16 cold knowledge about burglar alarm detectors:
1. What is an anti-theft alarm system?
The anti-theft alarm system is a system that uses the detectors of various functions to protect the perimeter of the house, space, environment and people.
2. What is a detector?
Detectors use sensors to sense various physical changes, chemical changes in the current, pulse and other signals to promote the radio frequency circuit emits an alarm signal.
3, anti-theft host role and working methods The host is the core of the system. It is used to receive the alarm signal sent by the detector at the same time and timely feedback; host receives a warning signal, it will generate a high decibel alarm sound, and will use the telecommunication network to dial out the alarm set by the owner phone.
4. Passive infrared anti-theft detectors Passive infrared detectors rely on the infrared heat energy emitted by the passive absorption of thermal energy in animals, and are also called pyroelectric infrared probes. The detector itself does not emit infrared light.
5, the basic concept of infrared detection of passive infrared detectors in the alert range, why people can move the passive infrared detector alarm signal?
In nature, any object higher than the absolute temperature (-273 degrees) will produce an infrared spectrum. At different temperatures, the wavelength of the infrared energy released 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 between 8 and 12um into an electrical signal and can be used in nature. The white light signal has an inhibitory effect. Therefore, in the vigilance zone of the passive infrared detector, the pyroelectric infrared sensor senses only the background temperature when there is no human body moving. When the human body enters the vigilance area, it passes through the Fresnel lens and heats. The infrared sensor senses the difference between human body temperature and background temperature. Therefore, the basic concept of infrared detection by an infrared detector is to sense the difference in temperature between a moving object and a 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 changes in the PIR on the PIR in the form of temperature changes, so that the PIR can produce a changing electrical signal. 6. What is the detection range?
The detection range refers to the sensing range of the normal operation of the detector, that is, the detector can detect the movement of all objects within this range to generate an alarm state.
Infrared detector installation considerations 7, what is the launch distance?
The longest distance that the wireless device in the alarm system transmits the wireless alarm signal as an electromagnetic wave after being triggered.
8, what is the detection distance?
The maximum distance that the detector can detect in normal operation.
9. What is the sensitivity of the sensor?
When the detector is triggered by the alarm, the detection distance is far and near, the response speed is fast, the sensitivity is high, and it can be detected at a very long distance from the detector. When the sensitivity of the detector is low, only a closer range can be detected.
10. Precautions for installation of passive infrared detectors As passive infrared detectors belong to a weak signal detection device, attention must be paid to some details such as height, sensitivity, etc. in the installation. Correct installation of a passive infrared detector, you must master the following aspects of information: First, the performance characteristics of the detector must be understood, and secondly, a reasonable position to determine the installation, and finally must be carefully adjusted. It cannot be said that the detector can be alarmed to indicate that it is installed. How to determine the installation position of a passive infrared detector?
According to the instructions to determine the normal installation angle The installation height is not arbitrary, it will affect the sensitivity of the detector and the effect of preventing pets. Imagine a detector mounted at a height of 2M and a height of 2.5. When the moving object moves from the ground, the frequency of cutting the bright area and the dark area is different.
Should not face the glass doors and windows Passive infrared detectors are facing the glass doors and windows, there will be two problems: First, white light interference, apparently PIR has a strong suppression of white light, but after all, is not 100% inhibition. So avoid facing the glass doors and windows, you can avoid strong light interference. The second is to avoid complex environmental disturbances outside doors and windows, such as crowd movements and vehicles.
It is unfavorable that the passive infrared detectors of cold and hot vents or cold and heat sources have a close relationship with the change of temperature. Hot and cold vents and cold and hot sources may cause false alarms. For some low-performance detectors, air convection through windows and doors sometimes causes false alarms.
Objects that are prone to swinging on objects that are easy to swing will make microwave detectors work, and therefore may also cause false alarms. Therefore pay attention to the illegal invasion route. The purpose of installing the detector is to prevent criminals from illegally entering the country. Before determining the installation location, the main population of the building must be considered. In fact, we have prevented entrances and exits and intercepted illegal intrusions. This has achieved our goal.
The difference between wired anti-theft and wireless anti-theft 11, what is wired and wireless?
