FR2319138B1 - - Google Patents
Info
- Publication number
- FR2319138B1 FR2319138B1 FR7523858A FR7523858A FR2319138B1 FR 2319138 B1 FR2319138 B1 FR 2319138B1 FR 7523858 A FR7523858 A FR 7523858A FR 7523858 A FR7523858 A FR 7523858A FR 2319138 B1 FR2319138 B1 FR 2319138B1
- Authority
- FR
- France
- 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
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- 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
- G01V3/087—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 the earth magnetic field being modified by the objects or geological structures
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/24—Electrical actuation by interference with electromagnetic field distribution
- G08B13/2491—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- General Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geophysics (AREA)
- Electric Clocks (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7523858A FR2319138A1 (fr) | 1975-07-23 | 1975-07-23 | Dispositif de detection d'objets en mouvement par utilisation des perturbations du champ magnetique terrestre |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7523858A FR2319138A1 (fr) | 1975-07-23 | 1975-07-23 | Dispositif de detection d'objets en mouvement par utilisation des perturbations du champ magnetique terrestre |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2319138A1 FR2319138A1 (fr) | 1977-02-18 |
| FR2319138B1 true FR2319138B1 (cg-RX-API-DMAC10.html) | 1979-06-15 |
Family
ID=9158551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR7523858A Granted FR2319138A1 (fr) | 1975-07-23 | 1975-07-23 | Dispositif de detection d'objets en mouvement par utilisation des perturbations du champ magnetique terrestre |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2319138A1 (cg-RX-API-DMAC10.html) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1016980A (en) * | 1963-09-25 | 1966-01-12 | Honeywell Inc | Improved apparatus for detecting ferrous metal objects |
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1975
- 1975-07-23 FR FR7523858A patent/FR2319138A1/fr active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| FR2319138A1 (fr) | 1977-02-18 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |