DE2031523B2 - - Google Patents
Info
- Publication number
- DE2031523B2 DE2031523B2 DE19702031523 DE2031523A DE2031523B2 DE 2031523 B2 DE2031523 B2 DE 2031523B2 DE 19702031523 DE19702031523 DE 19702031523 DE 2031523 A DE2031523 A DE 2031523A DE 2031523 B2 DE2031523 B2 DE 2031523B2
- Authority
- DE
- Germany
- Prior art keywords
- frequency
- coils
- circuit
- khz
- direct current
- 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.)
- Granted
Links
- 230000005291 magnetic effect Effects 0.000 claims description 17
- 230000000712 assembly Effects 0.000 claims 1
- 238000000429 assembly Methods 0.000 claims 1
- 230000002500 effect on skin Effects 0.000 claims 1
- 230000010355 oscillation Effects 0.000 claims 1
- 239000002184 metal Substances 0.000 description 27
- 229910052751 metal Inorganic materials 0.000 description 27
- 230000008859 change Effects 0.000 description 5
- 230000004907 flux Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000001960 triggered effect Effects 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003302 ferromagnetic material Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geophysics (AREA)
- Burglar Alarm Systems (AREA)
- Geophysics And Detection Of Objects (AREA)
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU5707869 | 1969-06-26 | ||
| AU5707769 | 1969-06-26 | ||
| AU5780069 | 1969-07-11 | ||
| AU5912369 | 1969-08-06 | ||
| AU6556369 | 1969-12-22 | ||
| AUPA005870 | 1970-01-12 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DE2031523A1 DE2031523A1 (de) | 1971-02-25 |
| DE2031523B2 true DE2031523B2 (OSRAM) | 1975-04-30 |
| DE2031523C3 DE2031523C3 (de) | 1976-01-08 |
Family
ID=27542766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19702031523 Expired DE2031523C3 (de) | 1969-06-26 | 1970-06-25 | Alarmanlage |
Country Status (5)
| Country | Link |
|---|---|
| DE (1) | DE2031523C3 (OSRAM) |
| FR (1) | FR2054591A1 (OSRAM) |
| GB (1) | GB1320153A (OSRAM) |
| IL (1) | IL34799A (OSRAM) |
| SE (1) | SE361949B (OSRAM) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2314509A1 (fr) * | 1975-06-11 | 1977-01-07 | Dumesnil Gerard | Procede et dispositif pour la detection de corps ferromagnetiques a fort champ coercitif notamment pour controler les acces aux lieux publics |
| DE3152533C2 (de) * | 1980-01-15 | 1984-06-07 | Matsushita Electric Works, Ltd., Kadoma, Osaka | Eindringlingwarnanlage |
| FR2510764A1 (fr) * | 1981-07-30 | 1983-02-04 | Franquet Leon | Dispositif de detection d'objets metalliques, tels que des armes a feu, et sas d'acces de locaux equipes de tels dispositifs |
| GB2220444A (en) * | 1988-07-06 | 1990-01-10 | Paul Francis Creer | Revolving security door |
| AU2001220416A1 (en) * | 2000-10-04 | 2002-04-15 | Adt Security Services, Inc. | Ingress/egress control system for airport concourses and other access controlledareas |
-
1970
- 1970-06-24 GB GB3055870A patent/GB1320153A/en not_active Expired
- 1970-06-25 SE SE880170A patent/SE361949B/xx unknown
- 1970-06-25 IL IL3479970A patent/IL34799A/en unknown
- 1970-06-25 DE DE19702031523 patent/DE2031523C3/de not_active Expired
- 1970-06-26 FR FR7023730A patent/FR2054591A1/fr active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| IL34799A (en) | 1973-01-30 |
| DE2031523C3 (de) | 1976-01-08 |
| SE361949B (OSRAM) | 1973-11-19 |
| GB1320153A (en) | 1973-06-13 |
| FR2054591A1 (OSRAM) | 1971-04-23 |
| DE2031523A1 (de) | 1971-02-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C3 | Grant after two publication steps (3rd publication) | ||
| E77 | Valid patent as to the heymanns-index 1977 | ||
| EHJ | Ceased/non-payment of the annual fee |