GB1299183A - Improvements relating to surveying instruments - Google Patents

Improvements relating to surveying instruments

Info

Publication number
GB1299183A
GB1299183A GB4417569A GB4417569A GB1299183A GB 1299183 A GB1299183 A GB 1299183A GB 4417569 A GB4417569 A GB 4417569A GB 4417569 A GB4417569 A GB 4417569A GB 1299183 A GB1299183 A GB 1299183A
Authority
GB
United Kingdom
Prior art keywords
coil
surveying instruments
adjusting
improvements relating
receiving coil
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
GB4417569A
Inventor
Mark Ian Howell
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.)
Radiodetection Ltd
Original Assignee
Electrolocation Ltd
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 Electrolocation Ltd filed Critical Electrolocation Ltd
Priority to GB4417569A priority Critical patent/GB1299183A/en
Priority to DE19702041079 priority patent/DE2041079A1/en
Publication of GB1299183A publication Critical patent/GB1299183A/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
    • G01V3/15—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for use during transport, e.g. by a person, vehicle or boat
    • 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
    • G01V3/108—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 the emitter and the receiver coils or loops being uncoupled by positioning them perpendicularly to each other
    • 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
    • G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Remote Sensing (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Electromagnetism (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

1299183 Surveying instruments ELECTROLOCATION Ltd 27 July 1970 [6 Sept 1969] 44175/69 Heading G1N In an instrument for detecting underground objects comprising a transmitting coil 12 and a receiving coil 17 mounted at right-angles thereto, each coil has a ferrite core. The meter 23 may be calibrated to zero over free ground by adjusting the angle of coil 12 by screws 19 as a coarse adjustment, and, as a fine adjustment, by adjusting a proportion of the output of a ferrite cored choke 20 supplied to the receiving coil in antiphase. Reference has been directed by the Comptroller to Specification 1087216. (For Figures, see next page)
GB4417569A 1969-09-06 1969-09-06 Improvements relating to surveying instruments Expired GB1299183A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB4417569A GB1299183A (en) 1969-09-06 1969-09-06 Improvements relating to surveying instruments
DE19702041079 DE2041079A1 (en) 1969-09-06 1970-08-19 Surveying instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4417569A GB1299183A (en) 1969-09-06 1969-09-06 Improvements relating to surveying instruments

Publications (1)

Publication Number Publication Date
GB1299183A true GB1299183A (en) 1972-12-06

Family

ID=10432122

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4417569A Expired GB1299183A (en) 1969-09-06 1969-09-06 Improvements relating to surveying instruments

Country Status (2)

Country Link
DE (1) DE2041079A1 (en)
GB (1) GB1299183A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4053828A (en) * 1976-05-03 1977-10-11 Xonics, Inc. Metal detector with first and second nested rectangular coils
US4070625A (en) * 1976-09-14 1978-01-24 Dravo Corporation Apparatus for measuring the distance to the floor of the cargo hold of a ship through intervening bulk material
US4295095A (en) * 1979-01-29 1981-10-13 British Gas Corporation Apparatus and method for detecting the location of metallic objects having alternating current passing therethrough
US4348639A (en) * 1979-05-18 1982-09-07 Triple Dee Electronics Inc. Transmitter-receiver loop buried metal object locator with switch controlled reference voltage
GB2149919A (en) * 1983-11-18 1985-06-19 Charles Norman Smyth Metal detector
US4982163A (en) * 1986-08-27 1991-01-01 Aerius Oy Method and a device for the determination of the condition of the insulation of an object coated with an electric insulation
US5863445A (en) * 1997-03-27 1999-01-26 Control Screening L.L.C. Etched coil unibody digital detector

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4053828A (en) * 1976-05-03 1977-10-11 Xonics, Inc. Metal detector with first and second nested rectangular coils
US4070625A (en) * 1976-09-14 1978-01-24 Dravo Corporation Apparatus for measuring the distance to the floor of the cargo hold of a ship through intervening bulk material
US4295095A (en) * 1979-01-29 1981-10-13 British Gas Corporation Apparatus and method for detecting the location of metallic objects having alternating current passing therethrough
US4348639A (en) * 1979-05-18 1982-09-07 Triple Dee Electronics Inc. Transmitter-receiver loop buried metal object locator with switch controlled reference voltage
GB2149919A (en) * 1983-11-18 1985-06-19 Charles Norman Smyth Metal detector
US4982163A (en) * 1986-08-27 1991-01-01 Aerius Oy Method and a device for the determination of the condition of the insulation of an object coated with an electric insulation
US5863445A (en) * 1997-03-27 1999-01-26 Control Screening L.L.C. Etched coil unibody digital detector

Also Published As

Publication number Publication date
DE2041079A1 (en) 1972-01-20

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees