GB574808A - Improvements in or relating to apparatus for detecting and/or locating by electricalmeans masses of electrically conducting or magnetic material - Google Patents

Improvements in or relating to apparatus for detecting and/or locating by electricalmeans masses of electrically conducting or magnetic material

Info

Publication number
GB574808A
GB574808A GB808643A GB808643A GB574808A GB 574808 A GB574808 A GB 574808A GB 808643 A GB808643 A GB 808643A GB 808643 A GB808643 A GB 808643A GB 574808 A GB574808 A GB 574808A
Authority
GB
United Kingdom
Prior art keywords
coils
coupling
change
magnetic material
locating
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
GB808643A
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.)
STANLEY SPENCER WEST
Cinema Television Ltd
Original Assignee
STANLEY SPENCER WEST
Cinema Television 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 STANLEY SPENCER WEST, Cinema Television Ltd filed Critical STANLEY SPENCER WEST
Priority to GB808643A priority Critical patent/GB574808A/en
Publication of GB574808A publication Critical patent/GB574808A/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

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)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

574,808. Locating conductors. CINEMATELEVISION, Ltd., and WEST, S. S. May 21, 1943, Nos. 8086 and 14884. [Class 37] Apparatus for locating masses of electrically conducting or magnetic material comprises an electrical oscillatory circuit including coupled coils, the circuit being arranged to command or cease oscillation as a result of a change in the coupling of the coils due to a change in the amount of electrically conducting or magnetic material in the vicinity of the coils. In the embodiment shown in Fig. 1 a valve 3 is arranged as an oscillator by back-coupling the tuned anode circuit 1, 6 to the tuned grid circuit 2, 8 by means of the coupling between coils 1, 2. Coils 1, 2, Fig. 2, are arranged as a movable search head and are physically associated so as to have zero coupling. Resistances 4, 7 are adjusted so that the value 3 is on the verge of oscillating. When coils 1, 2 approach a conducting body, the increase in the coupling causes the valve 3 to oscillate and an indication is given in headphones 5. Alternatively a change in amplitude of the oscillation is used to indicate the presence of a conducting body. Several ways of arranging the coils are described, Fig. 3 (not shown). Also means for adjusting the initial degree of coupling of the coils by means of dust cases or auxiliary coils are also described, Figs. 5 and 6 (not shown). Further, the change in anode current due to increased oscillation may be used to operate a relay or may switch on a second oscillator to give an indication.
GB808643A 1943-05-21 1943-05-21 Improvements in or relating to apparatus for detecting and/or locating by electricalmeans masses of electrically conducting or magnetic material Expired GB574808A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB808643A GB574808A (en) 1943-05-21 1943-05-21 Improvements in or relating to apparatus for detecting and/or locating by electricalmeans masses of electrically conducting or magnetic material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB808643A GB574808A (en) 1943-05-21 1943-05-21 Improvements in or relating to apparatus for detecting and/or locating by electricalmeans masses of electrically conducting or magnetic material

Publications (1)

Publication Number Publication Date
GB574808A true GB574808A (en) 1946-01-22

Family

ID=9845480

Family Applications (1)

Application Number Title Priority Date Filing Date
GB808643A Expired GB574808A (en) 1943-05-21 1943-05-21 Improvements in or relating to apparatus for detecting and/or locating by electricalmeans masses of electrically conducting or magnetic material

Country Status (1)

Country Link
GB (1) GB574808A (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2587686A (en) * 1948-04-27 1952-03-04 Robert R Berry Ore sorting system
US2997645A (en) * 1957-11-15 1961-08-22 Halliburton Co Induction well logging system
US3202909A (en) * 1964-01-22 1965-08-24 Stewart Chandler Variable frequency oscillator type of metal detector sensitive to mutual resistance changes
DE1227955B (en) * 1961-12-27 1966-11-03 Licentia Gmbh initiator
US3449661A (en) * 1963-12-11 1969-06-10 Magnaflux Corp Eddy current testing system having lift-off compensation,and utilizing a tuned plate-tuned grid oscillator
US3457502A (en) * 1967-04-25 1969-07-22 Quantum Eng Inc Highly-stable orthogonal electric coil configuration
US3719882A (en) * 1970-11-12 1973-03-06 A Pincus Resonant circuit apparatus for detecting electromagnetic conductive bodies
US5006806A (en) * 1989-03-15 1991-04-09 Schonstedt Instrument Company Methods and apparatus employing permanent magnets for marking, locating, tracing and identifying hidden objects such as burried fiber optic cables
US5017873A (en) * 1989-03-15 1991-05-21 Schonstedt Instrument Company Methods and apparatus employing permanent magnets for marking, locating, tracing and identifying hidden objects such as buried fiber optic cables
US5122750A (en) * 1989-03-15 1992-06-16 Schonstedt Instrument Company Methods employing permanent magnets for marking, locating, tracing and identifying hidden objects such as buried fiber optic cables
USRE34701E (en) * 1989-12-18 1994-08-23 Gas Research Institute Magnetically detectable plastic pipe

