GB860197A - Improvements in or relating to apparatus for detecting ferromagnetic and electrically - Google Patents

Improvements in or relating to apparatus for detecting ferromagnetic and electrically

Info

Publication number
GB860197A
GB860197A GB1703157A GB1703157A GB860197A GB 860197 A GB860197 A GB 860197A GB 1703157 A GB1703157 A GB 1703157A GB 1703157 A GB1703157 A GB 1703157A GB 860197 A GB860197 A GB 860197A
Authority
GB
United Kingdom
Prior art keywords
output
input
oscillator
frequency
circuit
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
GB1703157A
Inventor
Walter Richard Walls
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.)
Rank Cintel Ltd
Original Assignee
Rank Cintel 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 Rank Cintel Ltd filed Critical Rank Cintel Ltd
Priority to GB1703157A priority Critical patent/GB860197A/en
Publication of GB860197A publication Critical patent/GB860197A/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
    • G01V3/08—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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

860,197. Electric tests. RANK CINTEL Ltd. May 29, 1958 [May 29, 1957], No. 17031/57. Drawings to Specification. Class 37. In known systems for detecting magnetic or electrically conductive bodies, the coupling between coils connected to an amplifier input and output respectively is varied by the presence of the body so that the circuit oscillates. In order to distinguish between different bodies which cause the circuit to oscillate at frequencies which differ only slightly, the oscillator output is caused to beat with the output from a separate oscillator, the frequency of which is of the same order so that the difference frequency which may be in the audible range enables objects to be distinguished. Earphones may be used and a filter circuit may be connected between the mixer output and the indicator device or between the oscillator output and the mixer to assist in separating a desired signal. The input coil is shunted by a tuning condenser and the output coil may be shunted also so that it is resonant at the same frequency as the input.
GB1703157A 1957-05-29 1957-05-29 Improvements in or relating to apparatus for detecting ferromagnetic and electrically Expired GB860197A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1703157A GB860197A (en) 1957-05-29 1957-05-29 Improvements in or relating to apparatus for detecting ferromagnetic and electrically

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1703157A GB860197A (en) 1957-05-29 1957-05-29 Improvements in or relating to apparatus for detecting ferromagnetic and electrically

Publications (1)

Publication Number Publication Date
GB860197A true GB860197A (en) 1961-02-01

Family

ID=10087982

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1703157A Expired GB860197A (en) 1957-05-29 1957-05-29 Improvements in or relating to apparatus for detecting ferromagnetic and electrically

Country Status (1)

Country Link
GB (1) GB860197A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3719882A (en) * 1970-11-12 1973-03-06 A Pincus Resonant circuit apparatus for detecting electromagnetic conductive bodies

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3719882A (en) * 1970-11-12 1973-03-06 A Pincus Resonant circuit apparatus for detecting electromagnetic conductive bodies

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