At present, the more popular front-end alarm equipment is usually composed of an alarm host, various types of detectors, remote controllers, etc., and has common functions such as on-site alarm, dial alarm, and zone alarm, and some extended functions.
Alarm host
The alarm host is the core of the front-end alarm system. It is used to receive the alarm signal sent by the detector and provide timely feedback. After the alarm host receives the alarm signal, it will generate a high-decibel alarm sound and will use the telecommunication network to answer the alarm. The center transmits all kinds of police information, or dials multiple sets of alarm calls set by the owner himself.
According to the detector signal transmission method, the alarm host can be divided into wired alarm host and wireless alarm host. That is, after the detector detects an illegal intruder, the alarm signal is transmitted to the alarm host in two ways. The wireless detector transmits an alarm signal by sending electromagnetic waves of a certain frequency, and the wired detector can use the switching signal output or electricity respectively. Flat signal output.
The wired alarm host has the advantages of reliable communication, strong anti-interference ability and low device cost. It is suitable for buildings that can be reserved for connecting cables in the wall; however, it has poor mobility and inconveniences to meet the changing requirements of users and products. It is difficult and costly to maintain and replace reserved cables. The wireless alarm host can prevent the connection between the detector and the host from influencing the interior decoration, and has the advantages of flexibility and conciseness. However, it also has the disadvantages of being easily interfered with by various external factors and relatively high device costs. Therefore, in the selection of the alarm host, it is necessary to take into consideration various factors such as the prevention site, building area, structural characteristics, property value, and the surrounding environment.
2. Detector
There are many kinds of detectors, and corresponding detectors are used according to the actual environment. The main detectors include door magnetism, smoke, active infrared, passive infrared, microwave, vibration intrusion, sound control, and infrasonic glass crushers, as well as several types of technologies. Used detectors. Each of these detectors has its own features and meets the needs of consumers. However, if the scope of application and technical compatibility, the most popular market is currently passive infrared detectors. Passive infrared detectors rely on the body to passively absorb animal activity.
Discharged by infrared thermal energy to alarm, also known as pyroelectric infrared detectors, the detector itself does not emit infrared. In nature, at any temperature higher than the absolute temperature (-273 degrees), the object will produce an infrared spectrum. At different temperatures, the wavelength of the released infrared energy is not the same, so the infrared wavelength is related to the temperature. .
There are two key components in the PIR detector. One is the pyroelectric infrared sensor (PIR). It can convert the infrared signal with a wavelength of 8-12um into an electrical signal and can be used in nature. The white light signal has an inhibitory effect. In the vigilance zone of the PIR detector, the pyroelectric infrared sensor senses only the background temperature when there is no body movement. When the human body enters the warning zone, the pyroelectric infrared sensor senses through the Fresnel lens. The difference between the human body temperature and the background temperature is the signal. Therefore, the basic concept of the infrared detection by the infrared detector is to sense the temperature difference between the moving object and the background object. Another device is the Fresnel lens, Fresnel lens has two forms, namely refractive and reflective. The Fresnel lens has two functions: one is focusing, that is, the infrared signal of pyro is refraction (reflection) on the PIR. The second role is to divide the vigilance area into several bright and dark areas so as to enter the alert. The moving object in the area can generate a change pyro-infrared signal on the PIR in the form of a temperature change, so that the PIR can generate a changing electrical signal.
3. Remote control/operating keyboard
The remote controller is to set the working state of the alarm host, such as arming, disarming, partial defense, and emergency assistance for the host through different buttons on the remote controller.
Alarm host
The alarm host is the core of the front-end alarm system. It is used to receive the alarm signal sent by the detector and provide timely feedback. After the alarm host receives the alarm signal, it will generate a high-decibel alarm sound and will use the telecommunication network to answer the alarm. The center transmits all kinds of police information, or dials multiple sets of alarm calls set by the owner himself.
According to the detector signal transmission method, the alarm host can be divided into wired alarm host and wireless alarm host. That is, after the detector detects an illegal intruder, the alarm signal is transmitted to the alarm host in two ways. The wireless detector transmits an alarm signal by sending electromagnetic waves of a certain frequency, and the wired detector can use the switching signal output or electricity respectively. Flat signal output.
The wired alarm host has the advantages of reliable communication, strong anti-interference ability and low device cost. It is suitable for buildings that can be reserved for connecting cables in the wall; however, it has poor mobility and inconveniences to meet the changing requirements of users and products. It is difficult and costly to maintain and replace reserved cables. The wireless alarm host can prevent the connection between the detector and the host from influencing the interior decoration, and has the advantages of flexibility and conciseness. However, it also has the disadvantages of being easily interfered with by various external factors and relatively high device costs. Therefore, in the selection of the alarm host, it is necessary to take into consideration various factors such as the prevention site, building area, structural characteristics, property value, and the surrounding environment.
2. Detector
There are many kinds of detectors, and corresponding detectors are used according to the actual environment. The main detectors include door magnetism, smoke, active infrared, passive infrared, microwave, vibration intrusion, sound control, and infrasonic glass crushers, as well as several types of technologies. Used detectors. Each of these detectors has its own features and meets the needs of consumers. However, if the scope of application and technical compatibility, the most popular market is currently passive infrared detectors. Passive infrared detectors rely on the body to passively absorb animal activity.
Discharged by infrared thermal energy to alarm, also known as pyroelectric infrared detectors, the detector itself does not emit infrared. In nature, at any temperature higher than the absolute temperature (-273 degrees), the object will produce an infrared spectrum. At different temperatures, the wavelength of the released infrared energy is not the same, so the infrared wavelength is related to the temperature. .
There are two key components in the PIR detector. One is the pyroelectric infrared sensor (PIR). It can convert the infrared signal with a wavelength of 8-12um into an electrical signal and can be used in nature. The white light signal has an inhibitory effect. In the vigilance zone of the PIR detector, the pyroelectric infrared sensor senses only the background temperature when there is no body movement. When the human body enters the warning zone, the pyroelectric infrared sensor senses through the Fresnel lens. The difference between the human body temperature and the background temperature is the signal. Therefore, the basic concept of the infrared detection by the infrared detector is to sense the temperature difference between the moving object and the background object. Another device is the Fresnel lens, Fresnel lens has two forms, namely refractive and reflective. The Fresnel lens has two functions: one is focusing, that is, the infrared signal of pyro is refraction (reflection) on the PIR. The second role is to divide the vigilance area into several bright and dark areas so as to enter the alert. The moving object in the area can generate a change pyro-infrared signal on the PIR in the form of a temperature change, so that the PIR can generate a changing electrical signal.
3. Remote control/operating keyboard
The remote controller is to set the working state of the alarm host, such as arming, disarming, partial defense, and emergency assistance for the host through different buttons on the remote controller.
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