# US 10,371,850 B2 · Neutrally buoyant magnetic sensor for borehole magnetometer

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- Number: US 10,371,850 B2
- Document ID: US10371850B2
- Status: Granted
- Kind: B2
- Application number: 15/814,553
- Filed: 2017-11-16
- Published: 2019-02-07
- Granted: 2019-08-06
- Earliest claimed: 2017-08-03
- Assignees: Aat Co. Ltd.
- Applicants: Aat Co. Ltd.
- Inventors: Kyung Soo Bahk; Chang Shik Lee; Kyu Jung Kim; Sang-Mook Lee
- Web page: https://patentgrep.com/patent/US10371850B2

## CPC

- G01V 3/26: operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device (with electromagnetic waves G01V3/30)
- G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02)

## Abstract

A magnetic sensor for borehole magnetometer includes an upper-opened pipe-shaped housing; a frame installed at an inside of the housing; an upper-opened magnetic sensor part installed at a bottom side of the frame; a lid covering the opened upper side of the magnetic sensor part; and a magnetic sensor disposed at an inside of the magnetic sensor part to measure a magnetic force, wherein an upper side and a bottom side of the magnetic sensor is respectively installed with a spring, a bottom side of the lid and the magnetic sensor part are formed with a fixing groove for fixing an upper spring and a bottom spring each installed at an upper side and a bottom side of the magnetic sensor.

## Claims

### Claim 1

A magnetic sensor for borehole magnetometer, the magnetic sensor for borehole magnetometer comprising:
an upper/bottom-opened pipe-shaped housing;
a frame installed at an inside of said upper/bottom-opened pipe-shaped housing;
an upper-opened magnetic sensor part installed at a bottom side of said frame;
a lid covering an opened upper side of said upper-opened magnetic sensor part;
a magnetic sensor disposed at an inside of the said upper-opened magnetic sensor part to measure a magnetic force;
an upper spring coupled to an upper side of said magnetic sensor;
a bottom spring coupled to a bottom side of said magnetic sensor;
a first fixing groove is formed on a bottom surface of said lid, said first fixing groove being coupled to an upper end of said upper spring;
a second fixing groove is formed at a lower portion of said upper-opened magnetic sensor part, said second fixing groove being coupled to a lower end of said bottom spring; and
said magnetic sensor part being filled therein with a liquid to damp a vibration when the vibration is generated during vertical movement of said magnetic sensor;
a spring stopper, attached at both lateral sides of said magnetic sensor, to prevent said upper spring and said bottom spring from rotating; and
said upper spring and said bottom spring being fitted into upper and bottom sides of said magnetic sensor up to both distal ends of said spring stopper; and
said spring stopper including a groove to fix said upper spring and said bottom spring;
said lid including, at a center thereof, a through hole to pass a magnetic sensor cable therethrough;
said liquid filling said magnetic sensor part having a same specific gravity as said magnetic sensor to enable said magnetic sensor to neutralize buoyance inside said liquid;
said lid being screw-connected with said magnetic sensor part;
said magnetic sensor including an upper lid and a bottom lid, said upper lid covering an opened upper side of said upper/bottom-opened pipe-shaped housing, said bottom lid covering an opened side of said upper/bottom-opened pipe-shaped housing.