CN109285305B - Doppler anti-false alarm system - Google Patents
Doppler anti-false alarm system Download PDFInfo
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- CN109285305B CN109285305B CN201811471798.2A CN201811471798A CN109285305B CN 109285305 B CN109285305 B CN 109285305B CN 201811471798 A CN201811471798 A CN 201811471798A CN 109285305 B CN109285305 B CN 109285305B
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- doppler
- false alarm
- detection
- screen body
- shielding
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- 238000001514 detection method Methods 0.000 claims abstract description 62
- 230000007123 defense Effects 0.000 claims abstract description 25
- 239000011521 glass Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 9
- 230000002265 prevention Effects 0.000 claims abstract description 4
- 238000009434 installation Methods 0.000 claims description 8
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000011835 investigation Methods 0.000 description 4
- 230000001960 triggered effect Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 230000009545 invasion Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/16—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
Abstract
A Doppler anti-false alarm system belongs to the technical field of perimeter intrusion detection of nuclear power stations. The system comprises Doppler detection equipment, an anti-riot net and an anti-false alarm device; the anti-riot net is positioned at the tail end of the detection defense area of the Doppler detection equipment, and part of detection signals overflow out of the defense area; the false alarm prevention device is arranged at the tail end of the detection defense area of the Doppler detection equipment and is arranged at the inner side of the anti-riot network; the false alarm preventing device is a device with shielding materials for shielding overflow detection signals. The invention can effectively inhibit the signal overflow at the tail end of the defense area of the Doppler equipment, and simultaneously avoid the shaking of the net sheet at the tail end of the defense area to trigger the intrusion false alarm, thereby greatly reducing the intrusion false alarm rate of the Doppler detection equipment. Meanwhile, the system adopts transparent glass, so that most electromagnetic wave signals can be reflected, the sight is not blocked, and the requirements of guidelines are met.
Description
Technical Field
The invention belongs to the technical field of perimeter intrusion detection of nuclear power stations, and particularly relates to a Doppler anti-false alarm system.
Background
In a perimeter intrusion detection system of a nuclear power plant, a doppler detection device is generally provided at a corner of the perimeter of a protection zone of the nuclear power plant or at the end of a protection zone for detection compensation. The false alarm rate of Doppler detection equipment is always high since the three-door nuclear power perimeter intrusion detection system is self-thrown. The Doppler detection device alarm statistics and analysis result: the intrusion false alarm accounts for 89.12% of the total Doppler false alarm number, and the data analysis and the field investigation show that the signal overflow at the tail end of the anti-region of the Doppler equipment is the most main reason for the high intrusion false alarm. During investigation, the problems that signals at the tail ends of the defense areas of the Doppler equipment overflow and the intrusion false alarm rate is high and the like are found in the brother power plants in China, and the problems are not solved effectively all the time. Through analysis of Doppler working principle, on-site investigation, test and data investigation, after comprehensive analysis, the main reasons for finding out signal overflow at the tail end of a Doppler equipment defense area are as follows: 1. on the premise that the installation height, the equipment parameter setting and the like meet the requirements, if the signals at the tail end of the Doppler defense area are not overflowed, dead zones are easy to generate at the tail end of the defense area, and the requirements of the guidelines are not met; 2. to effectively cover all areas to be detected by Doppler, the tail end of the defending area inevitably overflows part of microwave detection signals outside the defending area; 3. even if the signal at the tail end of the defense area does not overflow, the explosion-proof net at the tail end of the defense area is severely rocked due to the strong wind and the like in the windy weather, and the Doppler false alarm is triggered. Therefore, a device needs to be developed to solve the problem that the signal at the tail end of the defense area overflows and the mesh sways to trigger intrusion alarm. .
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the Doppler anti-region anti-false alarm system capable of inhibiting the signal overflow at the tail end of the Doppler anti-region and preventing the mesh from shaking to trigger the invasion false alarm, so that the Doppler equipment is ensured to effectively cover all areas needing to be detected and not overflow to the outside of the anti-region, and the false alarm is triggered.
