GB575443A - Improvements in or relating to methods of detecting and/or locating by electrical means masses of electrically conducting or magnetic material - Google Patents
Improvements in or relating to methods of detecting and/or locating by electrical means masses of electrically conducting or magnetic materialInfo
- Publication number
- GB575443A GB575443A GB505943A GB505943A GB575443A GB 575443 A GB575443 A GB 575443A GB 505943 A GB505943 A GB 505943A GB 505943 A GB505943 A GB 505943A GB 575443 A GB575443 A GB 575443A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coil
- bridge
- resistance
- search
- variable
- 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
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
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)
- Electronic Switches (AREA)
Abstract
575,443. Locating conductors ; temperature compensation. CINEMA-TELEVISION, Ltd., and WEST, S. S. March 29, 1943, Nos. 5059 and 5060. [Class 37] The proximity of masses of conducting or magnetic material is detected by a balanced bridge circuit with a search coil in one arm, temperature changes being compensated by the use of auxiliary non-inductive coils. The search coil may comprise the degaussing coil provided on a ship as a safeguard against magnetic mines. As shown, two arms 3, 4 of the bridge comprise the tapped secondary of a transformer fed from an electronic oscillator, alternator or the like. The other two arms of the bridge comprise a dust-core coil 2 of variable inductance, and the search coil 1. Associated physically with the search coil 1 is a non-inductive coil 5 which has the same resistance-temperature characteristic as the coil 1 and is connected in series with the coil 2. Another non-inductive coil 6 is associated with the coil 2 and connected in series with the coil 1 and with a variable resistance 7. The bridge is balanced by the adjustable elements 2, 7 ; and when the search coil approaches metal objects, the bridge is unbalanced and voltages appear across the output terminals 10, 11 which may be taken to an amplifier feeding an indicator. In a modification, Fig. 2 (not shown), the driving voltage is applied across a tapped resistance which replaces the input transformer. In this case the coil 2 need not be variable, but a variable resistance is included in one branch of the tapped resistance.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB505943A GB575443A (en) | 1943-03-29 | 1943-03-29 | Improvements in or relating to methods of detecting and/or locating by electrical means masses of electrically conducting or magnetic material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB505943A GB575443A (en) | 1943-03-29 | 1943-03-29 | Improvements in or relating to methods of detecting and/or locating by electrical means masses of electrically conducting or magnetic material |
Publications (1)
Publication Number | Publication Date |
---|---|
GB575443A true GB575443A (en) | 1946-02-19 |
Family
ID=9788989
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB505943A Expired GB575443A (en) | 1943-03-29 | 1943-03-29 | Improvements in or relating to methods of detecting and/or locating by electrical means masses of electrically conducting or magnetic material |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB575443A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3659194A (en) * | 1970-11-25 | 1972-04-25 | Alfred A Blackerby | Magnetic sensor having a heat treated housing for collimating the sensor{40 s flux |
US3939403A (en) * | 1974-04-11 | 1976-02-17 | Stassart Marie Claire | Device for maintaining constant the temperature of a coil fed by an A.C. current source |
FR2471823A1 (en) * | 1979-12-19 | 1981-06-26 | Wieland Werke Ag | METHOD AND DEVICE FOR REGULATING THE HEIGHT OF THE CASTING LEVEL IN CONTINUOUS CASTING SHELLS |
-
1943
- 1943-03-29 GB GB505943A patent/GB575443A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3659194A (en) * | 1970-11-25 | 1972-04-25 | Alfred A Blackerby | Magnetic sensor having a heat treated housing for collimating the sensor{40 s flux |
US3939403A (en) * | 1974-04-11 | 1976-02-17 | Stassart Marie Claire | Device for maintaining constant the temperature of a coil fed by an A.C. current source |
FR2471823A1 (en) * | 1979-12-19 | 1981-06-26 | Wieland Werke Ag | METHOD AND DEVICE FOR REGULATING THE HEIGHT OF THE CASTING LEVEL IN CONTINUOUS CASTING SHELLS |
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