GB818740A - Improvements relating to electronic detecting appliances - Google Patents
Improvements relating to electronic detecting appliancesInfo
- Publication number
- GB818740A GB818740A GB2183057A GB2183057A GB818740A GB 818740 A GB818740 A GB 818740A GB 2183057 A GB2183057 A GB 2183057A GB 2183057 A GB2183057 A GB 2183057A GB 818740 A GB818740 A GB 818740A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coil
- exploring
- condenser
- amplifier
- switch
- 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
- G01V3/02—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with propagation of electric current
- G01V3/06—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with propagation of electric current using ac
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Switches With Compound Operations (AREA)
- Switches That Are Operated By Magnetic Or Electric Fields (AREA)
Abstract
818,740. Electrical detecting devices. METRAWATT A.G. July 10, 1957, No. 21830/57. Class 37. A device for locating conductive objects comprises one or more exploring coils and one or more exploring condensers and a change-over device for switching from use of the coil to use of the condenser or vice-versa. A coil 1 (Fig. 1) is surrounded by and connected to a metal shield 2. When the switch 8 is in the position shown the shield 2 and the casing of the apparatus (indicated diagrammatically at 7) form the two plates of a condenser which is connected across the input terminals of amplifier 3. When switch 8 is altered the coil 1 is connected across these input terminals. The amplifier is preferably of the transistor type and the indicator 6 may be a headphone. The device is preferably provided with a telescopic handle to facilitate exploring places not easily accessible.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2183057A GB818740A (en) | 1957-07-10 | 1957-07-10 | Improvements relating to electronic detecting appliances |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2183057A GB818740A (en) | 1957-07-10 | 1957-07-10 | Improvements relating to electronic detecting appliances |
Publications (1)
Publication Number | Publication Date |
---|---|
GB818740A true GB818740A (en) | 1959-08-19 |
Family
ID=10169522
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2183057A Expired GB818740A (en) | 1957-07-10 | 1957-07-10 | Improvements relating to electronic detecting appliances |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB818740A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3988663A (en) * | 1975-03-19 | 1976-10-26 | Texaco Inc. | Locator for metallic pipe with AC signals impressed |
GB2117909A (en) * | 1982-03-11 | 1983-10-19 | Robert Charles Franklin | Device for locating objects behind surfaces |
GB2146128A (en) * | 1983-08-30 | 1985-04-11 | Goring Kerr Plc | Metal detection apparatus |
GB2149919A (en) * | 1983-11-18 | 1985-06-19 | Charles Norman Smyth | Metal detector |
WO1987006010A1 (en) * | 1986-03-27 | 1987-10-08 | Duracell International Inc. | Capacitive sensor and metal detector for detecting concealed objects |
US4859931A (en) * | 1986-12-23 | 1989-08-22 | Matsushita Electric Works, Ltd. | Electronic detector with capacitor sensor and magnetic field sensor for locating an object behind a wall surface |
-
1957
- 1957-07-10 GB GB2183057A patent/GB818740A/en not_active Expired
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3988663A (en) * | 1975-03-19 | 1976-10-26 | Texaco Inc. | Locator for metallic pipe with AC signals impressed |
GB2117909A (en) * | 1982-03-11 | 1983-10-19 | Robert Charles Franklin | Device for locating objects behind surfaces |
GB2159630A (en) * | 1982-03-11 | 1985-12-04 | Robert Charles Franklin | Device for locating objects behind surfaces |
GB2146128A (en) * | 1983-08-30 | 1985-04-11 | Goring Kerr Plc | Metal detection apparatus |
GB2149919A (en) * | 1983-11-18 | 1985-06-19 | Charles Norman Smyth | Metal detector |
WO1987006010A1 (en) * | 1986-03-27 | 1987-10-08 | Duracell International Inc. | Capacitive sensor and metal detector for detecting concealed objects |
US4853617A (en) * | 1986-03-27 | 1989-08-01 | Keith Douglas | Apparatus having capacitive sensor and metal detector for detecting objects concealed behind surfaces |
US4992741A (en) * | 1986-03-27 | 1991-02-12 | The Stanley Works | Capacitive sensor and metal detector with a display for quantitatively displaying signals resulting from concealed objects |
US4859931A (en) * | 1986-12-23 | 1989-08-22 | Matsushita Electric Works, Ltd. | Electronic detector with capacitor sensor and magnetic field sensor for locating an object behind a wall surface |
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