The invention is realized by the following technical scheme:
the invention relates to a Doppler anti-false alarm system, which comprises Doppler detection equipment, an anti-riot net and an anti-false alarm device; the anti-riot net is positioned at the tail end of the detection defense area of the Doppler detection equipment, and part of detection signals overflow out of the defense area; the false alarm prevention device is arranged at the tail end of the detection defense area of the Doppler detection equipment and is arranged at the inner side of the anti-riot network; the false alarm preventing device is a device with shielding materials for shielding overflow detection signals.
Preferably, the false alarm preventing device is a shielding screen with shielding material for shielding the overflow detection signal.
Preferably, the shielding screen comprises a screen body and a supporting frame for supporting the screen body.
Preferably, the screen body is made of shielding glass.
Preferably, the screen body is formed by embedding two pieces of shielding glass in a Chinese character 'ri' shaped frame.
Preferably, the frame is an aluminum alloy frame.
Preferably, the screen body is supported by the support frame to stand on the end of the detection area of the doppler detection device.
Preferably, the bottom end of the screen body is placed on the ground.
Preferably, the support frame comprises a ground support part and a screen body support part; the screen body support is inclined with respect to the screen body.
Preferably, the height of the screen body is equal to the Doppler detection diameter/2+ Doppler detection device installation height.
The invention has the following beneficial effects:
the Doppler anti-false alarm system can effectively inhibit signal overflow at the tail end of the Doppler equipment anti-zone, and meanwhile, prevent the net piece at the tail end of the anti-zone from shaking to trigger intrusion false alarm, thereby greatly reducing the intrusion false alarm rate of the Doppler detection equipment. Meanwhile, the system adopts transparent glass, so that most electromagnetic wave signals can be reflected, the sight is not blocked, and the requirements of guidelines are met.
Drawings
Figure 1 is a diagram illustrating the working principle of a conventional doppler detection device;
FIG. 2 is a system block diagram of a Doppler defense area anti-false alarm system of the present invention;
fig. 3 is a schematic structural diagram of the anti-false alarm device in fig. 2.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
As can be seen from the working schematic diagram of the doppler detection device in fig. 1, signals easily overflow to the outside of the anti-riot network at the end of the anti-riot area, so that intrusion false alarms are triggered when someone or a vehicle passes through the outside of the anti-riot network. In response to this problem, a Doppler defense area anti-false alarm system is presented herein.
Referring to fig. 2, a doppler defending area anti-false alarm system comprises a doppler detection device 3, an anti-riot net 6 (refer to fig. 1), and an anti-false alarm device 11. The anti-riot net 6 is located at the end of the defending area 4 detected by the Doppler detection device 3, and part of the detection signal overflows outside the defending area. In order to effectively cover all areas to be detected, it is necessary to have some of the detection signal spill out of the area of defense (reference numeral 5 in the figure shows doppler signals that spill out of the anti-riot net at the end of the area of defense), otherwise detection dead zones would result. The false alarm preventing device 11 is arranged at the tail end of the anti-riot area 4 detected by the Doppler detection equipment 3 and is arranged at the inner side of the anti-riot net 6. The false alarm device 11 is a device with shielding material for shielding the overflow detection signal. When the signal overflows, the anti-false alarm device 11 reflects the overflowed signal (the signal shielded and reflected by the anti-false alarm device is shown in fig. 2), so that the power density of the signal penetrating to the outer side of the anti-riot net 6 is reduced, and the intrusion false alarm is not triggered when a person or a vehicle passes through the outer side of the anti-riot net at the tail end of the anti-riot area; when strong wind weather, the net piece of the anti-riot net 6 at the tail end of the anti-riot area 4 shakes, but because the anti-false alarm device 11 is arranged on the inner side of the anti-riot net 6, signals are restrained, the net piece shakes and can not trigger false alarms, and meanwhile, the reinforced anti-false alarm device can not shake and trigger false alarms in strong wind weather.
The Doppler detection device 3 is arranged on the installation upright post 1, and the installation upright post 1 is arranged on the installation base 2. The Doppler detection device 3 emits detection signals, and a signal coverage area is a detection defense area.