According to the alarm signal transmission method: wired type and wireless type. 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 through a certain frequency of electromagnetic waves, and the wired detector is divided into a switch signal output and a level signal. Output.
12. The active infrared detector and anti-theft detector automatically emits infrared rays from the transmitting end, and receives infrared rays from the receiving end to form an infrared network. The detector can actively guard against intruders and will not generate false alarms due to the crossing of pets or the impact of climate, thereby minimizing the false alarm rate.
13, the difference between wired anti-theft and wireless anti-theft advantages and disadvantages of cable products Advantages: Because it is dedicated dedicated, so the alarm signal transmission is relatively stable, not easily affected by external factors.
Disadvantages: The impact is beautiful, the construction workload is large, the operation is complicated, the maintenance is inconvenient, and special personnel are required to maintain it.
Advantages and disadvantages of wireless products Advantages: Do not damage the overall appearance of the prevention area, the installation is simple, easy to operate, the elderly, children will learn.
Disadvantages: The alarm signal can be disturbed by external factors, resulting in attenuation of the transmission distance of the alarm signal.
14. What is a magnetic detector and how does it work?
The door magnetic detector is used to sense the opening and closing of doors and windows. There are usually wooden door magnetic, window magnetic, shutter door magnetic, iron door magnetic. The principle is to use a magnet to control the principle of controlling the opening and closing of the magnetron. When the two are close together, the magnetron is in a closed state. At this time, the magnetron will be disconnected when the two are separated, and the signal will be disconnected. Trigger the RF circuit to send a wireless alarm signal to the control panel.
15. What is a smoke detector? How does it work?
Smoke detectors are used in homes, offices, and businesses. Early warning of the fire smoke that occurred on the scene was issued in time to prevent any possible accidents. It is generally divided into ionized smoke and photoelectric smoke. The principle of ionized smoke is to use the principle that the voltage between electrodes will change when there is smoke particles between the electrodes.
16. What is a gas detector and how does it work?
Mainly installed in the kitchen, to effectively prevent the leakage of gas endangering the owner's life, when the sensor at the front end detects the gas, the temperature will change, and the process of the change is triggered by the processing circuit into a control signal to trigger an alarm signal.
1. What is an anti-theft alarm system?
The anti-theft alarm system is a system that uses the detectors of various functions to protect the perimeter of the house, space, environment and people.
2. What is a detector?
Detectors use sensors to sense various physical changes, chemical changes in the current, pulse and other signals to promote the radio frequency circuit emits an alarm signal.
3, anti-theft host role and working methods The host is the core of the system. It is used to receive the alarm signal sent by the detector at the same time and timely feedback; host receives a warning signal, it will generate a high decibel alarm sound, and will use the telecommunication network to dial out the alarm set by the owner phone.
4. Passive infrared anti-theft detectors Passive infrared detectors rely on the infrared heat energy emitted by the passive absorption of thermal energy in animals, and are also called pyroelectric infrared probes. The detector itself does not emit infrared light.
5, the basic concept of infrared detection of passive infrared detectors in the alert range, why people can move the passive infrared detector alarm signal?
In nature, any object higher than the absolute temperature (-273 degrees) will produce an infrared spectrum. At different temperatures, the wavelength of the infrared energy released 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 between 8 and 12um into an electrical signal and can be used in nature. The white light signal has an inhibitory effect. Therefore, in the vigilance zone of the passive infrared detector, the pyroelectric infrared sensor senses only the background temperature when there is no human body moving. When the human body enters the vigilance area, it passes through the Fresnel lens and heats. The infrared sensor senses the difference between human body temperature and background temperature. Therefore, the basic concept of infrared detection by an infrared detector is to sense the difference in temperature between a moving object and a 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 changes in the PIR on the PIR in the form of temperature changes, so that the PIR can produce a changing electrical signal. 6. What is the detection range?
The detection range refers to the sensing range of the normal operation of the detector, that is, the detector can detect the movement of all objects within this range to generate an alarm state.
Infrared detector installation considerations 7, what is the launch distance?
The longest distance that the wireless device in the alarm system transmits the wireless alarm signal as an electromagnetic wave after being triggered.
8, what is the detection distance?
The maximum distance that the detector can detect in normal operation.
