JPS57187650A - Metal detector - Google Patents

Metal detector

Info

Publication number
JPS57187650A
JPS57187650A JP56072716A JP7271681A JPS57187650A JP S57187650 A JPS57187650 A JP S57187650A JP 56072716 A JP56072716 A JP 56072716A JP 7271681 A JP7271681 A JP 7271681A JP S57187650 A JPS57187650 A JP S57187650A
Authority
JP
Japan
Prior art keywords
divider
frequencies
metal
oscillator
test object
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
JP56072716A
Other languages
Japanese (ja)
Other versions
JPS637634B2 (en
Inventor
Masahiro Tarui
Yasumoto Suzuki
Toshiharu Tanaka
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 JP56072716A priority Critical patent/JPS57187650A/en
Publication of JPS57187650A publication Critical patent/JPS57187650A/en
Publication of JPS637634B2 publication Critical patent/JPS637634B2/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 providing a divider adapted to select any one of a plurality of demultiply frequencies with a selector switch between an oscillator and a transmission coil in a detector of metal mixed into a test object. CONSTITUTION:Oscillation frequencies of an oscillator 1 is divided with a divider 2 and converted with a voltage amplifier 3 into a sine wave, which is fed to a transmission coil P of a detection ciol section 4. An unbalanced output is produced from a balance circuit 5 only when metal exists in a test object passing between the transmission coil P and receiving coils S1 and S2 and the mixing of the metal is detected by a detection circuit 10. The divider 2 is so arranged that for example, three kinds of frequencies can be selected with a selector switch 21. The oscillation frequency of the oscillator 1 is divided with a 1/4 divider 22, a 1/3 divider 23 and a 1/2 divider 24 and connected to terminals a-c of the switch 21. The 1/2 divider 24 is provided at the final stage of the divider 2. This enable the selection of frequencies according to the test object and the type of metal to be detected.
JP56072716A 1981-05-13 1981-05-13 Metal detector Granted JPS57187650A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56072716A JPS57187650A (en) 1981-05-13 1981-05-13 Metal detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56072716A JPS57187650A (en) 1981-05-13 1981-05-13 Metal detector

Publications (2)

Publication Number Publication Date
JPS57187650A true JPS57187650A (en) 1982-11-18
JPS637634B2 JPS637634B2 (en) 1988-02-17

Family

ID=13497347

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56072716A Granted JPS57187650A (en) 1981-05-13 1981-05-13 Metal detector

Country Status (1)

Country Link
JP (1) JPS57187650A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6249283A (en) * 1985-08-28 1987-03-03 Nec Corp Ferrite proximity sensor
JPS6269184A (en) * 1985-09-17 1987-03-30 アイデンティテック・コ−ポレ−ション Induction field type article monitor system
US4975646A (en) * 1988-01-15 1990-12-04 Llamas Llamas Francisco J Detector system for recognizing a magnetic material
WO2006034900A1 (en) * 2004-09-29 2006-04-06 Robert Bosch Gmbh Device for locating metallic objects and method for adjusting such a device
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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0734742U (en) * 1993-12-16 1995-06-27 サッポロビール株式会社 Racks and rack units for bottled beverages

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6249283A (en) * 1985-08-28 1987-03-03 Nec Corp Ferrite proximity sensor
JPS6269184A (en) * 1985-09-17 1987-03-30 アイデンティテック・コ−ポレ−ション Induction field type article monitor system
US4975646A (en) * 1988-01-15 1990-12-04 Llamas Llamas Francisco J Detector system for recognizing a magnetic material
WO2006034900A1 (en) * 2004-09-29 2006-04-06 Robert Bosch Gmbh Device for locating metallic objects and method for adjusting such a device
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
JPS637634B2 (en) 1988-02-17

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