The false alarm device may be a shield screen having a shielding material shielding the overflow detection signal. As shown in fig. 3 (the left side of fig. 3 is a front view of the false alarm preventing device, and the right side is a side view of the false alarm preventing device), the shield screen includes a screen body 13 and a supporting frame 14 for supporting the screen body 13. The screen body 13 is supported by the support frame 14 to stand on the end of the Doppler detection device detection zone 4. The bottom end of the screen body 13 is arranged on the ground.
The screen body height of the shielding screen is determined according to the Doppler detection equipment installation height. The first table shows a shield screen device size table.
Meter-shielding screen device size meter
The height H of the screen body in the table is calculated as follows: height h=doppler detection diameter R/2+doppler detection device mounting height H of the screen body. In the example shown above, the field Doppler detection device has an installation height h of 0.8m.
In order to ensure the suppression effect on overflow signals, the shielding screen body is set to be a certain thickness of about 5mm.
As shown in fig. 3, the support frame 14 includes a ground support portion 141 and a screen body support portion 142. The screen body support 142 is inclined with respect to the screen body 13. In order to ensure the wind resistance, the support frame adopts a stainless steel diagonal brace 9, a screen body supporting part 142 and a screen body 13 of the support frame form a triangle with an included angle of 20 degrees to be fixed, and an expansion screw with a diameter of 10mm is adopted to fix a ground supporting part 141 of the stainless steel diagonal brace 9 and the ground.
By utilizing the characteristics of microwaves (electromagnetic waves with the wavelength of about 1 to 0.1m (corresponding to the frequency of about 300MHz to 300 GHz): penetration, reflection and absorption, inhibits Doppler signals on the inner side of an anti-riot net at the tail end of an anti-riot area, signal strength exceeding 20 mu w/cm for preventing it from overflowing to outside of antiriot net 2 . By utilizing the microwave reflection characteristic, the shielding glass can effectively inhibit signal overflow through the comparison of various shielding materials, and meanwhile, the transparency characteristic of the shielding glass meets the requirements of nuclear safety guidelines, and finally, the shielding glass is selected as a shielding screen. The screen body 13 is made of shielding glass. Because the area of a whole glass is too large, the wind resistance level is reduced. For this purpose, the screen body 13 is formed by embedding two pieces of shielding glass 7 in the Chinese character 'ri' shaped frame 8. The solar-shaped frame is an aluminum alloy frame, and the shielding glass is subjected to edge wrapping treatment.
The method of adding shielding materials inside the anti-riot net at the tail end of the Doppler anti-riot area according to the reflection characteristics of the microwaves reflects most electromagnetic wave signals, so that the power density of Doppler detection signals penetrating outside the anti-riot area is greatly reduced. The shielding glass is installed on the inner side of the anti-riot net at the tail end of the anti-riot area through the stainless steel support and clings to the anti-riot net, and the shielding glass has a strong wind resistance level, so that the net piece of the anti-riot net at the tail end of the anti-riot area in windy weather can not trigger invasion.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are by way of example only and are not limiting. The objects of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been shown and described in the examples and embodiments of the invention may be modified or practiced without departing from the principles described.
Claims (7)
1. The Doppler anti-false alarm system is characterized by comprising Doppler detection equipment, an anti-riot net and an anti-false alarm device; the anti-riot net is positioned at the tail end of the detection defense area of the Doppler detection equipment, and part of detection signals overflow out of the defense area; the false alarm prevention device is arranged at the tail end of the detection defense area of the Doppler detection equipment and is arranged at the inner side of the anti-riot network; the false alarm preventing device is a device with shielding materials for shielding overflow detection signals; the false alarm preventing device is a shielding screen with shielding materials for shielding overflow detection signals; the shielding screen comprises a screen body and a supporting frame for supporting the screen body; the height of the screen body is equal to the Doppler detection diameter/2+ Doppler detection equipment installation height.
2. The doppler cell anti-false alarm system of claim 1, wherein the screen body is made of shielding glass.
3. The doppler area protection false alarm system of claim 2, wherein the screen body is formed by embedding two pieces of shielding glass in a frame in a shape of a Chinese character ri.