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2587686A (en) * 1948-04-27 1952-03-04 Robert R Berry Ore sorting system
US2997645A (en) * 1957-11-15 1961-08-22 Halliburton Co Induction well logging system
DE1227955B (en) * 1961-12-27 1966-11-03 Licentia Gmbh initiator
US3449661A (en) * 1963-12-11 1969-06-10 Magnaflux Corp Eddy current testing system having lift-off compensation,and utilizing a tuned plate-tuned grid oscillator
US3202909A (en) * 1964-01-22 1965-08-24 Stewart Chandler Variable frequency oscillator type of metal detector sensitive to mutual resistance changes
US3457502A (en) * 1967-04-25 1969-07-22 Quantum Eng Inc Highly-stable orthogonal electric coil configuration
US3719882A (en) * 1970-11-12 1973-03-06 A Pincus Resonant circuit apparatus for detecting electromagnetic conductive bodies
US5006806A (en) * 1989-03-15 1991-04-09 Schonstedt Instrument Company Methods and apparatus employing permanent magnets for marking, locating, tracing and identifying hidden objects such as burried fiber optic cables
US5017873A (en) * 1989-03-15 1991-05-21 Schonstedt Instrument Company Methods and apparatus employing permanent magnets for marking, locating, tracing and identifying hidden objects such as buried fiber optic cables
US5122750A (en) * 1989-03-15 1992-06-16 Schonstedt Instrument Company Methods employing permanent magnets for marking, locating, tracing and identifying hidden objects such as buried fiber optic cables
USRE34701E (en) * 1989-12-18 1994-08-23 Gas Research Institute Magnetically detectable plastic pipe

Similar Documents

Publication Publication Date Title
GB574808A (en) Improvements in or relating to apparatus for detecting and/or locating by electricalmeans masses of electrically conducting or magnetic material
US2337251A (en) Alternating current relay
US2078845A (en) Safety razor and vibratory motor therefor
GB684626A (en) Improvements in or relating to electric amplifier arrangements of the kind which includes a magnetic amplifier
GB871499A (en) Electromagnetically operable electric switches
GB605124A (en) Improvements in and relating to electric air circuit breakers
GB641489A (en) Improvements in and relating to magnetrons
GB607572A (en) Improved apparatus for heating materials by means of high frequency electric currents
GB1038107A (en) Improvements in or relating to changeover switches
GB764813A (en) Improvements in or relating to electric oscillation generators
GB527806A (en) Improvements in apparatus adapted to be supplied by a vibrator from a direct current supply
GB697253A (en) Electrical proximity switches
GB663976A (en) Modulation of electric oscillations employing the phenomena of super-conductivity
GB711178A (en) Improvements in or relating to thermionic valve oscillation generators
GB1256079A (en) Improvements in or relating to apparatus for measuring mechanical impedance or mobility
GB757063A (en) Improvements in or relating to crystal-controlled oscillators
GB601924A (en) Improvements in or relating to an electrical oscillating system having protective means
GB926322A (en) Improvements in or relating to electrical resonant circuits
GB567189A (en) Improvements in electric valve oscillators
GB687038A (en) Improvements in or relating to keying circuits for oscillators
GB555750A (en) Electric wave oscillation generators
GB625360A (en) Improvements in electrical oscillation generators
GB782230A (en) Improvements in or relating to magnetic recording apparatus
GB757665A (en) Method of crystal switching for high frequency oscillators
AU134608B2 (en) Improvements in switches for high frequency electrical oscillations