SE440832B - Utrustning och metod for att identifiera foremal med elektriskt ledande egenskaper - Google Patents

Utrustning och metod for att identifiera foremal med elektriskt ledande egenskaper

Info

Publication number
SE440832B
SE440832B SE7904329A SE7904329A SE440832B SE 440832 B SE440832 B SE 440832B SE 7904329 A SE7904329 A SE 7904329A SE 7904329 A SE7904329 A SE 7904329A SE 440832 B SE440832 B SE 440832B
Authority
SE
Sweden
Prior art keywords
coil
frequency
resistive component
values
coil system
Prior art date
Application number
SE7904329A
Other languages
English (en)
Swedish (sv)
Other versions
SE7904329L (sv
Inventor
W D Gregory
L H Capots
Original Assignee
Univ Georgetown
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 Univ Georgetown filed Critical Univ Georgetown
Publication of SE7904329L publication Critical patent/SE7904329L/
Publication of SE440832B publication Critical patent/SE440832B/sv

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/26—Electrical actuation by proximity of an intruder causing variation in capacitance or inductance of a circuit
    • 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
    • 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

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Remote Sensing (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Immunology (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • Electrochemistry (AREA)
  • Biochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
SE7904329A 1978-08-25 1979-05-17 Utrustning och metod for att identifiera foremal med elektriskt ledande egenskaper SE440832B (sv)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782837265 DE2837265C2 (de) 1978-08-25 1978-08-25 Verfahren zur Identifizierung von Objekten mit leitenden Eigenschaften und Schaltungsanordnung zur Durchführung dieses Verfahrens

Publications (2)

Publication Number Publication Date
SE7904329L SE7904329L (sv) 1980-11-18
SE440832B true SE440832B (sv) 1985-08-19

Family

ID=6047949

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7904329A SE440832B (sv) 1978-08-25 1979-05-17 Utrustning och metod for att identifiera foremal med elektriskt ledande egenskaper

Country Status (7)

Country Link
CA (1) CA1157096A (zh)
CH (1) CH660799A5 (zh)
DE (1) DE2837265C2 (zh)
FR (1) FR2456951A1 (zh)
GB (1) GB1603578A (zh)
NL (1) NL7903965A (zh)
SE (1) SE440832B (zh)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3228447C2 (de) * 1982-07-30 1986-04-10 Vallon GmbH, 7412 Eningen Meßverfahren zur Erkennung von metallischen Gegenständen und Metalldetektor zur Durchführung des Verfahrens
FR2545221B1 (fr) * 1983-04-29 1985-12-13 Thomson Jeumont Cables Capteur de donnees, par courant de foucault, et ensemble de controle de resistivite muni d'un tel capteur
GB2140564B (en) * 1983-05-23 1986-10-22 Central Electr Generat Board Cable corrosion monitor
DE3674675D1 (de) * 1985-02-15 1990-11-08 Broken Hill Pty Co Ltd Klassifizierung von stahl.
DE3713363A1 (de) * 1987-04-21 1988-11-10 Friedrich Prof Dr Foerster Suchgeraet zum suchen von metallteilen
CN1049287A (zh) * 1989-05-24 1991-02-20 住友电气工业株式会社 治疗导管
GB8920412D0 (en) * 1989-09-08 1989-10-25 Ca Atomic Energy Ltd Metal detecting system
DE19521266C1 (de) * 1995-06-10 1997-02-13 Mesutronic Geraetebau Gmbh Einrichtung zur Feststellung metallisch leitender Teile
US6359582B1 (en) * 1996-09-18 2002-03-19 The Macaleese Companies, Inc. Concealed weapons detection system
US7450052B2 (en) 1999-05-25 2008-11-11 The Macaleese Companies, Inc. Object detection method and apparatus
US7167123B2 (en) 1999-05-25 2007-01-23 Safe Zone Systems, Inc. Object detection method and apparatus
DE19954716B4 (de) * 1999-11-13 2006-08-31 Mesutronic Gerätebau GmbH Funktionsprüfung für einen Metalldetektor
DE10309132A1 (de) * 2003-02-28 2004-11-18 Forschungszentrum Jülich GmbH Verfahren und Vorrichtung zum selektiven Nachweis magnetischer Partikel
US7976518B2 (en) 2005-01-13 2011-07-12 Corpak Medsystems, Inc. Tubing assembly and signal generator placement control device and method for use with catheter guidance systems
CN103180760B (zh) 2010-10-07 2016-10-26 梅特勒-托利多安全线有限公司 用于操作金属探测系统的方法以及金属探测系统
EP2439560B1 (en) 2010-10-07 2013-05-29 Mettler-Toledo Safeline Limited Method for monitoring the operation of a metal detection system and metal detection system
EP2439559B1 (en) 2010-10-07 2013-05-29 Mettler-Toledo Safeline Limited Method for operating of a metal detection system and metal detection system
US9028441B2 (en) 2011-09-08 2015-05-12 Corpak Medsystems, Inc. Apparatus and method used with guidance system for feeding and suctioning
US9018935B2 (en) 2011-09-19 2015-04-28 Mettler-Toledo Safeline Limited Method for operating a metal detection apparatus and apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3676772A (en) * 1970-08-18 1972-07-11 Nasa Metallic intrusion detector system
US3686564A (en) * 1970-10-08 1972-08-22 Westinghouse Electric Corp Multiple frequency magnetic field technique for differentiating between classes of metal objects
GB1482976A (en) * 1975-06-09 1977-08-17 Spencer P Metal detectors

