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| How to reduce false alarm for a PIR Motion Detector for Alean? |
| 2021.03.10 |
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Seven common questions & answers of the PIR Motion Detector
What is the judgment time delay after the infrared detector detects the human body?
The reaction time of the detector after detecting the human body is within 0.5 seconds.
What is the effect of the number of lens windows on the detector?
What is the difference between a precision lens and an ordinary lens?
The lens window is dense, and the detection distance will be far, but it may not be detected at close range.
A closer range is better. If the temperature changes sharply, that is, the instantaneous temperature difference is large.
How does the detector realize temperature compensation?
The detector compensates for the temperature change through the thermal element. When the temperature changes, the thermal element will perform temperature compensation by changing the resistance value.
How does the detector prevent pets?
The detector uses advanced asic fuzzy logic digital analysis technology (patent) to intelligently analyze the temperature, volume and movement characteristics of the intruding object to determine whether the intruding object is a real human body Movement, for non-real human movement, no alarm is triggered, so as to prevent pets.
How does the detector detect the intruder?
Which is more important, the sensor or the Fresnel lens?
The detector's detection of the intruder is realized by two key elements in the passive infrared detector, one is heat Electric discharge infrared sensor (pir), which can convert infrared signal changes with a wavelength of 8-12um into electrical signals, and can inhibit the white light signal in nature.
When no one is moving, what the pir senses is only detection Regional background temperature, when the human body enters the warning zone, through the Fresnel lens, Pir senses the difference signal between the human body temperature and the background temperature, and converts this signal into an electrical signal.
The other device is the Fresnel lens.
The Fresnel lens has two functions: one is focusing, that is, the pyro-infrared signal is refracted (reflected) on the pir, and the second is to divide the detection area into several bright spots. Zone and dark zone, so that the moving objects entering the detection area can produce a changing pyro-infrared signal on the pir in the form of temperature changes.
Both the sensor and the Fresnel lens are indispensable.
What is the meaning of fuzzy logic in the detector manual? Who chooses to insert the encoding chip?
How to choose the clock resistance? Fuzzy logic refers to a set of mathematical model algorithms contained in the cpu, and its main function is to intelligently analyze and detect the collection of sensors. Signal, to determine whether it is the movement of the human body or the movement of other objects, which truly realizes the intelligence of the detector.
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