[ Huaqiang Security Network News ] The 14 major problems of alarm knowledge 
1. What parts of the alarm system are made up of?
The simple alarm system consists of a front-end detector, an intermediate transmission section, and an alarm panel. The large alarm system can regard the detector and the alarm host as the front end part. The transmission part from the alarm host to the alarm machine is the transmission part, and the central alarm machine and the computer part are regarded as the back end part.
2. The alarm system is different according to the information transmission method. Which kinds can be divided?
According to different information transmission methods, there are two types of wired and wireless from the detector to the host. There are two types of wired and wireless devices from the host to the center. Among them, the wired system can be divided into two types based on telephone line transmission and bus-based transmission. Wireless is transmitted via GSM.
3. What types of detectors are they divided into?
According to the detection principle and working mode, it can be divided into: infrared, microwave, infrared microwave composite, vibration, smoke, gas, glass break, ultrasonic and so on. Infrared detectors can also be divided into active infrared and passive infrared, and the smoke can be divided into ionic and photoelectric.
4. How does the active infrared detector work?
The active infrared detector consists of an infrared emitter and an infrared receiver. The infrared emitter emits a beam or a majority of the modulated infrared light to the infrared receiver. The detector does not alarm when there is no obstruction between the transmitter and receiver. When an object is blocked, the receiver output signal changes and the detector alarms.
5. How does the passive infrared detector work?
There are two key components in the passive infrared detector, one is the Fresnel lens and the other is the pyroelectric sensor. Any object in the natural world above absolute temperature (-273o) will produce infrared radiation, and objects of different temperatures will emit different wavelengths of infrared energy. The human body has a constant body temperature and is different from the ambient temperature. When the human body moves, this change in the difference is detected by the pyroelectric sensor through the Fresnel lens, thereby outputting an alarm signal.
6. How does the microwave detector work?
The microwave detector uses the principle of Doppler effect. In the microwave section, when transmitting at a frequency, when the emitted microwave encounters a fixed object, the reflected microwave frequency does not change, that is, f is = f, and the detector does not emit an alarm signal. When the emitted microwave encounters a moving object, the reflected microwave frequency will change, that is, the f will be received, and the microwave detector will issue an alarm signal.
7. What is a binary infrared detector? What is a quaternary infrared detector?
A detector with two detectors that combines two pyroelectric sensors of the same performance and opposite polarity is a binary detector. A detector with four detectors that combines four pyroelectric sensors of the same performance and opposite polarity is a four-element detector.
8. What is the role of the Fresnel lens?
Fresnel lenses have multiple functions.
One is focusing to refract or reflect the pyroelectric infrared radiation onto the pyroelectric sensor.
The second is to divide the detection area into several bright areas and dark areas. When the human body moves within the detection range, it will enter the viewport of the Fresnel lens in turn, and the pyroelectric sensor will "see" the moving human body for a while and then " It is "not visible" so that the movement of the human body can produce a continuously varying signal on the pyroelectric sensor in the form of temperature changes.
The third is to filter the impurity signals caused by white light, fluorescent light, strong light, and the like.
9. What is a double detector? What are the common dual detectors on the market?
In order to overcome the defects of the single technology detector, two detectors with different technical principles are usually integrated, and the detector that only alarms when the sensors of the two detection technologies detect the movement of the human body is called a double detector. The common double detectors on the market are microwave + passive infrared.
10. What is the three detectors? What is the four detectors?
The Sanjian detector is only a gimmick promoted by some domestic manufacturers and distributors, using microprocessor technology as a detection method. In fact, this can only be counted as three technical detectors. This is all three words, then infrared microwave micro-processing anti-pet anti-masking anti-camouflage can be called six detectors? The real three detectors must have three detection techniques, such as: passive infrared + microwave + ultrasonic detector.
11. What is a vibration detector?
The vibration detector is used as an alarm basis to detect the vibration signals generated by the intruder during various sabotage activities. For example, when an intruder performs wall-breaking, drilling a hole, destroying an ATM, or a safe, it will cause these objects. Vibration. A detector that triggers an alarm with these vibration signals is called a vibration detector.
12. What is the standard output signal of the detector?
The standard output signal of the detector is a switching signal. The common one is a normally closed detector, and it can also be customized for normally open or normally open/normally closed.
13. What is temperature compensation?
In general, people's body temperature is always much higher than the ambient temperature. When the intruder moves, the sensor receives a large amplitude change signal and triggers an alarm. When the ambient temperature rises to be close to the human body temperature, the amplitude of the infrared change signal received by the intruder during the movement is small, so that it may not be alarmed because the signal is less than the trigger threshold.
Temperature compensation automatically increases the gain of the intrusion signal amplifier when the ambient temperature is close to the human body temperature, so that the signal of the external intruder can be captured without affecting the sensitivity due to the ambient temperature.
14. The classification method of the detector can be divided into: wall-mounted, ceiling-mounted and mounted according to the installation method of the detector.
