GB526805A - Improvements in and relating to devices for detecting magnetic metal - Google Patents
Improvements in and relating to devices for detecting magnetic metalInfo
- 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
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)
- Burglar Alarm Systems (AREA)
- Geophysics And Detection Of Objects (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.
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)
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 |
-
1939
- 1939-01-17 GB GB163439A patent/GB526805A/en not_active Expired
Cited By (10)
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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