文档介绍：声和磁传感器在车辆检测中的应用
朱政强* 石云波王永龙
电子测试技术国家重点实验室,中北北大学,山西,太原 030051,
仪器科学与动动态测试教育部重点实验室,中北北大学,山西,太原 030051
摘要:::介绍了各向异性磁阻传感器与声传感器的测量原理: ,并将 HMC1002 与声传感器组合的探测器,用于
测量车辆的存在,方向和类别。当车辆驶过探测器上方时,车辆的存在将会引起周围磁场的变化化,同时车辆
的不同方向行驶,AMR 传感器输出将发生不同的变化化,根据 AMR 传感器的输出可判断周围空间内车辆的存
在与方向;根据对不同车型的声信号分析可以得到到不同的噪声频率;该探测器可实现车辆探测的存在,方
向和一定程度上的车型识别。
关键词各向异性磁阻传感器车辆探测器电容式麦克风
Application of Acoustic and ic Sensors in Vehicle
Detecting
ZHU Zhengqiang SHI Yunbo WANG Yonglong
National Key Laboratory for Electronic Measurement and Technology, North University of China, Taiyuan, Shanxi, 030051
Key Laboratory of Instrumentation Science & Dynamic Measurement (North University of China ), Ministry of Education ,
Taiyuan, Shanxi, 030051
Abstract: The basic theory of the anisotropic oresistive sensor and acoustic sensor were introduced. By
applying the bined by HMC1002 and acoustic sensor, the presence, direction and type of vehicles
can be measured. When a vehicle was moving over the detector, the surrounding ic field changed due to
vehicle disturbance, and when the vehicle moved from different direction, the output of AMR sensor will be
different. Based on the output of AMR sensor, the presence and direction can be detected. By analyzing the
acoustic signal of different type vehicle, different noise-frequency can be gained. The results show that this
detector can realize