GB2261073A - Metal detector - Google Patents

Metal detector

Info

Publication number
GB2261073A
GB2261073A GB9226634A GB9226634A GB2261073A GB 2261073 A GB2261073 A GB 2261073A GB 9226634 A GB9226634 A GB 9226634A GB 9226634 A GB9226634 A GB 9226634A GB 2261073 A GB2261073 A GB 2261073A
Authority
GB
United Kingdom
Prior art keywords
metal
metal detector
electromagnetic field
primary electromagnetic
opposes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB9226634A
Other versions
GB2261073B (en
GB9226634D0 (en
Inventor
Ivan Beswick
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Safeline Ltd
Original Assignee
Safeline Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB909014496A external-priority patent/GB9014496D0/en
Application filed by Safeline Ltd filed Critical Safeline Ltd
Priority to GB9226634A priority Critical patent/GB2261073B/en
Publication of GB9226634D0 publication Critical patent/GB9226634D0/en
Publication of GB2261073A publication Critical patent/GB2261073A/en
Application granted granted Critical
Publication of GB2261073B publication Critical patent/GB2261073B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/025—Compensating stray fields
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/21—Rotors for wind turbines
    • F05B2240/231—Rotors for wind turbines driven by aerodynamic lift effects

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

A metal detector (50) comprises a coiled conductor (12) located within a metal enclosure (14) operative to provide an a.c. generated primary electromagnetic field. Metal screening (26) is provided adjacent the coil so as to provide a secondary induced magnetic field (34) which opposes the primary electromagnetic field (32) so as to significantly reduce the metal free zone.
GB9226634A 1990-06-29 1992-12-21 Metal detector Expired - Lifetime GB2261073B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9226634A GB2261073B (en) 1990-06-29 1992-12-21 Metal detector

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB909014496A GB9014496D0 (en) 1990-06-29 1990-06-29 Metal detectors
PCT/GB1991/001066 WO1992000534A1 (en) 1990-06-29 1991-07-01 Metal detector
GB9226634A GB2261073B (en) 1990-06-29 1992-12-21 Metal detector

Publications (3)

Publication Number Publication Date
GB9226634D0 GB9226634D0 (en) 1993-03-10
GB2261073A true GB2261073A (en) 1993-05-05
GB2261073B GB2261073B (en) 1994-02-16

Family

ID=26297259

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9226634A Expired - Lifetime GB2261073B (en) 1990-06-29 1992-12-21 Metal detector

Country Status (1)

Country Link
GB (1) GB2261073B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19830584C2 (en) * 1997-10-11 2001-11-22 Mesutronic Geraetebau Gmbh Sensor device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58100768A (en) * 1981-12-11 1983-06-15 Tech Res & Dev Inst Of Japan Def Agency Metal detector
EP0096568A1 (en) * 1982-06-09 1983-12-21 Deere & Company Metal detection system
JPS61133890A (en) * 1984-12-04 1986-06-21 Nec Corp Magnetic sensor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58100768A (en) * 1981-12-11 1983-06-15 Tech Res & Dev Inst Of Japan Def Agency Metal detector
EP0096568A1 (en) * 1982-06-09 1983-12-21 Deere & Company Metal detection system
JPS61133890A (en) * 1984-12-04 1986-06-21 Nec Corp Magnetic sensor

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, vol 10, no. 327 (P-513)[2383] & JP610133890. *
Patent Abstracts of Japan, vol 7, no. 206 (P-222)[1351] & JP580100768. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19830584C2 (en) * 1997-10-11 2001-11-22 Mesutronic Geraetebau Gmbh Sensor device

Also Published As

Publication number Publication date
GB2261073B (en) 1994-02-16
GB9226634D0 (en) 1993-03-10

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Expiry date: 20110630