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The lens window is dense, and the detection distance will be far, but it may not be detected at a short distance. The distance of the window detection is close, and the range closer to the detection is better.
2. What is the difference between a Fresnel lens and a curtain type?
The space detector has 31 Fresnel lens windows and 11 curtain Fresnel lens windows. The shape of the two lens windows is different.
3. How is the detector protected against pets?
The detector adopts advanced ASIC fuzzy logic digital analysis technology (patent) to intelligently analyze the body temperature, volume and movement characteristics of invading objects, and determine whether the invading object is a real human body movement, for non-real human body movement. Do not trigger an alarm to reach the anti-pump.
4. If the temperature changes abruptly, that is, the instantaneous temperature difference is large, how does the detector achieve temperature compensation?
The detector compensates for temperature changes by the thermal element. When the temperature changes, the temperature Sensor compensates by changing the resistance value.
5. How does the detector detect the intruder, and which sensor is more important than the Fresnel lens?
The detection of the intruder by the detector is realized by two key components in the passive infrared detector. One is a pyroelectric infrared sensor (PIR), which can change the infrared signal with a wavelength between 8 and 12 μm. It is converted into an electric signal and can suppress the white light signal in nature. When no one moves, the PIR senses only the background temperature of the detection area. When the human body enters the warning zone, the PIR senses through the Fresnel lens. A signal that differs between body temperature and background temperature and converts this signal into an electrical signal. The other device is a Fresnel lens. The Fresnel lens has two functions: one is focusing, that is, the pyroelectric infrared signal is refracted (reflected) on the PIR, and the second function is to divide the detection area into several parts. The zones and dark zones allow moving objects entering the detection zone to produce varying thermal infrared signals on the PIR in the form of temperature changes. Both the sensor and the Fresnel lens are indispensable.
6. What does fuzzy logic in the detector manual mean? Who chooses to insert the code chip? How to choose the clock resistance?
Fuzzy logic refers to a set of mathematical model algorithms contained in the CPU. Its main function is to intelligently analyze and detect the signals collected by the sensor components to determine whether the human body is moving or other objects move, which truly realizes the intelligence of the detector. The coding chip and clock resistance are determined according to the wireless reception requirements of the host manufacturer. Currently, the common coding chips on the market are PT2262 and SM5162.
7. Is the material property of the detector's outer casing resistant to high temperature and flame retardant? Is there any technical technical parameter?
Engineering nylon is a new type of polyamide polymer engineering material developed on the basis of foreign monomer polymerization. It has the characteristics of high temperature resistance and deformation. The new engineering nylon has a specific gravity of 1.15~1.25T/M3, the coefficient of linear expansion is (5~12)×10-5/C, the heat distortion temperature is 120-180°C (1.8MP), and the hardness (HB) is 150～300N/MM2, friction coefficient is 0.002～0.25, impact strength is 360～650KJ/M2, tensile strength is 70～150MPa, bending strength is 120～180MPa, compressive strength is 100～150MPa, The dielectric strength is 8-20 MV/M.
8. What is the judgment time delay after the infrared detector detects the human body?
The reaction time after the detector detects the human body is within 0.5 seconds.
Detector knowledge quiz!
1. How much does the lens window window affect the detector? What is the difference between a precision lens and a normal lens?