ES227056A1 - Improvements in or relating to geophysical survey apparatus - Google Patents

Improvements in or relating to geophysical survey apparatus

Info

Publication number
ES227056A1
ES227056A1 ES0227056A ES227056A ES227056A1 ES 227056 A1 ES227056 A1 ES 227056A1 ES 0227056 A ES0227056 A ES 0227056A ES 227056 A ES227056 A ES 227056A ES 227056 A1 ES227056 A1 ES 227056A1
Authority
ES
Spain
Prior art keywords
voltage
phase
coil
amplifier
reference voltage
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
ES0227056A
Other languages
Spanish (es)
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.)
Mullard Radio Valve Co Ltd
Original Assignee
Mullard Radio Valve Co 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 Mullard Radio Valve Co Ltd filed Critical Mullard Radio Valve Co Ltd
Publication of ES227056A1 publication Critical patent/ES227056A1/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
    • G01V3/165—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 operating with magnetic or electric fields produced or modified by the object or by the detecting device

Landscapes

  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • Remote Sensing (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

Geophysical mapping and prospecting apparatus for measuring the distortion of an electromagnetic field caused by minerals or other conductive geological forms, which has in combination an emission coil, a generator to supply a low frequency current to said coil that allows it to generate said field, a receiving coil, reference means for outputting from said transmission coil a reference voltage of the same frequency as that of the current in said coil, an adjustable phase slip attenuator, the input of which is connected to said reference means, an amplifier whose input is powered by the difference between the output voltages of said receiving coil and the attenuator, band-pass filtering means, to filter the input voltage of the amplifier, means for adjusting said phase slip attenuator so that in the absence of such geological formations, the output voltage of said amplific it is null or practically null, a phase sensitive detector for detecting the output voltage of said amplifier, a detector that is also powered by two phase reference voltage components, taken from said reference voltage, one of said two being components essentially in phase with said reference voltage and the other essentially quadrature with said reference voltage, all in such a way that the output voltage of said phase sensitive detector essentially constitutes a measure of the phase voltage components and in squaring the voltage obtained at the output of said amplifier. (Machine-translation by Google Translate, not legally binding)
ES0227056A 1955-03-04 1956-03-02 Improvements in or relating to geophysical survey apparatus Expired ES227056A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB646055A GB829861A (en) 1955-03-04 1955-03-04 Improvements in or relating to geophysical survey apparatus

Publications (1)

Publication Number Publication Date
ES227056A1 true ES227056A1 (en) 1957-03-01

Family

ID=9814871

Family Applications (1)

Application Number Title Priority Date Filing Date
ES0227056A Expired ES227056A1 (en) 1955-03-04 1956-03-02 Improvements in or relating to geophysical survey apparatus

Country Status (2)

Country Link
ES (1) ES227056A1 (en)
GB (1) GB829861A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8407009D0 (en) * 1984-03-17 1984-04-18 Parkway Instr Co Operative Ltd Locating and detecting metal objects
GB2173903B (en) * 1985-04-18 1988-07-06 Shell Int Research A method and system for primary field compensation in a towed receiver for airborne electromagnetic survey systems

Also Published As

Publication number Publication date
GB829861A (en) 1960-03-09

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