9. What is the sensitivity of the sensor?
When the detector is triggered by the alarm, the detection distance is far and near, the response speed is fast, the sensitivity is high, and it can be detected at a very long distance from the detector. When the sensitivity of the detector is low, only a closer range can be detected.
10. Precautions for installation of passive infrared detectors As passive infrared detectors belong to a weak signal detection device, attention must be paid to some details such as height, sensitivity, etc. in the installation. Correct installation of a passive infrared detector, you must master the following aspects of information: First, the performance characteristics of the detector must be understood, and secondly, a reasonable position to determine the installation, and finally must be carefully adjusted. It cannot be said that the detector can be alarmed to indicate that it is installed. How to determine the installation position of a passive infrared detector?
According to the instructions to determine the normal installation angle The installation height is not arbitrary, it will affect the sensitivity of the detector and the effect of preventing pets. Imagine a detector mounted at a height of 2M and a height of 2.5. When the moving object moves from the ground, the frequency of cutting the bright area and the dark area is different.
Should not face the glass doors and windows Passive infrared detectors are facing the glass doors and windows, there will be two problems: First, white light interference, apparently PIR has a strong suppression of white light, but after all, is not 100% inhibition. So avoid facing the glass doors and windows, you can avoid strong light interference. The second is to avoid complex environmental disturbances outside doors and windows, such as crowd movements and vehicles.
It is unfavorable that the passive infrared detectors of cold and hot vents or cold and heat sources have a close relationship with the change of temperature. Hot and cold vents and cold and hot sources may cause false alarms. For some low-performance detectors, air convection through windows and doors sometimes causes false alarms.
Objects that are prone to swinging on objects that are easy to swing will make microwave detectors work, and therefore may also cause false alarms. Therefore pay attention to the illegal invasion route. The purpose of installing the detector is to prevent criminals from illegally entering the country. Before determining the installation location, the main population of the building must be considered. In fact, we have prevented entrances and exits and intercepted illegal intrusions. This has achieved our goal.
The difference between wired anti-theft and wireless anti-theft 11, what is wired and wireless?
According to the alarm signal transmission method: wired type and wireless type. 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 through a certain frequency of electromagnetic waves, and the wired detector is divided into a switch signal output and a level signal. Output.
12. The active infrared detector and anti-theft detector automatically emits infrared rays from the transmitting end, and receives infrared rays from the receiving end to form an infrared network. The detector can actively guard against intruders and will not generate false alarms due to the crossing of pets or the impact of climate, thereby minimizing the false alarm rate.
13, the difference between wired anti-theft and wireless anti-theft advantages and disadvantages of cable products Advantages: Because it is dedicated dedicated, so the alarm signal transmission is relatively stable, not easily affected by external factors.
Disadvantages: The impact is beautiful, the construction workload is large, the operation is complicated, the maintenance is inconvenient, and special personnel are required to maintain it.
Advantages and disadvantages of wireless products Advantages: Do not damage the overall appearance of the prevention area, the installation is simple, easy to operate, the elderly, children will learn.
Disadvantages: The alarm signal can be disturbed by external factors, resulting in attenuation of the transmission distance of the alarm signal.
14. What is a magnetic detector and how does it work?
The door magnetic detector is used to sense the opening and closing of doors and windows. There are usually wooden door magnetic, window magnetic, shutter door magnetic, iron door magnetic. The principle is to use a magnet to control the principle of controlling the opening and closing of the magnetron. When the two are close together, the magnetron is in a closed state. At this time, the magnetron will be disconnected when the two are separated, and the signal will be disconnected. Trigger the RF circuit to send a wireless alarm signal to the control panel.
15. What is a smoke detector? How does it work?
Smoke detectors are used in homes, offices, and businesses. Early warning of the fire smoke that occurred on the scene was issued in time to prevent any possible accidents. It is generally divided into ionized smoke and photoelectric smoke. The principle of ionized smoke is to use the principle that the voltage between electrodes will change when there is smoke particles between the electrodes.
16. What is a gas detector and how does it work?
Mainly installed in the kitchen, to effectively prevent the leakage of gas endangering the owner's life, when the sensor at the front end detects the gas, the temperature will change, and the process of the change is triggered by the processing circuit into a control signal to trigger an alarm signal.
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