福州本特利 传感器 125720-02
价格：99.00起
红外传感器和激光传感器是两个不同的概念！
红外（infrared）：波长约在3.3μm左右的电。
红外线传感器：利用红外线的物性质来进行测量的传感器。红外线又称红外光。红外线传感器测量时不与被测物体直接接触，抗干扰性能差，需要透镜将红外光过滤后再进行测量，并且需要定期校准。
激光（laser）：在1.65um由受激发射的光，放大产生的。激光传感器：利用激光技术进行测量的传感器。它由激光器、激光检测器和测量电路组成。它的优点是能实现无接触远距离测量，速度快，精度高，量程大，抗光、电干扰能力强等。
红外线传感器包括光学系统、检测元件和转换电路。光学系统按结构不同可分为透射式和反射式两类。检测元件按工作原可分为热敏检测元件和光电检测元件。热敏元件应用多的是热敏电阻。热敏电阻受到红外线时温度升高，电阻发生变化，通过转换电路变成电信号输出。光电检测元件常用的是光敏元件，通常由硫化铅、硒化铅、化铟、化锑、碲镉汞合金、锗及硅掺杂等材料制成。
激光传感器工作时，先由激光发射二管对准目标发射激光脉冲。经目标反射后激光向各方向散射。部分散射光返回到传感器，被光学系统接收后成像到雪崩光电二管上。雪崩光电二管是一种内部具有放大功能的光学传感器，因此它能检测其微弱的光信号，并将其转化为相应的电信号。常见的是激光测距传感器，它通过记录并处从光脉冲发出到返回被接收所经历的时间，即可测定目标距离。激光传感器必须其地测定传输时间，因为光速太快。
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