G01V3/10 ,  G01V3/06 ,  G01V3/15

Abstract: A detection method and detection device of buried metal which are capable of detecting singular points, in horizontal and vertical directions, of metal tubes, telecommunication cables, and electric power cables, or the like buried in the ground. A magnetic field component of the direction of 3 axes of a XYZ axis is detected by two or more magnetic sensors installed in the detectable direction, and detects a magnetic field induced to buried metal. While carrying out synchronous detection of these magnetic field components and calculating for each amplitude and each phase of a magnetic field component of the direction of 3 axes, image processing is carried out and it is outputted to a display. While calculating for the position of a singular point, a singular point distinguishes whether it is an over-crossing state, it is an under-crossing state, or it is a branched state from these image data

公开(公告)号：US20230152180A1

公开(公告)日：2023-05-18

申请号：US17919450

申请日：2021-04-15

Applicant: Fuji Tecom Inc.

Inventor： Takashi KOJIMA ,  Kenshi KUBOTA ,  Yasuhito SEKIGUCHI ,  Takahiro MIKAMI

IPC: G01M3/24

CPC classification number: G01M3/243

Abstract: To provide a buried-pipe damage location detection device that detecting damage location of buried-pipe buried in the ground etc., having a few manual operation buttons, and having a universal design that can be used by both right-handed and left handed inspector.

公开(公告)号：US20180067224A1

公开(公告)日：2018-03-08

申请号：US15563332

申请日：2016-03-10

Applicant: FUJI TECOM INC.

Inventor： Masaru TSUNASAKI ,  Kenshi KUBOTA

IPC: G01V3/08

CPC classification number: G01V3/08 ,  G01V3/12

Abstract: To provide a method and device for detecting buried metal, whereby it is possible to radio (wirelessly) transmit a synchronizing signal, and, when the frequency band of the transmission signal is restricted, to problem synchronous detection using a reference signal having a frequency equal to or greater than the frequency band. A method for detecting buried metal using synchronous detection method having a transmitting side device that transmits a transmitting signal (alternating current) to a buried metal for detection and transmits a synchronizing signal for synchronous detection, and a receiving side device for measuring the position and burial depth of the buried metal by detecting a magnetic field generated by the transmitting signal flowing in the buried metal with a magnetic sensor and processing amplitude and phase of the magnetic field, the method including: generating a standard signal of frequency f in the transmitting side device, and n dividing this standard signal to convert it to a transmitting signal of frequency f/n, transmitting this transmitting signal to the buried metal, m dividing the standard signal to convert it to a synchronizing signal of frequency f/m, transmitting this synchronizing signal from the transmitting side device by radio. Receiving the synchronizing signal by the receiving side device, m multiplying this received synchronizing signal to convert it to the standard signal. N dividing this converted standard signal to convert it to a reference signal of frequency f/n. Detecting a magnetic field generated by the transmitting signal flowing in the buried metal and synchronously detecting with the reference signal.