JPS57187649A - Metal detector - Google Patents

Metal detector

Info

Publication number
JPS57187649A
JPS57187649A JP56072715A JP7271581A JPS57187649A JP S57187649 A JPS57187649 A JP S57187649A JP 56072715 A JP56072715 A JP 56072715A JP 7271581 A JP7271581 A JP 7271581A JP S57187649 A JPS57187649 A JP S57187649A
Authority
JP
Japan
Prior art keywords
metal
detection
turns
coils
highly sensitive
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.)
Granted
Application number
JP56072715A
Other languages
Japanese (ja)
Other versions
JPS637633B2 (en
Inventor
Masahiro Tarui
Yasumoto Suzuki
Kiyohiko Ehana
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.)
Anritsu Corp
Original Assignee
Anritsu Corp
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 Anritsu Corp filed Critical Anritsu Corp
Priority to JP56072715A priority Critical patent/JPS57187649A/en
Publication of JPS57187649A publication Critical patent/JPS57187649A/en
Publication of JPS637633B2 publication Critical patent/JPS637633B2/ja
Granted 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
    • 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
    • G01V3/107—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 using compensating coil or loop arrangements

Abstract

PURPOSE:To achieve a highly sensitive detection by properly changing over the number of turns of first and second receiving coils arranged in a magnetic field generated thereby with a selection switch in a detector for metal mingled into a test object. CONSTITUTION:The oscillation frequency of an oscillator 1 is divided with a divider 2, converted into a sine wave with a voltage amplifier 3 and supplied to a transmission coil P at a detection coil section 4. A balance circuit 5 produces an unbalanced output only when metal exists in a test object passing between the transmission coil P and receiving coils S1 and S2 thereby permitting the detection of the mingling of metal with a detection circuit 10. The coils P and S1 and S2 are so arranged to select the number of turns with selector switches 41-43 according to material of test objects and metal to be detected and the number of turns of the coils P and S1 and S2 is changed over according to frequecy, a highly sensitive detection can be done.
JP56072715A 1981-05-13 1981-05-13 Metal detector Granted JPS57187649A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56072715A JPS57187649A (en) 1981-05-13 1981-05-13 Metal detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56072715A JPS57187649A (en) 1981-05-13 1981-05-13 Metal detector

Publications (2)

Publication Number Publication Date
JPS57187649A true JPS57187649A (en) 1982-11-18
JPS637633B2 JPS637633B2 (en) 1988-02-17

Family

ID=13497319

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56072715A Granted JPS57187649A (en) 1981-05-13 1981-05-13 Metal detector

Country Status (1)

Country Link
JP (1) JPS57187649A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8278918B2 (en) 2010-10-07 2012-10-02 Mettler-Toledo Safeline Limited Method for operating of a metal detection system and metal detection system
US8314713B2 (en) 2010-10-07 2012-11-20 Mettler-Toledo Safeline Limited Method for monitoring the operation of a metal detection system and metal detection system
US8587301B2 (en) 2010-10-07 2013-11-19 Mettler-Toledo Safeline Limited Method for operating a metal detection system and metal detection system
US9018935B2 (en) 2011-09-19 2015-04-28 Mettler-Toledo Safeline Limited Method for operating a metal detection apparatus and apparatus
DE102004047188B4 (en) 2004-09-29 2022-10-27 Robert Bosch Gmbh Device for locating metallic objects

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004047188B4 (en) 2004-09-29 2022-10-27 Robert Bosch Gmbh Device for locating metallic objects
US8278918B2 (en) 2010-10-07 2012-10-02 Mettler-Toledo Safeline Limited Method for operating of a metal detection system and metal detection system
US8314713B2 (en) 2010-10-07 2012-11-20 Mettler-Toledo Safeline Limited Method for monitoring the operation of a metal detection system and metal detection system
US8587301B2 (en) 2010-10-07 2013-11-19 Mettler-Toledo Safeline Limited Method for operating a metal detection system and metal detection system
US9018935B2 (en) 2011-09-19 2015-04-28 Mettler-Toledo Safeline Limited Method for operating a metal detection apparatus and apparatus

Also Published As

Publication number Publication date
JPS637633B2 (en) 1988-02-17

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