GB526805A - Improvements in and relating to devices for detecting magnetic metal - Google Patents

Improvements in and relating to devices for detecting magnetic metal

Info

Publication number
GB526805A
GB526805A GB163439A GB163439A GB526805A GB 526805 A GB526805 A GB 526805A GB 163439 A GB163439 A GB 163439A GB 163439 A GB163439 A GB 163439A GB 526805 A GB526805 A GB 526805A
Authority
GB
United Kingdom
Prior art keywords
magnetic metal
vehicles
coils
signal
devices
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.)
Expired
Application number
GB163439A
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Priority to GB163439A priority Critical patent/GB526805A/en
Publication of GB526805A publication Critical patent/GB526805A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/042—Detecting movement of traffic to be counted or controlled using inductive or magnetic detectors

Landscapes

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

Abstract

526,805. Locating foreign bodies. FRANCIS, E. L. (Illinois Testing Laboratories, Inc.). Jan. 17, 1939, No. 1634. Drawings to Specification. [Class 81 (ii)] [Also in Groups XXXVI, XVIII, XX and XXXVIII] The presence of magnetic metal articles e.g. pistols or knives on a person passing through a doorway, vehicles passing traffic signal points, metallic particles in foodstuffs, or in the human body, is detected by moving the object or person under test relative to the field of a permanent magnet, whereby any metal present induces an e.m.f. in a pair of similar coils embracing the magnet to operate a visual, or audible signal, if desired, through an amplifier. The coils are connected in opposition to prevent operation of the signal by extraneous magnetic effects. In the detection of armed intruders, the device may be combined with means for taking photographs. Devices responsive to passage of vehicles may show up advertising signs.
GB163439A 1939-01-17 1939-01-17 Improvements in and relating to devices for detecting magnetic metal Expired GB526805A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB163439A GB526805A (en) 1939-01-17 1939-01-17 Improvements in and relating to devices for detecting magnetic metal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB163439A GB526805A (en) 1939-01-17 1939-01-17 Improvements in and relating to devices for detecting magnetic metal

Publications (1)

Publication Number Publication Date
GB526805A true GB526805A (en) 1940-09-26

Family

ID=9725329

Family Applications (1)

Application Number Title Priority Date Filing Date
GB163439A Expired GB526805A (en) 1939-01-17 1939-01-17 Improvements in and relating to devices for detecting magnetic metal

Country Status (1)

Country Link
GB (1) GB526805A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2760182A (en) * 1951-02-20 1956-08-21 British Telecomm Res Ltd Apparatus for detecting the movement of objects of magnetic material
FR2503382A1 (en) * 1981-04-02 1982-10-08 Sperry Corp IMPROVED METAL DETECTOR
GB2126348A (en) * 1982-07-08 1984-03-21 Duerrwaechter E Dr Doduco Magnetic sensor
EP0432180A1 (en) * 1988-08-12 1991-06-19 Dorian Ind Pty Ltd Timing apparatus.
WO2004055490A1 (en) * 2002-12-18 2004-07-01 Security Control S.R.L. Magnetic-inductive device for the control of ferromagnetic reticles
WO2007071215A1 (en) * 2005-12-19 2007-06-28 Karl Salzmann Induction unit
ITNA20100006A1 (en) * 2010-02-12 2011-08-13 Voluzione Di F M Sacerdoti Srl SAFETY SYSTEM TO REPORT THE PASSAGE OF AN INDUSTRIAL TRANSPORT THROUGH A VARCO
CN113189655A (en) * 2021-04-30 2021-07-30 上海领先仪器有限公司 High anti-interference multichannel metal detection instrument

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2760182A (en) * 1951-02-20 1956-08-21 British Telecomm Res Ltd Apparatus for detecting the movement of objects of magnetic material
FR2503382A1 (en) * 1981-04-02 1982-10-08 Sperry Corp IMPROVED METAL DETECTOR
GB2126348A (en) * 1982-07-08 1984-03-21 Duerrwaechter E Dr Doduco Magnetic sensor
EP0432180A1 (en) * 1988-08-12 1991-06-19 Dorian Ind Pty Ltd Timing apparatus.
EP0432180A4 (en) * 1988-08-12 1992-01-02 Dorian Industries Pty. Ltd. Timing apparatus
WO2004055490A1 (en) * 2002-12-18 2004-07-01 Security Control S.R.L. Magnetic-inductive device for the control of ferromagnetic reticles
US7098656B2 (en) 2002-12-18 2006-08-29 Security Control S.R.L. Magnetic-inductive device for the control of ferromagnetic reticles
WO2007071215A1 (en) * 2005-12-19 2007-06-28 Karl Salzmann Induction unit
ITNA20100006A1 (en) * 2010-02-12 2011-08-13 Voluzione Di F M Sacerdoti Srl SAFETY SYSTEM TO REPORT THE PASSAGE OF AN INDUSTRIAL TRANSPORT THROUGH A VARCO
CN113189655A (en) * 2021-04-30 2021-07-30 上海领先仪器有限公司 High anti-interference multichannel metal detection instrument

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