GB637336A - Improvements in or relating to apparatus for detecting and/or locating by electrical means masses of electrically conducting or magnetic material - Google Patents
Improvements in or relating to apparatus for detecting and/or locating by electrical means masses of electrically conducting or magnetic materialInfo
- Publication number
- GB637336A GB637336A GB28182/47A GB2818247A GB637336A GB 637336 A GB637336 A GB 637336A GB 28182/47 A GB28182/47 A GB 28182/47A GB 2818247 A GB2818247 A GB 2818247A GB 637336 A GB637336 A GB 637336A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- oscillator
- voltage
- changes
- pick
- 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
- G01V3/104—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)
- Geophysics And Detection Of Objects (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
637,336. Locating conductors. CINEMATELEVISION, Ltd., and LOGAN, S. Y. Oct. 21, 1947, No. 28182. [Class 37] Apparatus for locating conductors of the type comprising a search head 2 with two coils, one from an oscillator 1 and the other acting as a pick-up coil, preferably not inductively coupled, is characterized in that a proportion of the oscillator voltage is fed into two valves 11, 12 of a detector, the first valve also being fed with the pick-up voltage, so that the detector is not affected by changes in oscillator output. Valves 11, 12 are fed through rectifiers 6, 9, the anode voltages being taken to the grids of a double triode valve 17 through R.C. couplings whose time constants are such that slow changes of anode voltage are ignored, and rapid changes (e.g. 3 volts per second) such as caused by pick-up due to the proximity of a conductor produce changes in the anode currents of the respective sections of valve 17 to operate a relay 18 connected between the anodes of the two sections of valve 17. The response of the relay 18 is affected by the phase angle of the voltage induced in the pickup coil. The outputs of the oscillator 1 and amplifier 4 are preferably stabilized.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB28182/47A GB637336A (en) | 1947-10-21 | 1947-10-21 | Improvements in or relating to apparatus for detecting and/or locating by electrical means masses of electrically conducting or magnetic material |
| FR972618D FR972618A (en) | 1947-10-21 | 1948-10-01 | Improvements in electrical detection and identification devices for electrically conductive or magnetic masses |
| CH308309D CH308309A (en) | 1947-10-21 | 1948-10-13 | Electrical apparatus for searching for masses of magnetic materials and electrically conductive materials. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB28182/47A GB637336A (en) | 1947-10-21 | 1947-10-21 | Improvements in or relating to apparatus for detecting and/or locating by electrical means masses of electrically conducting or magnetic material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB637336A true GB637336A (en) | 1950-05-17 |
Family
ID=10271573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB28182/47A Expired GB637336A (en) | 1947-10-21 | 1947-10-21 | Improvements in or relating to apparatus for detecting and/or locating by electrical means masses of electrically conducting or magnetic material |
Country Status (3)
| Country | Link |
|---|---|
| CH (1) | CH308309A (en) |
| FR (1) | FR972618A (en) |
| GB (1) | GB637336A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2545218A1 (en) * | 1983-04-27 | 1984-11-02 | Pall Corp | ELECTROMAGNETIC DETECTOR FOR METALLIC MATERIALS |
| US4709213A (en) * | 1982-07-23 | 1987-11-24 | Garrett Electronics, Inc. | Metal detector having digital signal processing |
-
1947
- 1947-10-21 GB GB28182/47A patent/GB637336A/en not_active Expired
-
1948
- 1948-10-01 FR FR972618D patent/FR972618A/en not_active Expired
- 1948-10-13 CH CH308309D patent/CH308309A/en unknown
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4709213A (en) * | 1982-07-23 | 1987-11-24 | Garrett Electronics, Inc. | Metal detector having digital signal processing |
| FR2545218A1 (en) * | 1983-04-27 | 1984-11-02 | Pall Corp | ELECTROMAGNETIC DETECTOR FOR METALLIC MATERIALS |
| EP0124042A2 (en) * | 1983-04-27 | 1984-11-07 | Pall Corporation | Electromagnetic detector for metallic materials |
| EP0124042A3 (en) * | 1983-04-27 | 1985-01-09 | Pall Corporation | Electromagnetic detector for metallic materials |
| US4613815A (en) * | 1983-04-27 | 1986-09-23 | Pall Corporation | Electromagnetic detector for metallic materials having an improved phase detection circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CH308309A (en) | 1955-07-15 |
| FR972618A (en) | 1951-02-01 |
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