4. A doppler cell anti-false alarm system according to claim 3 wherein the frame is an aluminum alloy frame.
5. A doppler cell false alarm prevention system as claimed in claim 1 wherein the screen body is supported by the support frame to stand at the end of the doppler detection cell.
6. The doppler cell defense system of claim 5 wherein the bottom end of the screen body is positioned on the ground.
7. The doppler cell defense system of claim 5 wherein the support frame comprises a ground support and a screen body support; the screen body support is inclined with respect to the screen body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811471798.2A CN109285305B (en) | 2018-12-04 | 2018-12-04 | Doppler anti-false alarm system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811471798.2A CN109285305B (en) | 2018-12-04 | 2018-12-04 | Doppler anti-false alarm system |
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| Publication Number | Publication Date |
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| CN109285305A CN109285305A (en) | 2019-01-29 |
| CN109285305B true CN109285305B (en) | 2024-04-09 |
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| CN201811471798.2A Active CN109285305B (en) | 2018-12-04 | 2018-12-04 | Doppler anti-false alarm system |
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| CN (1) | CN109285305B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3947834A (en) * | 1974-04-30 | 1976-03-30 | E-Systems, Inc. | Doppler perimeter intrusion alarm system using a leaky waveguide |
| JPH01169600A (en) * | 1987-12-10 | 1989-07-04 | Karl Harms Handels Gmbh & Co Kg | Magnetic burglary/invasion preventing system and metalic sensor element suitable therefor |
| GB201105734D0 (en) * | 2010-04-06 | 2011-05-18 | Orb Information Technology Ltd | A passive device shield with proximity change alert |
| CN102289906A (en) * | 2011-06-09 | 2011-12-21 | 无锡国科微纳传感网科技有限公司 | Enclosure intrusion detection method, device and system |
| CN202624208U (en) * | 2012-04-28 | 2012-12-26 | 上海工程技术大学 | Person-clamping-preventing monitoring system of metro platform shielding door |
| CN105205960A (en) * | 2015-10-15 | 2015-12-30 | 北京航天易联科技发展有限公司 | Optical fiber perimeter intrusion alarm system |
| CN207235356U (en) * | 2017-09-15 | 2018-04-13 | 重庆百川科技发展有限公司 | A kind of composite protective plate with electro-magnetic screen function |
| CN209070674U (en) * | 2018-12-04 | 2019-07-05 | 三门核电有限公司 | A kind of Doppler defence area false alarm prevention system |
-
2018
- 2018-12-04 CN CN201811471798.2A patent/CN109285305B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3947834A (en) * | 1974-04-30 | 1976-03-30 | E-Systems, Inc. | Doppler perimeter intrusion alarm system using a leaky waveguide |
| JPH01169600A (en) * | 1987-12-10 | 1989-07-04 | Karl Harms Handels Gmbh & Co Kg | Magnetic burglary/invasion preventing system and metalic sensor element suitable therefor |
| GB201105734D0 (en) * | 2010-04-06 | 2011-05-18 | Orb Information Technology Ltd | A passive device shield with proximity change alert |
| CN102289906A (en) * | 2011-06-09 | 2011-12-21 | 无锡国科微纳传感网科技有限公司 | Enclosure intrusion detection method, device and system |
| CN202624208U (en) * | 2012-04-28 | 2012-12-26 | 上海工程技术大学 | Person-clamping-preventing monitoring system of metro platform shielding door |
| CN105205960A (en) * | 2015-10-15 | 2015-12-30 | 北京航天易联科技发展有限公司 | Optical fiber perimeter intrusion alarm system |
| CN207235356U (en) * | 2017-09-15 | 2018-04-13 | 重庆百川科技发展有限公司 | A kind of composite protective plate with electro-magnetic screen function |
| CN209070674U (en) * | 2018-12-04 | 2019-07-05 | 三门核电有限公司 | A kind of Doppler defence area false alarm prevention system |
Non-Patent Citations (1)
| Title |
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| "基于物联网的周界入侵探测技术引入核电工程的可行性研究";伍文飞, 李爽, 张继伟;《仪器仪表用户》;20161031(第第10期期);82-88 * |
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| CN109285305A (en) | 2019-01-29 |
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