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SE8102827L - DEVICE FOR THE DETECTION OF METAL FORMS - Google Patents

DEVICE FOR THE DETECTION OF METAL FORMS

Info

Publication number
SE8102827L
SE8102827L SE8102827A SE8102827A SE8102827L SE 8102827 L SE8102827 L SE 8102827L SE 8102827 A SE8102827 A SE 8102827A SE 8102827 A SE8102827 A SE 8102827A SE 8102827 L SE8102827 L SE 8102827L
Authority
SE
Sweden
Prior art keywords
signal
coil
transmitter coil
uref
rectified
Prior art date
Application number
SE8102827A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE426269B (en
Inventor
K-E Moberg
Original Assignee
Bofors Ab
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 Bofors Ab filed Critical Bofors Ab
Priority to SE8102827A priority Critical patent/SE426269B/en
Priority to GB8211642A priority patent/GB2097933B/en
Priority to NL8201811A priority patent/NL8201811A/en
Priority to JP57075053A priority patent/JPS57192887A/en
Priority to IT48333/82A priority patent/IT1147941B/en
Priority to FR8207818A priority patent/FR2505508B1/en
Priority to CA000402340A priority patent/CA1198165A/en
Priority to NO821485A priority patent/NO821485L/en
Priority to CH2774/82A priority patent/CH656231A5/en
Priority to DE19823217033 priority patent/DE3217033A1/en
Priority to BE0/208015A priority patent/BE893088A/en
Publication of SE8102827L publication Critical patent/SE8102827L/en
Publication of SE426269B publication Critical patent/SE426269B/en

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
    • 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
    • G01V3/104—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 using several coupled or uncoupled coils
    • G01V3/105—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 using several coupled or uncoupled coils forming directly coupled primary and secondary coils or loops

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Remote Sensing (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Electromagnetism (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Control Of Vending Devices And Auxiliary Devices For Vending Devices (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)

Abstract

Means for detecting a metallic object comprises a coil system with a transmitter coil (5) for generating an electromagnetic field and a receiver coil (6) subject to an electromotive force induced by the resultant of the field generated by a metallic object and the field generated directly by the transmitter coil (5). An oscillator (1) is provided for generating a sinusoidal signal for the transmitter coil (5) and a variable attenuation or amplification circuit (2) is provided for controlling the amplitude of the signal, this circuit (2) being controlled by a signal (Im) emitted by the coil system and then rectified (8) and compared (9) with a reference voltage (Uref), the arrangement being such as to control the amplitude of said electromagnetic field. In an alternative embodiment (Figure 2) the signal emitted by the transmitter coil itself is rectified and compared with Uref. The detection means may be used in an electromagnetic proximity fuze. <IMAGE>
SE8102827A 1981-05-06 1981-05-06 DEVICE FOR THE DETECTION OF METAL FORMS SE426269B (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
SE8102827A SE426269B (en) 1981-05-06 1981-05-06 DEVICE FOR THE DETECTION OF METAL FORMS
GB8211642A GB2097933B (en) 1981-05-06 1982-04-22 Means for detecting a metallic object
NL8201811A NL8201811A (en) 1981-05-06 1982-05-03 SYSTEM FOR DETECTING METAL ARTICLES.
JP57075053A JPS57192887A (en) 1981-05-06 1982-05-04 Detector for metallic body
IT48333/82A IT1147941B (en) 1981-05-06 1982-05-05 ELECTROMAGNETIC DETECTION DEVICE FOR METALLIC OBJECTS
FR8207818A FR2505508B1 (en) 1981-05-06 1982-05-05 METAL OBJECT DETECTION DEVICE
CA000402340A CA1198165A (en) 1981-05-06 1982-05-05 Means for metallic object detection
NO821485A NO821485L (en) 1981-05-06 1982-05-05 DEVICE FOR THE DETECTION OF METAL GOODS.
CH2774/82A CH656231A5 (en) 1981-05-06 1982-05-05 DEVICE FOR DETECTING METAL OBJECTS.
DE19823217033 DE3217033A1 (en) 1981-05-06 1982-05-06 DETECTOR DEVICE FOR METALLIC OBJECTS
BE0/208015A BE893088A (en) 1981-05-06 1982-05-06 DEVICE FOR THE DETECTION OF METAL OBJECTS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8102827A SE426269B (en) 1981-05-06 1981-05-06 DEVICE FOR THE DETECTION OF METAL FORMS

Publications (2)

Publication Number Publication Date
SE8102827L true SE8102827L (en) 1982-11-07
SE426269B SE426269B (en) 1982-12-20

Family

ID=20343740

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8102827A SE426269B (en) 1981-05-06 1981-05-06 DEVICE FOR THE DETECTION OF METAL FORMS

Country Status (11)

Country Link
JP (1) JPS57192887A (en)
BE (1) BE893088A (en)
CA (1) CA1198165A (en)
CH (1) CH656231A5 (en)
DE (1) DE3217033A1 (en)
FR (1) FR2505508B1 (en)
GB (1) GB2097933B (en)
IT (1) IT1147941B (en)
NL (1) NL8201811A (en)
NO (1) NO821485L (en)
SE (1) SE426269B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59141001A (en) * 1983-02-01 1984-08-13 Mitsubishi Electric Corp Detecting method for effective end position of metallic pipe
SE9203256L (en) * 1992-11-04 1994-01-10 Bofors Ab Magnetic zone tube
US5426363A (en) * 1993-04-26 1995-06-20 Kabushiki Kaisha Honda Denshi Giken Object detecting device
WO2009155668A1 (en) * 2008-06-27 2009-12-30 Minelab Electronics Pty Limited Constant current metal detector with driven transmit coil

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB835128A (en) * 1955-09-17 1960-05-18 Asea Ab Apparatus for examining a substance utilising the effect of the substance on the q factor of a resonant circuit
DE2052989C3 (en) * 1970-10-30 1973-11-08 Guenther Dipl.-Ing. 2209 Sushoern Weber Switching device triggered by one or more moving objects
GB1448877A (en) * 1973-09-04 1976-09-08 Weber G Electronic switching device for sensing a body and for converting such sensing into an electrical signal
GB1561641A (en) * 1976-08-05 1980-02-27 Redland Automation Ltd Presence detector apparatus
LU75628A1 (en) * 1976-08-19 1978-04-13
DE2722498C3 (en) * 1977-05-18 1982-02-04 Walter Ing.(Grad.) 8728 Hassfurt Voll Device on a motor vehicle for displaying a minimum distance
DE2722511A1 (en) * 1977-05-18 1978-11-30 Voll Walter METAL DETECTOR

Also Published As

Publication number Publication date
FR2505508B1 (en) 1985-11-29
NL8201811A (en) 1982-12-01
CA1198165A (en) 1985-12-17
GB2097933B (en) 1985-05-15
DE3217033A1 (en) 1982-11-25
GB2097933A (en) 1982-11-10
DE3217033C2 (en) 1991-01-03
JPS57192887A (en) 1982-11-27
BE893088A (en) 1982-08-30
IT8248333A0 (en) 1982-05-05
FR2505508A1 (en) 1982-11-12
IT1147941B (en) 1986-11-26
NO821485L (en) 1982-11-08
SE426269B (en) 1982-12-20
CH656231A5 (en) 1986-06-13

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