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Jtron HB100 10.525GHz Microwave Doppler Radar Detector Probe Sensor
HB100 microwave modules is the use of Doppler radar (Doppler Radar) design principles of the microwave moving object detector£¬ mainly used in automatic door control switch£¬ security systems£¬ ATM cash dispenser automatic recording control system£¬ automatic train signals£¬ etc. places. HB100 10.525GHz standard microwave Doppler radar detector£¬ the detection method in comparison with other detection method has the following advantages: 1£¬ non-contact probe; 2£¬ independent of temperature£¬ humidity£¬ noise£¬ air£¬ dust£¬ light other effects£¬ suitable for harsh environments; 3£¬ anti-RF interference ability; 4£¬ the output power is small£¬ constitute a hazard to humans; 5£¬ distance: detection range over 20 meters. Doppler principle Introduction: Doppler theory based on time£¬ when radio waves hit an object in the process of moving the wave is reflected£¬ the frequency of the reflected wave will move across the state with an object is changed. If the touch position of the object radio wave is fixed£¬ the frequency of the reflected wave and the transmitted wave frequency should be equal. If the object moves in the direction of transmission£¬ the reflected wave will be compressed£¬ that will increase the frequency of the reflected wave; conversely the frequency of the wave will be reflected decreases. According to the principle of the Doppler microwave detectors designed by the FET source media DRO microwave oscillation (10.525GHz)£¬ power splitter£¬ transmitting antenna£¬ receiving antenna£¬ mixers£¬ detectors and other circuit (Figure 2). Outwardly directed microwave transmit antennas£¬ when the object is encountered and the reflected wave received by the receiving antenna£¬ a mixer and then to the oscillation mixed at low-frequency signal after detection of the reaction speed of moving objects.