Dead Angle and Blind Zone Affecting the Reliability of Household Alarm

Home security system setting, operation troubleshooting. Help installing wireless wired home security system.
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vedard
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Dead Angle and Blind Zone Affecting the Reliability of Household Alarm

Post by vedard » Thu Feb 21, 2019 3:21 am

Burglary and robbery may occur at any time and in any country. It not only seriously endangers people's property and life security, but also is a social security problem that is difficult to solve thoroughly. Although organs, enterprises and institutions can send people on duty, install video surveillance and alarm emergency devices to prevent the crime, but there will still be some cases of theft and robbery.
For the general public, there is also a certain sense of prevention. For example, early anti-theft nets and anti-theft windows have a certain security effect on the home, but in actual use, they expose many hidden dangers, affecting the city appearance, hindering fire escape, providing favorable conditions for thieves to climb and steal neighbors, and causing civil disputes of rust falling and injuring people, etc.
With the development of science and technology, there are many video surveillance and intelligent anti-theft and alarm electronic products on the market, which provide favorable conditions for security prevention and rapid cracking of cases. Because human pyroelectricity, microwave and gate magnetism are widely used as detectors, alarm trigger signals can be obtained from their unique properties of small changes in physical quantities. However, some blind areas or dead corners, changes in the external natural environment, as well as the limitations of some physical properties of detectors, will bury hidden dangers of false alarm or missed alarm.
In order to develop the market rapidly and extensively, the manufacturers of alarm devices design large size open-ended alarm detectors to facilitate users to install themselves, which provides the conditions for thieves to destroy targets or counter-alarm actions, leaving a crime space in the gap between open-ended and anti-alarm, which seems to be clothing, but is virtual.
Therefore, we should not only summarize the problems existing in the security alarm market, but also study the social structure of the population in the period of highly developed economy and science and technology. When the Gini coefficient of the gap between the rich and the poor exceeds the internationally recognized security police line, some people take theft and robbery as their profession calmly because of the psychological imbalance of some people, the increase of the floating population and the forced excuse of life. But go, after leaving prison, resume the old business - gang, commit crimes frequently.
In people's normal life, although the number of thieves who steal or rob is very small, the number of people who encounter theft is also small, but the consequences caused by this cause serious harm to society. Therefore, we should pay attention to the installation and use of monitoring and security telephone alarm.
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vedard
Posts: 303
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Re: Dead Angle and Blind Zone Affecting the Reliability of Household Alarm

Post by vedard » Thu Feb 21, 2019 3:25 am

At present, the wireless intelligent alarms sold on the markets have many functions, wide monitoring and high intelligence, but they are expensive and visibly installed. They not only have poor Anti-alarm and anti-damage ability, but also have complicated and inconvenient operation. Many wireless intelligent alarms are using fixed transmitting and receiving frequency, fixed size and fixed operation mode. That is with dangers of destruction.
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vedard
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Re: Dead Angle and Blind Zone Affecting the Reliability of Household Alarm

Post by vedard » Thu Feb 21, 2019 3:27 am

Some wireless intelligent alarms use human pyroelectric infrared or microwave sensors. They can set up dozens of defense zones and dozens of alarm telephones. They are highly intelligent and connected with the community for system management. Although these products are highly intelligent, it is undeniable that their performance is flawed or even inadequate. Pyroelectric sensors may cause false alarm for the near high thermal intensity light and hot air flow. When the relative temperature of the environment is close to the human body's temperature, they may miss the alarm. They are not sensitive to the moving human body covered by glass and plate. At the end of last century, the robbery of cultural relics in Kaifeng Museum in the Northern Song Dynasty happened within the monitoring range of human pyroelectric infrared burglar alarm. Microwave detectors use Doppler frequency shift characteristics to monitor the moving objects in the defense area. When someone enters the defense area, they will give an alarm immediately. However, animals and plants in the defense area may cause false alarms. Microwave can penetrate walls and floors. If it is not installed properly, the activities of neighbors next door may also cause false alarm. Any intelligent alarm will affect the credibility of consumers and reduce the sense of security as long as there are false or missed reports.
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vedard
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Re: Dead Angle and Blind Zone Affecting the Reliability of Household Alarm

Post by vedard » Thu Feb 21, 2019 3:28 am

It is safer to use the door magnet as the detector, and it is impossible to miss or misreport, because the alarm signal is generated by the external force of the door and window when the crime is committed. No crime behavior will not produce alarm trigger signal, but the volume is large, and belongs to open clothes, vulnerable to hidden damage or Anti-alarm behavior control. If an acquaintance commits a crime, this kind of thing is more likely to happen.
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vedard
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Re: Dead Angle and Blind Zone Affecting the Reliability of Household Alarm

Post by vedard » Thu Feb 21, 2019 3:29 am

Nowadays, the dual-detector alarm is introduced on the market, which combines human pyroelectric infrared detection and microwave detection in the same group of detectors. It makes use of the performance of microwave not being shielded and insensitive to smoke, light and temperature changes, and complements the shortcomings of human pyroelectric infrared detectors. Through the combined detection of two units, the false alarm can basically be eliminated. However, this may lose sight of one another, because the human body infrared radiation is easily shielded by walls, furniture, panels, glass and so on. The dual detector can not trigger the alarm until both units detect the intrusion at the same time. If a burglar with Anti-alarm experience enters the defense area under the cover of glass and sheet metal, it is difficult to trigger the alarm with the function of double-alarm detection only with single-alarm. Under the function of anti-alarm, is it not "alarm without alarm"?
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BarryCat
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Dead Angle and Blind Zone Affecting the Reliability of Household Alarm

Post by BarryCat » Fri Jul 05, 2019 7:01 am

I have looked at local suppliers of Paradox, but the kits shown are so many and dont contain that which you might want. What sort of price would you pay for a wireless system of say 10 zones with IR detectors?

vedard
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Re: Dead Angle and Blind Zone Affecting the Reliability of Household Alarm

Post by vedard » Fri Jul 05, 2019 7:47 am

BarryCat wrote:
Fri Jul 05, 2019 7:01 am
I have looked at local suppliers of Paradox, but the kits shown are so many and dont contain that which you might want. What sort of price would you pay for a wireless system of say 10 zones with IR detectors?
For normal IR detector, around USD10 each, so 10 IR detectors are USD100, wireless GSM alarm panel 32 zones at USD110. So, total USD210
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ImogenedaP
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Dead Angle and Blind Zone Affecting the Reliability of Household Alarm

Post by ImogenedaP » Mon Oct 21, 2019 5:34 am

the bitwriter tests the alarm itself.

If he can program another remote and all works normal the remote was the problem, however if the new remote wont program a bitwriter will be required in order to test your alarm.
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