GB1228645A - - Google Patents

Info

Publication number
GB1228645A
GB1228645A GB1228645DA GB1228645A GB 1228645 A GB1228645 A GB 1228645A GB 1228645D A GB1228645D A GB 1228645DA GB 1228645 A GB1228645 A GB 1228645A
Authority
GB
United Kingdom
Prior art keywords
rock
coal
detector
signals
detected
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
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 filed Critical
Publication of GB1228645A publication Critical patent/GB1228645A/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
    • G01V3/101—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 by measuring the impedance of the search coil; by measuring features of a resonant circuit comprising the search coil
    • G01V3/102—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 by measuring the impedance of the search coil; by measuring features of a resonant circuit comprising the search coil by measuring amplitude
    • 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

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)
  • Geophysics And Detection Of Objects (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

1,228,645. Proximity detectors. BERGWERKSVERBAND G.m.b.H. May 24, 1968 [June 1, 1967], No. 24989/68. Heading G1N. A rock/ coal interface is detected by its effect on a tuned circuit with a capacitative probe. The circuit is fed from a variable frequency oscillator and both the change in frequency of the circuits and the change in magnitude of the resonance voltage (due to different losses in rock/coal) are detected. These signals are characteristic of the material and are composed with previously determined curves for variation of the signals with spacing of the detector from rock and coal. A detector with a V. F.O. tunable by a capacitor diode energized from a sawtooth sweep oscillator which is gated to stop at resonance is outlined with reference to Fig. 4 (not shown).
GB1228645D 1967-06-01 1968-05-24 Expired GB1228645A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB0092812 1967-06-01

Publications (1)

Publication Number Publication Date
GB1228645A true GB1228645A (en) 1971-04-15

Family

ID=6986607

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1228645D Expired GB1228645A (en) 1967-06-01 1968-05-24

Country Status (3)

Country Link
DE (1) DE1698658B1 (en)
FR (1) FR1574261A (en)
GB (1) GB1228645A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4212363C2 (en) * 1992-04-13 1997-10-02 Klaus Ebinger Ing Metal detector

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE254478C (en) *
DE378224C (en) * 1922-09-20 1923-11-16 Erda Akt Ges Device for determining the direction, intensity and polarization state of electrical waves, especially for earth exploration purposes in mines
FR883046A (en) * 1941-07-19 1943-06-22 Lorenz C Ag Method for eliminating terrestrial influence in devices intended to determine the position of metallic bodies hidden in the ground
DE1192758B (en) * 1949-12-07 1965-05-13 Dr Friedrich Ludwig Machts Transmitting and receiving device for finding geological differences in the ground and bodies hidden from the eye
DE932509C (en) * 1953-06-14 1955-09-01 Socony Vacuum Oil Company Dielectric investigation of penetrated soil layers
DE1025077B (en) * 1955-09-17 1958-02-27 Asea Ab An arrangement consisting of an oscillation circuit for examining material

Also Published As

Publication number Publication date
DE1698658B1 (en) 1971-02-04
FR1574261A (en) 1969-07-11

Similar Documents

Publication Publication Date Title
GB1106185A (en) Device for measuring a property of a material
GB1234315A (en)
GB1165963A (en) Improved Base Line Control Circuit Means
GB1402500A (en) Gfi circuit having tuned circuit fault detector
GB1092362A (en) Improvements in detectors for electrically conductive or magnetic particles
US3375493A (en) Inductive loop presence detector
GB1228645A (en)
GB1190459A (en) A Circuit Arrangement for Automatically Tuning a Communication Apparatus.
GB1276997A (en) Position sensing circuit
GB1043772A (en) Stabilized signal source
GB1210393A (en) Automatic frequency control of oscillator
GB1113864A (en) Method and means for measuring linear or angular displacement
GB1122329A (en) Inductive loop vehicle detector
GB1209985A (en) Improvements in or relating to vehicle detector circuit arrangements
GB1356605A (en) Fire detector apparatus
GB1195601A (en) Mineral Sorting Apparatus
US3491359A (en) Frequency swept reply radar transponder
GB1088919A (en) Proximity detecting apparatus
GB1425761A (en) Detector circuits
SE329013B (en)
GB1280072A (en) Capacitance responsive circuit
US2922121A (en) Gated beam tube relaxation oscillator
GB1165936A (en) Improvements in or relating to Swept Frequency Generators
GB1243590A (en) Frequency divider
DIN Extremal system with a controlled frequency of the search signals(Extremal system with second control loop for search signal frequency regulation to optimize primary loop operation, determining system dynamic errors under random drift)

Legal Events

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