CA2005549A1 - Transient electromagnetic apparatus for detecting irregularities on conductive containers - Google Patents

Transient electromagnetic apparatus for detecting irregularities on conductive containers

Info

Publication number
CA2005549A1
CA2005549A1 CA2005549A CA2005549A CA2005549A1 CA 2005549 A1 CA2005549 A1 CA 2005549A1 CA 2005549 A CA2005549 A CA 2005549A CA 2005549 A CA2005549 A CA 2005549A CA 2005549 A1 CA2005549 A1 CA 2005549A1
Authority
CA
Canada
Prior art keywords
receiver
units
receiver units
containers
noise
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
CA2005549A
Other languages
French (fr)
Other versions
CA2005549C (en
Inventor
Michael F. Gard
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.)
Phillips Petroleum Co
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2005549A1 publication Critical patent/CA2005549A1/en
Application granted granted Critical
Publication of CA2005549C publication Critical patent/CA2005549C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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

Abstract

A transient electromagnetic apparatus for use in detecting irregularities on conductive walls of containers forms a multichannel distributed system and includes at least one transmitting antenna, at least one transmitter unit, plural receiving antennas, plural receiver units, and a computer for controlling the transmitter and receiver units. The receiver units each include elements that suppress noise in the received signals. Each receiver unit has a preamplifier, first and second low pass Bessel type filters, a gain ranging amplifier, and an A/D converter. The gain ranging amplifier receives feedback from the output of the A/D
converter and provides increased small signal resolution.
Each receiver unit also rejects common mode noise with a choke and balanced input impedances in the preamplifier.
The apparatus allows an arbitrary number of receiving antennas, receiver units, and even transmitting antennas, and transmitting units, so that the apparatus can be configured to a variety of containers. Each receiver unit has control logic for controlling the electronics therein and memory for storing data for transfer to the computer. The apparatus includes a median filter for filtering out sferics noise.
CA002005549A 1988-12-29 1989-12-14 Transient electromagnetic apparatus for detecting irregularities on conductive containers Expired - Fee Related CA2005549C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/291,608 US4906928A (en) 1988-12-29 1988-12-29 Transient electromagnetic apparatus with receiver having digitally controlled gain ranging amplifier for detecting irregularities on conductive containers
US07/291,608 1988-12-29

Publications (2)

Publication Number Publication Date
CA2005549A1 true CA2005549A1 (en) 1990-06-29
CA2005549C CA2005549C (en) 2000-04-25

Family

ID=23121010

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002005549A Expired - Fee Related CA2005549C (en) 1988-12-29 1989-12-14 Transient electromagnetic apparatus for detecting irregularities on conductive containers

Country Status (8)

Country Link
US (1) US4906928A (en)
EP (1) EP0379804B1 (en)
JP (1) JP2834813B2 (en)
AU (1) AU612533B2 (en)
CA (1) CA2005549C (en)
DE (1) DE68915527T2 (en)
HK (1) HK1005471A1 (en)
NO (1) NO302634B1 (en)

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CA2005551C (en) * 1988-12-29 1999-08-31 Pedro F. Lara Transient electromagnetic method for detecting irregularities on conductive containers having variations in jacket thickness
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DE29608664U1 (en) * 1996-05-13 1997-09-18 Debnar Beinssen Angelika Dipl Device for testing the material of a metallic wall
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US7304829B2 (en) * 2005-02-16 2007-12-04 General Electric Company Apparatus and method for filtering current sensor output signals
US7253614B2 (en) * 2005-03-21 2007-08-07 Allegro Microsystems, Inc. Proximity detector having a sequential flow state machine
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US8598867B2 (en) 2010-06-04 2013-12-03 Allegro Microsystems, Llc Circuits and methods for generating a threshold signal used in a motion detector
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
CA2813496C (en) 2010-10-07 2018-12-04 Mettler-Toledo Safeline Limited Method for operating 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
US9018935B2 (en) 2011-09-19 2015-04-28 Mettler-Toledo Safeline Limited Method for operating a metal detection apparatus and apparatus
US9520871B2 (en) 2012-01-05 2016-12-13 Allegro Microsystems, Llc Methods and apparatus for supply voltage transient protection for maintaining a state of a sensor output signal
US9329057B2 (en) 2012-05-31 2016-05-03 Allegro Microsystems, Llc Gear tooth sensor with peak and threshold detectors
CN102944340B (en) * 2012-11-10 2014-07-23 大连理工大学 Charge-voltage converter for piezoelectric intelligent aggregate seismic damage monitoring system
US8723512B1 (en) 2012-11-26 2014-05-13 Allegro Microsystems, Llc Circuits and methods for generating a threshold signal used in a magnetic field sensor based on a peak signal associated with a prior cycle of a magnetic field signal
JP6502943B2 (en) 2013-08-30 2019-04-17 アレグロ・マイクロシステムズ・エルエルシー Circuit and method for generating a threshold signal used in a motion detector according to a least common multiple of a set of possible quantities of features on a target
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CN107797150B (en) * 2017-11-22 2023-09-15 中国地质大学（武汉） Transient electromagnetic instrument receiver
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Also Published As

Publication number Publication date
AU612533B2 (en) 1991-07-11
DE68915527T2 (en) 1994-10-20
JP2834813B2 (en) 1998-12-14
EP0379804B1 (en) 1994-05-25
NO895276D0 (en) 1989-12-27
NO895276L (en) 1990-07-02
HK1005471A1 (en) 1999-01-08
CA2005549C (en) 2000-04-25
EP0379804A3 (en) 1991-03-06
NO302634B1 (en) 1998-03-30
EP0379804A2 (en) 1990-08-01
AU4736489A (en) 1990-07-05
DE68915527D1 (en) 1994-06-30
US4906928A (en) 1990-03-06
JPH02298852A (en) 1990-12-11

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MKLA Lapsed
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Effective date: 20041214