1769-ECR美国AB现货低价
1769-ECR美国AB现货低价
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车辆的存在与通过的检测
感应线圈(电感式传感器)
电感式传感器其主要部件是埋设在公路下十几厘米深处的环状绝缘电线(特别适合新铺道路,可用混凝土直接预埋,老路则需开挖再埋)。当有高频电流通过电感时,公路面上就会形成如图1(a)中虚线所形成的高频磁场。当汽车进入这一高频磁场区时,汽车就会产生涡流损耗,环状绝缘电线的电感开始减少。当汽车正好在该感应线圈的正上方时,该感应线圈的电感减到zui小值。当汽车离开这高频磁场区时,该感应线圈电感逐渐复原到初始状态。由于电感变化该感应线圈中流动的高频电流的振幅(本论文所涉及的检测工作方式)和相位发生变化,因此,在环的始端连接上检测相位或振幅变化的检测器,就可得到汽车通过的电信号。若将环状绝缘电线作为振荡电路的一部分,则只要检测振荡频率的变化即可知道汽车的存在和通过。
电感式传感器的高频电流频率为60khz,尺寸为2×3m,电感约为100μh.这种传感器可检测的电感变化率在0.3%以上[1,2]。
电感式传感器安装在公路下面,从交通安全和美观考虑, 它是理想的传感器。传感器选用防潮性能好的原材料。
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