BE475910A - - Google Patents
Info
- Publication number
- BE475910A BE475910A BE475910DA BE475910A BE 475910 A BE475910 A BE 475910A BE 475910D A BE475910D A BE 475910DA BE 475910 A BE475910 A BE 475910A
- Authority
- BE
- Belgium
- Prior art keywords
- current
- rectifier
- installation
- relay
- microphone
- Prior art date
Links
- 238000009434 installation Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 6
- 230000010355 oscillation Effects 0.000 claims description 5
- 210000001015 abdomen Anatomy 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001960 triggered effect Effects 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
- G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
- G08B13/1609—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems
- G08B13/1618—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems using ultrasonic detection means
- G08B13/1627—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems using ultrasonic detection means using Doppler shift detection circuits
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Burglar Alarm Systems (AREA)
- Emergency Alarm Devices (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE475910A true BE475910A (OSRAM) |
Family
ID=124453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE475910D BE475910A (OSRAM) |
Country Status (1)
| Country | Link |
|---|---|
| BE (1) | BE475910A (OSRAM) |
-
0
- BE BE475910D patent/BE475910A/fr unknown
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