Many people do not know how to install the infrared alarm after purchasing the infrared alarm. Looking at the manual over and over again, it is always indispensable. The following describes the principle of infrared alarm and installation method, take a look at it.

First, the principle of infrared alarm

Infrared alarm is divided into active infrared alarm and passive infrared alarm. Here we take a look at the working principle of active infrared alarm and passive infrared alarm:

The active infrared intrusion alarm consists of a transmitter and a receiver. The transmitter consists of a power supply, a light source, and an optical system. The receiver is composed of an optical system, a photoelectric sensor, an amplifier, and a signal processor. The active infrared alarm is an infrared beam shield type alarm. The infrared light emitting diode in the transmitter emits a modulated infrared beam (the wavelength of this beam is between 0.8 and 0.95 microns) under the excitation of the power source. After the action of the optical system becomes parallel light emission. This beam is received by the receiver, the infrared photoelectric sensor in the receiver converts the optical signal into a signal, passes through the circuit and passes it to the alarm controller. The infrared rays emitted by the transmitter reach the receiver through the defense zone, forming a warning line. Under normal circumstances, the receiver receives a stable optical signal. When someone enters the cordon, the infrared beam is blocked and the infrared signal received by the receiver changes. This change is extracted, amplified, and properly processed. Alarm signal from the controller. At present, such alarms have two beams, three beams, and multiple beam infrared fences. Generally used in the perimeter to prevent more, the biggest advantage is to prevent the distance, can reach more than ten times the detection range of passive infrared.
Passive infrared alarm is mainly based on changes in the external infrared energy to determine whether someone is moving. The infrared energy of the human body is different from the environment. When people pass through the detection area, the position of this different infrared energy collected by the alarm changes, and then an alarm is issued through analysis. The human body has a constant body temperature, usually around 37 degrees, and it emits infrared light with a specific wavelength of about 10 [mu]m. A passive infrared alarm device works by detecting infrared radiation of about 10 [mu]m emitted by the human body. The 10 μm or so infrared emitted by the human body is enhanced by the Fresnel filter and collected on the infrared sensor. Infrared sensors usually use pyroelectric elements, which lose their charge balance when they receive a change in the temperature of infrared radiation from the human body, releasing charge outward, and the subsequent circuit can generate an alarm signal after detection and processing.

1. The passive infrared alarm is aimed at detecting human radiation, so the pyroelectric element must be very sensitive to infrared radiation with a wavelength of about 10 μm.
2. In order to be sensitive only to human body's infrared radiation, a special Fresnel filter is usually covered on its radiation surface, so that the environmental interference is obviously controlled.
3. The sensor includes two pyroelectric elements connected in series or in parallel with each other. In addition, the two polarization directions are exactly the opposite. The ambient background radiation has almost the same effect on the two pyroelectric elements, causing them to cancel each other's charge generation effects, so that the alarm has no signal output.
4. Once intrusion into the detection area, the human body infrared radiation is partially focused by the mirror and received by the pyroelectric element. However, the heat received by the two pyroelectric elements is different, and the pyroelectricity is different and cannot be cancelled. Call the police. Second, home infrared alarm installation

Before installing the infrared alarm, first the alarm host should be energized in a fixed position, and the alarm probe should be hung at a height of about 2 meters so that it can be tilted forward to obtain higher sensitivity. After the power is turned on, after a delay of about 1 minute, the alarm enters the alert state. At this time, if someone enters the monitoring area, an alarm will be given. Alarm about 1 minute, stop automatically. Then back to alert.

When the host enters, first press the power-off key on the remote control. When the infrared alarm sounds 'beep', the alarm is turned off and no alarm occurs when entering the warning zone. When the owner leaves the guard area, press the power button, and the alarm sounds with an audible alarm.
In case of an emergency, press the emergency alarm button and the infrared alarm is the emergency alarm.
There are high, medium and low sensitivity adjustments in the infrared alarm system. Users can adjust them according to their needs.

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