A security burglar alarm is a device that causes an alarm when a thief enters a defense zone. It is used to signal a dangerous situation. The security burglar alarm system is composed as follows:
1, detector
The detector usually consists of a sensor and a signal processor. Some detectors have only sensors and no signal processor.
The sensor is the core part of the detector. It is a physical quantity conversion device. In the intrusion detector, the sensor converts the measured physical quantity pressure, displacement, vibration, temperature, sound, light intensity, etc. into an easily handleable amount of electricity. Such as current, voltage, resistance, capacitance and so on.
A sensor is an energy conversion device that converts measured physical quantities (such as force, pressure, mass, stress, displacement, velocity, acceleration, vibration, shock, temperature, sound, light intensity, etc.) into corresponding, easy to accurately process The amount of electricity (such as current, voltage, resistance, inductance, capacitance, etc.). This amount of electricity is called the original electrical signal.
2. Channel
A channel is a channel through which electrical signals are detected, that is, a medium. According to the narrow and broad sense of the range of the channel, the medium that only refers to the transmitted signal is called the narrow channel I. In addition to the transmission medium, it also includes all the converters from the detector output to the input of the alarm controller ( An extended range of channels, such as transmitting devices, coded transmitters, receiving devices, etc., is referred to as a generalized channel. In the generalized channel, regardless of the intermediate process, they simply process the detected electrical signal. Just care about the results of the final transmission without having to care about the detailed process of forming this end result.
3, alarm controller
The alarm controller consists of signal processing and alarm devices. The alarm signal processing is to process the detected electrical signal transmitted from the signal, determine whether there is a condition in the electrical signal, and output a corresponding judgment signal. If the detected electrical signal contains a person invading the signal, the signal processor sends an alarm signal, and the alarm device emits an audible or optical alarm, which causes the guard to be alert. On the other hand, if the signal of the unmanned person in the electrical signal is invaded, the signal processor sends a signal without a condition, and the alarm does not emit an audible and visual alarm signal.
Usually, in order to achieve regional prevention, several communities that need to be guarded are networked to an alarm center. Once a dangerous situation occurs, they can concentrate on combating criminals. The electrical signals of the alarm controllers in each area are transmitted to the control center via telephone lines, cables, optical cables, or by radio waves. The commands or commands of the control center can also be sent back to the alarm duty room in each area to strengthen the prevention. Strength. The control center is usually located in the public security department of the city and district.
The alarm controller is usually composed of a signal processor and an alarm (ie, a display). The signal processor further processes the detected electrical signal sent by the transmission system to determine whether a dangerous condition exists. The corresponding determination electric signal is output, and the alarm is controlled. There are also alarms whose signal processing is done in the detector. After receiving the judgment electric signal that there is a dangerous situation, the alarm device converts it into an adult capable sound and bright alarm signal output, causing people to be alert, so as to take corresponding actions in time.
Verification equipment and its system, ie, sound and image verification system, because the alarm can not do absolutely false alarms, so often add TV monitoring and sound and other verification equipment to determine the real situation on the scene, to avoid the security personnel mistakes Reported and tired of running around.
The TV verification device was later developed into a video motion detector, which combined the alarm and monitoring functions to reduce the labor intensity of the surveillance personnel.
4, response strength
In response to the power (or guard force), according to the warning signal sent by the monitoring center (ie, the alarm controller), the guards quickly went to the scene of the accident, arrested the invaders, and interrupted the intrusion.
Without guard power, it cannot be counted as a complete alarm system. Each residential area shall cooperate with the police station and the joint defense team to form a regional detection center, and the monitoring center shall be equipped with the necessary security forces. At the same time, the monitoring center should keep in touch with the mobility of higher-level public security departments so that larger-scale actions can be made when necessary. As for the units, they should form their own monitoring centers according to their size and network with regional monitoring centers. Only in this way can a deterrent force be formed on the invaders.
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