JPS6267484A - Method and apparatus for selectively detecting metal - Google Patents

Method and apparatus for selectively detecting metal

Info

Publication number
JPS6267484A
JPS6267484A JP60206695A JP20669585A JPS6267484A JP S6267484 A JPS6267484 A JP S6267484A JP 60206695 A JP60206695 A JP 60206695A JP 20669585 A JP20669585 A JP 20669585A JP S6267484 A JPS6267484 A JP S6267484A
Authority
JP
Japan
Prior art keywords
metal
harmonic
magnetic field
ac
detect
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.)
Pending
Application number
JP60206695A
Inventor
Hiroshi Miyashiro
Hitoshi Takaku
Original Assignee
Asano Yukihiko
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 Asano Yukihiko filed Critical Asano Yukihiko
Priority to JP60206695A priority Critical patent/JPS6267484A/en
Publication of JPS6267484A publication Critical patent/JPS6267484A/en
Application status is Pending legal-status Critical

Links

Abstract

PURPOSE: To detect a specified metal with a lessened intensity of an AC bias magnetic field, by exiting a metal to be detected in an AC magnetic field with a required frequency to detect a harmonic distortion component intrinsic to metal based on a harmonic component integrally multiplying the AC magnetic field.
CONSTITUTION: Magnetic field generating coils 3 and 4 outputs a sine wave of about 3W5KHz with an AC power source 7 to excite metal attached to an article passing through a detection zone. The metal is mounted to a price tag sheet and generates a harmonic component proper to the metal. This component is detected with detection coils 5 and 6 to be converted into an AC signal and the harmonic component alone is inputted into a synchronous amplifier 9 with a high-pass filter 8 to amplify an Norder harmonic alone according to a frequency output N fold as much as a fundamental wave from a PLL circuit 10. The N-order harmonic signal is converted into a DC level signal with a low-pass filter 11 and compared with a reference value by a DC comparator 12 to detect a specific metal.
COPYRIGHT: (C)1987,JPO&Japio
JP60206695A 1985-09-20 1985-09-20 Method and apparatus for selectively detecting metal Pending JPS6267484A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60206695A JPS6267484A (en) 1985-09-20 1985-09-20 Method and apparatus for selectively detecting metal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60206695A JPS6267484A (en) 1985-09-20 1985-09-20 Method and apparatus for selectively detecting metal

Publications (1)

Publication Number Publication Date
JPS6267484A true JPS6267484A (en) 1987-03-27

Family

ID=16527582

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60206695A Pending JPS6267484A (en) 1985-09-20 1985-09-20 Method and apparatus for selectively detecting metal

Country Status (1)

Country Link
JP (1) JPS6267484A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5004726A (en) * 1989-07-14 1991-04-02 North American Philips Corp. Apparatus and methodology for the non-contact testing of materials for superconductivity by detecting odd harmonics above a threshold
JPH03279888A (en) * 1990-03-29 1991-12-11 Anritsu Corp Metal detector
JPH06339501A (en) * 1992-04-08 1994-12-13 Jiyuichikai:Kk Vision restoration apparatus
US6737617B1 (en) * 2000-01-24 2004-05-18 General Electric Company Methods and apparatus for a signal distortion based detection system
KR100650628B1 (en) 2005-10-18 2006-11-21 (주)세바시큐리티 Operating method of gun detecting system
KR100650630B1 (en) 2005-10-18 2006-11-21 (주)세바시큐리티 Method for detecting gun of gun detecting system
JP2010156643A (en) * 2008-12-31 2010-07-15 Wellpine Communications Co Ltd Apparatus for detecting sneaked metal matter
JP2015049224A (en) * 2013-09-04 2015-03-16 敏夫 伊東 Electromagnetic induction type inspection device and electromagnetic induction type inspection method
JP2016217947A (en) * 2015-05-22 2016-12-22 アンリツインフィビス株式会社 Metal detection machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5348499A (en) * 1976-08-18 1978-05-01 Knogo Corp Method and device detecting existence of article in searching area
JPS554588A (en) * 1978-05-19 1980-01-14 Philips Nv Detector

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5348499A (en) * 1976-08-18 1978-05-01 Knogo Corp Method and device detecting existence of article in searching area
JPS554588A (en) * 1978-05-19 1980-01-14 Philips Nv Detector

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5004726A (en) * 1989-07-14 1991-04-02 North American Philips Corp. Apparatus and methodology for the non-contact testing of materials for superconductivity by detecting odd harmonics above a threshold
JPH03279888A (en) * 1990-03-29 1991-12-11 Anritsu Corp Metal detector
JPH06339501A (en) * 1992-04-08 1994-12-13 Jiyuichikai:Kk Vision restoration apparatus
US6737617B1 (en) * 2000-01-24 2004-05-18 General Electric Company Methods and apparatus for a signal distortion based detection system
KR100650628B1 (en) 2005-10-18 2006-11-21 (주)세바시큐리티 Operating method of gun detecting system
KR100650630B1 (en) 2005-10-18 2006-11-21 (주)세바시큐리티 Method for detecting gun of gun detecting system
JP2010156643A (en) * 2008-12-31 2010-07-15 Wellpine Communications Co Ltd Apparatus for detecting sneaked metal matter
JP2015049224A (en) * 2013-09-04 2015-03-16 敏夫 伊東 Electromagnetic induction type inspection device and electromagnetic induction type inspection method
JP2016217947A (en) * 2015-05-22 2016-12-22 アンリツインフィビス株式会社 Metal detection machine

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