GB818740A - Improvements relating to electronic detecting appliances - Google Patents

Improvements relating to electronic detecting appliances

Info

Publication number
GB818740A
GB818740A GB2183057A GB2183057A GB818740A GB 818740 A GB818740 A GB 818740A GB 2183057 A GB2183057 A GB 2183057A GB 2183057 A GB2183057 A GB 2183057A GB 818740 A GB818740 A GB 818740A
Authority
GB
United Kingdom
Prior art keywords
coil
exploring
condenser
amplifier
switch
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.)
Expired
Application number
GB2183057A
Inventor
Erich Unger
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.)
Metrawatt AG
Original Assignee
Metrawatt AG
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 Metrawatt AG filed Critical Metrawatt AG
Priority to GB2183057A priority Critical patent/GB818740A/en
Publication of GB818740A publication Critical patent/GB818740A/en
Expired 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
    • G01V3/02—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with propagation of electric current
    • G01V3/06—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with propagation of electric current using ac

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Switches With Compound Operations (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)

Abstract

818,740. Electrical detecting devices. METRAWATT A.G. July 10, 1957, No. 21830/57. Class 37. A device for locating conductive objects comprises one or more exploring coils and one or more exploring condensers and a change-over device for switching from use of the coil to use of the condenser or vice-versa. A coil 1 (Fig. 1) is surrounded by and connected to a metal shield 2. When the switch 8 is in the position shown the shield 2 and the casing of the apparatus (indicated diagrammatically at 7) form the two plates of a condenser which is connected across the input terminals of amplifier 3. When switch 8 is altered the coil 1 is connected across these input terminals. The amplifier is preferably of the transistor type and the indicator 6 may be a headphone. The device is preferably provided with a telescopic handle to facilitate exploring places not easily accessible.
GB2183057A 1957-07-10 1957-07-10 Improvements relating to electronic detecting appliances Expired GB818740A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2183057A GB818740A (en) 1957-07-10 1957-07-10 Improvements relating to electronic detecting appliances

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2183057A GB818740A (en) 1957-07-10 1957-07-10 Improvements relating to electronic detecting appliances

Publications (1)

Publication Number Publication Date
GB818740A true GB818740A (en) 1959-08-19

Family

ID=10169522

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2183057A Expired GB818740A (en) 1957-07-10 1957-07-10 Improvements relating to electronic detecting appliances

Country Status (1)

Country Link
GB (1) GB818740A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3988663A (en) * 1975-03-19 1976-10-26 Texaco Inc. Locator for metallic pipe with AC signals impressed
GB2117909A (en) * 1982-03-11 1983-10-19 Robert Charles Franklin Device for locating objects behind surfaces
GB2146128A (en) * 1983-08-30 1985-04-11 Goring Kerr Plc Metal detection apparatus
GB2149919A (en) * 1983-11-18 1985-06-19 Charles Norman Smyth Metal detector
WO1987006010A1 (en) * 1986-03-27 1987-10-08 Duracell International Inc. Capacitive sensor and metal detector for detecting concealed objects
US4859931A (en) * 1986-12-23 1989-08-22 Matsushita Electric Works, Ltd. Electronic detector with capacitor sensor and magnetic field sensor for locating an object behind a wall surface

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3988663A (en) * 1975-03-19 1976-10-26 Texaco Inc. Locator for metallic pipe with AC signals impressed
GB2117909A (en) * 1982-03-11 1983-10-19 Robert Charles Franklin Device for locating objects behind surfaces
GB2159630A (en) * 1982-03-11 1985-12-04 Robert Charles Franklin Device for locating objects behind surfaces
GB2146128A (en) * 1983-08-30 1985-04-11 Goring Kerr Plc Metal detection apparatus
GB2149919A (en) * 1983-11-18 1985-06-19 Charles Norman Smyth Metal detector
WO1987006010A1 (en) * 1986-03-27 1987-10-08 Duracell International Inc. Capacitive sensor and metal detector for detecting concealed objects
US4853617A (en) * 1986-03-27 1989-08-01 Keith Douglas Apparatus having capacitive sensor and metal detector for detecting objects concealed behind surfaces
US4992741A (en) * 1986-03-27 1991-02-12 The Stanley Works Capacitive sensor and metal detector with a display for quantitatively displaying signals resulting from concealed objects
US4859931A (en) * 1986-12-23 1989-08-22 Matsushita Electric Works, Ltd. Electronic detector with capacitor sensor and magnetic field sensor for locating an object behind a wall surface

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