According to the detection range of the detector, it can be divided into: wide-angle type, curtain type, and all-round.
The simple alarm system consists of a front-end detector, an intermediate transmission section, and an alarm panel. The large alarm system can regard the detector and the alarm host as the front end part. The transmission part from the alarm host to the alarm machine is the transmission part, and the central alarm machine and the computer part are regarded as the back end part.
2. The alarm system is different according to the information transmission method. Which kinds can be divided?
According to different information transmission methods, there are two types of wired and wireless from the detector to the host. There are two types of wired and wireless devices from the host to the center. Among them, the wired system can be divided into two types based on telephone line transmission and bus-based transmission. Wireless is transmitted via GSM.
3. What types of detectors are they divided into?
According to the detection principle and working mode, it can be divided into: infrared, microwave, infrared microwave composite, vibration, smoke, gas, glass break, ultrasonic and so on. Infrared detectors can also be divided into active infrared and passive infrared, and the smoke can be divided into ionic and photoelectric.
4. How does the active infrared detector work?
The active infrared detector consists of an infrared emitter and an infrared receiver. The infrared emitter emits a beam or a majority of the modulated infrared light to the infrared receiver. The detector does not alarm when there is no obstruction between the transmitter and receiver. When an object is blocked, the receiver output signal changes and the detector alarms.
5. How does the passive infrared detector work?
There are two key components in the passive infrared detector, one is the Fresnel lens and the other is the pyroelectric sensor. Any object in the natural world above absolute temperature (-273o) will produce infrared radiation, and objects of different temperatures will emit different wavelengths of infrared energy. The human body has a constant body temperature and is different from the ambient temperature. When the human body moves, this change in the difference is detected by the pyroelectric sensor through the Fresnel lens, thereby outputting an alarm signal.
6. How does the microwave detector work?
The microwave detector uses the principle of Doppler effect. In the microwave section, when transmitting at a frequency, when the emitted microwave encounters a fixed object, the reflected microwave frequency does not change, that is, f is = f, and the detector does not emit an alarm signal. When the emitted microwave encounters a moving object, the reflected microwave frequency will change, that is, the f will be received, and the microwave detector will issue an alarm signal.
7. What is a binary infrared detector? What is a quaternary infrared detector?
A detector with two detectors that combines two pyroelectric sensors of the same performance and opposite polarity is a binary detector. A detector with four detectors that combines four pyroelectric sensors of the same performance and opposite polarity is a four-element detector.
8. What is the role of the Fresnel lens?
Fresnel lenses have multiple functions.
One is focusing to refract or reflect the pyroelectric infrared radiation onto the pyroelectric sensor.
The second is to divide the detection area into several bright areas and dark areas. When the human body moves within the detection range, it will enter the viewport of the Fresnel lens in turn, and the pyroelectric sensor will "see" the moving human body for a while and then " It is "not visible" so that the movement of the human body can produce a continuously varying signal on the pyroelectric sensor in the form of temperature changes.
The third is to filter the impurity signals caused by white light, fluorescent light, strong light, and the like.
9. What is a double detector? What are the common dual detectors on the market?
In order to overcome the defects of the single technology detector, two detectors with different technical principles are usually integrated, and the detector that only alarms when the sensors of the two detection technologies detect the movement of the human body is called a double detector. The common double detectors on the market are microwave + passive infrared.
10. What is the three detectors? What is the four detectors?
The Sanjian detector is only a gimmick promoted by some domestic manufacturers and distributors, using microprocessor technology as a detection method. In fact, this can only be counted as three technical detectors. This is all three words, then infrared microwave micro-processing anti-pet anti-masking anti-camouflage can be called six detectors? The real three detectors must have three detection techniques, such as: passive infrared + microwave + ultrasonic detector.
11. What is a vibration detector?
The vibration detector is used as an alarm basis to detect the vibration signals generated by the intruder during various sabotage activities. For example, when an intruder performs wall-breaking, drilling a hole, destroying an ATM, or a safe, it will cause these objects. Vibration. A detector that triggers an alarm with these vibration signals is called a vibration detector.
12. What is the standard output signal of the detector?
The standard output signal of the detector is a switching signal. The common one is a normally closed detector, and it can also be customized for normally open or normally open/normally closed.
13. What is temperature compensation?
In general, people's body temperature is always much higher than the ambient temperature. When the intruder moves, the sensor receives a large amplitude change signal and triggers an alarm. When the ambient temperature rises to be close to the human body temperature, the amplitude of the infrared change signal received by the intruder during the movement is small, so that it may not be alarmed because the signal is less than the trigger threshold.
Temperature compensation automatically increases the gain of the intrusion signal amplifier when the ambient temperature is close to the human body temperature, so that the signal of the external intruder can be captured without affecting the sensitivity due to the ambient temperature.
14. The classification method of the detector can be divided into: wall-mounted, ceiling-mounted and mounted according to the installation method of the detector.
According to the detection range of the detector, it can be divided into: wide-angle type, curtain type, and all-round.
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