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各向異性磁阻傳感器在車輛探測中的應用

Application of AMR sensors to vehicle detection

  • 摘要: 研制了一種基于各向異性磁阻(AMR)傳感器的車輛探測器.該車輛探測器由三維AMR傳感器及相應的信號處理電路組成.當車輛駛過探測器上方時,車輛的存在將會引起周圍磁場的變化,三維AMR傳感器輸出將發生相應的變化,根據AMR傳感器的輸出可判斷周圍空間內車輛的存在與否.對該探測器的特性進行了實驗研究.實驗結果表明:當車輛分別沿南北向、東西向通過AMR傳感器上方時,傳感器輸出變化規律不同;該探測器可實現車輛探測.

     

    Abstract: A vehicle detector with an anisotropic magnetoresistive (AMR) sensor was developed. The vehicle detector consisted of a three-axis AMR sensor and related signal processing circuit. When a vehicle was moving over the detector, the surrounding magnetic field changed due to vehicle disturbance, and the output of the three-axis AMR sensor changed accordingly. Whether a vehicle was present or not could be judged based on the AMR sensor's output. The detector's characteristic was tested. When the vehicle being detected was moving over the detector along different directions (south-north, east-west), the output changes were different. The results show that this detector can realize the function of vehicle detection.

     

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