Also Published As

Publication number Publication date
NL7903965A (nl) 1980-11-25
CA1157096A (en) 1983-11-15
FR2456951B1 (zh) 1985-04-19
SE7904329L (sv) 1980-11-18
FR2456951A1 (fr) 1980-12-12
DE2837265A1 (de) 1980-03-06
GB1603578A (en) 1981-11-25
CH660799A5 (en) 1987-06-15
DE2837265C2 (de) 1987-02-05

Similar Documents

Publication Publication Date Title
SE440832B (sv) Utrustning och metod for att identifiera foremal med elektriskt ledande egenskaper
US4263551A (en) Method and apparatus for identifying conductive objects by monitoring the true resistive component of impedance change in a coil system caused by the object
US5541510A (en) Multi-Parameter eddy current measuring system with parameter compensation technical field
US3686564A (en) Multiple frequency magnetic field technique for differentiating between classes of metal objects
US4134067A (en) Rotary eddy current flaw detector utilizing differentially unbalanced coils and the amplitude of a rotary induced pulse to produce the charging voltage for the sweep generator
KR100218653B1 (ko) 전자유도형 검사장치
US6201391B1 (en) Nonlinear harmonics method and system for measuring degradation in protective coatings
EP0143825B1 (en) Method and apparatus for testing using a plurality of frequencies
Rehim et al. Measurement system for determining the magnetic polarizability tensor of small metal targets
EP0685078B1 (en) Location of buried conductors
JPS60152950A (ja) 渦電流非破壊試験方法およびその装置
EP0001919A1 (en) Identification of materials using their complex dielectric response
US3619771A (en) Method of an apparatus for selecting the optimum test frequency in eddy current testing
US4644336A (en) Color display of related parameters
US4078201A (en) Oscillator circuit for generating a signal whose frequency is representative of the phase shift of a four terminal network
US4237419A (en) Method and apparatus for non-destructive testing using a plurality of frequencies
Vinogradova et al. Selection of method and means of measuring resonant frequency of serial oscillatory circuit
US3166710A (en) Apparatus having segmented pickup coil and output circuit means responsive to signals from a single coil segment
CA1254265A (en) Lift-off compensation of eddy current probes
US3249869A (en) Apparatus for measuring the electrical properties of a conductive moving fluid
US3701941A (en) Magnetic anomaly detector with means for obtaining different test frequencies
US4054832A (en) System and method of measurement of insulation qualities of three-phase power equipment
SU746278A1 (ru) Способ неразрушающего контрол и устройство дл его реализации
RU2090882C1 (ru) Вихретоковый дефектоскоп для контроля цилиндрических изделий
EP0603340B1 (en) Method and apparatus for testing coins

Legal Events

Date Code Title Description
NUG Patent has lapsed

Ref document number: 7904329-5

Effective date: 19911209

Format of ref document f/p: F