JPS57198880A - Metal detector - Google Patents

Metal detector

Info

Publication number
JPS57198880A
JPS57198880A JP56083576A JP8357681A JPS57198880A JP S57198880 A JPS57198880 A JP S57198880A JP 56083576 A JP56083576 A JP 56083576A JP 8357681 A JP8357681 A JP 8357681A JP S57198880 A JPS57198880 A JP S57198880A
Authority
JP
Japan
Prior art keywords
signal
chopper
sent
metal
output
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
JP56083576A
Other languages
Japanese (ja)
Other versions
JPS6332157B2 (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 JP56083576A priority Critical patent/JPS57198880A/en
Publication of JPS57198880A publication Critical patent/JPS57198880A/en
Publication of JPS6332157B2 publication Critical patent/JPS6332157B2/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 enable simultaneous detection of ion and non-ferrous metals, by a method wherein, in a metal detector which detects a metal mixed in an object to be tested, an unbalanced signal is chopped by two chopper signals being different in a phase by 90 deg.. CONSTITUTION:An output signal (a) of a rectangular wave of an oscillator 1 is divided into a signal (b) having a desired frequency to supply it to a transmitting coil P of a voltage amplifier 4. An induced volage is generated at 2 receiving coils S1 and S2, and an unbalanced output is produced from a balance circuit 5 only when a metal exists in an object to be tested passing between the coil P and the coils S1, S2. The output of the circuit 5 is amplified (6) and sent to chopprs 7a and 7b and a balance display 8. Chopper signals (c) and (d), having the same frequency as that of an output signal to a voltge amplifier 3, is outputted from said frequency divider 2, the two signals (c) and (d) are 90 deg. different in a phase, and the duty ratios are both 1:1. The signal (c) is sent to the chopper 7a for detecting iron, and the signal (d), whose phase advances by 90 deg., is sent to the chopper 7b for detecting non-ferrous metal.
JP56083576A 1981-05-30 1981-05-30 Metal detector Granted JPS57198880A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56083576A JPS57198880A (en) 1981-05-30 1981-05-30 Metal detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56083576A JPS57198880A (en) 1981-05-30 1981-05-30 Metal detector

Publications (2)

Publication Number Publication Date
JPS57198880A true JPS57198880A (en) 1982-12-06
JPS6332157B2 JPS6332157B2 (en) 1988-06-28

Family

ID=13806324

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56083576A Granted JPS57198880A (en) 1981-05-30 1981-05-30 Metal detector

Country Status (1)

Country Link
JP (1) JPS57198880A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6035285A (en) * 1983-04-27 1985-02-23 ポール　コーポレーシヨン Electromagnetic detector for metallic substance
JPS60253892A (en) * 1984-04-03 1985-12-14 Anritsu Corp Metal detector
US5034689A (en) * 1988-04-13 1991-07-23 Yamato Scale Company, Limited Detector for detecting foreign matter in an object by detecting electromagnetic parameters of the object

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6035285A (en) * 1983-04-27 1985-02-23 ポール　コーポレーシヨン Electromagnetic detector for metallic substance
JPH0352836B2 (en) * 1983-04-27 1991-08-13 Pall Corp
JPS60253892A (en) * 1984-04-03 1985-12-14 Anritsu Corp Metal detector
US5034689A (en) * 1988-04-13 1991-07-23 Yamato Scale Company, Limited Detector for detecting foreign matter in an object by detecting electromagnetic parameters of the object

Also Published As

Publication number Publication date
JPS6332157B2 (en) 1988-06-28

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