SE7404978L - DETECTOR DEVICE. - Google Patents

DETECTOR DEVICE.

Info

Publication number
SE7404978L
SE7404978L SE7404978A SE7404978A SE7404978L SE 7404978 L SE7404978 L SE 7404978L SE 7404978 A SE7404978 A SE 7404978A SE 7404978 A SE7404978 A SE 7404978A SE 7404978 L SE7404978 L SE 7404978L
Authority
SE
Sweden
Prior art keywords
detector
period
april
periods
analyzed
Prior art date
Application number
SE7404978A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE381107B (en
Inventor
P Drakenberg
F Lofgren
Original Assignee
Asea 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 Asea Ab filed Critical Asea Ab
Priority to SE7404978A priority Critical patent/SE381107B/en
Priority to DE19752514135 priority patent/DE2514135A1/en
Priority to NO751202A priority patent/NO751202L/no
Priority to GB14734/75A priority patent/GB1498847A/en
Publication of SE7404978L publication Critical patent/SE7404978L/en
Publication of SE381107B publication Critical patent/SE381107B/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
    • G01N27/9046—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents by analysing electrical signals
    • 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

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Remote Sensing (AREA)
  • Environmental & Geological Engineering (AREA)
  • Biochemistry (AREA)
  • Geology (AREA)
  • Geophysics (AREA)
  • Electromagnetism (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Control Of Conveyors (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

1498847 Detecting metal objects ASEA AB 10 April 1975 [11 April 1974] 14734/75 Heading G1N In a presence detector output signals are analyzed to determine whether or not they are produced by an object to be detected. In a metal detector a conveyer conveys material at a known speed past a detector in the form of magnetizing and detector coils arranged above and below or at the side of the conveyer the output signal, Fig. 2 is analyzed to ascertain whether it is a true signal formed by the presence of a metal object in the material or a false signal. This is achieved by determining the periods Tl and T3 during which the positive and negative pulses exceed the threshold levels V 1 , V 2 and the period T2. If the period T2 is less than a predetermined period and the periods Tl and T3 exceed respective predetermined times the presence of an object is indicated.
SE7404978A 1974-04-11 1974-04-11 DEVICE FOR LIMITING THE IMPACT OF NON-INNERABLE AMOUNTS IN EQUIPMENT FOR DETECTING THE NERVARON OF SPECIAL FOREMALS, WHICH MOVE AT KNOWN SPEED ACCORDING TO A PARTICULAR PATH SE381107B (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
SE7404978A SE381107B (en) 1974-04-11 1974-04-11 DEVICE FOR LIMITING THE IMPACT OF NON-INNERABLE AMOUNTS IN EQUIPMENT FOR DETECTING THE NERVARON OF SPECIAL FOREMALS, WHICH MOVE AT KNOWN SPEED ACCORDING TO A PARTICULAR PATH
DE19752514135 DE2514135A1 (en) 1974-04-11 1975-03-29 ARRANGEMENT TO REDUCE THE INFLUENCES OF INTERFERENCE IN MEASURING EQUIPMENT FOR THE DISPLAY OF CERTAIN OBJECTS
NO751202A NO751202L (en) 1974-04-11 1975-04-08
GB14734/75A GB1498847A (en) 1974-04-11 1975-04-10 Metal detector method and device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7404978A SE381107B (en) 1974-04-11 1974-04-11 DEVICE FOR LIMITING THE IMPACT OF NON-INNERABLE AMOUNTS IN EQUIPMENT FOR DETECTING THE NERVARON OF SPECIAL FOREMALS, WHICH MOVE AT KNOWN SPEED ACCORDING TO A PARTICULAR PATH

Publications (2)

Publication Number Publication Date
SE7404978L true SE7404978L (en) 1975-10-13
SE381107B SE381107B (en) 1975-11-24

Family

ID=20320817

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7404978A SE381107B (en) 1974-04-11 1974-04-11 DEVICE FOR LIMITING THE IMPACT OF NON-INNERABLE AMOUNTS IN EQUIPMENT FOR DETECTING THE NERVARON OF SPECIAL FOREMALS, WHICH MOVE AT KNOWN SPEED ACCORDING TO A PARTICULAR PATH

Country Status (4)

Country Link
DE (1) DE2514135A1 (en)
GB (1) GB1498847A (en)
NO (1) NO751202L (en)
SE (1) SE381107B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4193028A (en) * 1978-05-05 1980-03-11 Honeywell Inc. Eddy current instrumentation circuitry for distinguishing flaw signals from spurious noise signals
DE3448564C2 (en) * 1984-10-05 1997-04-24 Truetzschler Gmbh & Co Kg Fibre bale scanner

Also Published As

Publication number Publication date
GB1498847A (en) 1978-01-25
DE2514135A1 (en) 1975-10-23
SE381107B (en) 1975-11-24
NO751202L (en) 1975-10-14

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