GB1241090A - Metal detecting device - Google Patents
Metal detecting deviceInfo
- Publication number
- GB1241090A GB1241090A GB2377169A GB2377169A GB1241090A GB 1241090 A GB1241090 A GB 1241090A GB 2377169 A GB2377169 A GB 2377169A GB 2377169 A GB2377169 A GB 2377169A GB 1241090 A GB1241090 A GB 1241090A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tuned
- metal
- receiver
- signal
- meter
- 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
- G01V3/15—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for use during transport, e.g. by a person, vehicle or boat
Abstract
1,241,090. Electro-physical measurement. ELECTRONIC SENSING PRODUCTS Inc. May 9, 1969, No.23771/69. Heading G1N. A metal detector comprises tuned coaxial transmitter and receiver coils one of which has a reentrant loop so that there is substantially no coupling and only a small signal is received in the absence of metal. The receiver is preferably so placed, and tuned to the higher side of null, that decrease in inductance due to the presence of metal causes an increase in signal. The transmitter is energized with audiomodulated R. F. from a "squegging" oscillator and the tuned receiver coil is fed to a multi-stage transistor amplifier with an adjustable threshold and an A.V.C. feedback from the output stage with a delay network to disregard drift. Signal indication is by meter and phones. In an underwater unit the coils, meter and circuitry are housed in a polyester case shrunk over PVC fittings. An earthed shield of parallel wires may be embedded in the bottom of the case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2377169A GB1241090A (en) | 1969-05-09 | 1969-05-09 | Metal detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2377169A GB1241090A (en) | 1969-05-09 | 1969-05-09 | Metal detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1241090A true GB1241090A (en) | 1971-07-28 |
Family
ID=10201066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2377169A Expired GB1241090A (en) | 1969-05-09 | 1969-05-09 | Metal detecting device |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1241090A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2147706A (en) * | 1983-04-21 | 1985-05-15 | John Hugh Davey Walton | Apparatus for balancing an electrical network |
| GB2231157A (en) * | 1989-04-12 | 1990-11-07 | Anthony Paul Mcmaster | A battery-operated phaseshift metal detector for the underwater environment |
| EP2904428A2 (en) * | 2012-10-04 | 2015-08-12 | Niitek, Inc. | Shieldings for metal detector heads and manufacturing methods thereof |
-
1969
- 1969-05-09 GB GB2377169A patent/GB1241090A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2147706A (en) * | 1983-04-21 | 1985-05-15 | John Hugh Davey Walton | Apparatus for balancing an electrical network |
| GB2231157A (en) * | 1989-04-12 | 1990-11-07 | Anthony Paul Mcmaster | A battery-operated phaseshift metal detector for the underwater environment |
| EP2904428A2 (en) * | 2012-10-04 | 2015-08-12 | Niitek, Inc. | Shieldings for metal detector heads and manufacturing methods thereof |
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