Introduction to The Advantages and Disadvantages of PIR Sensor performance

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Introduction to The Advantages and Disadvantages of PIR Sensor performance

Posted By guangke alex     January 14, 2022    

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 PIR传感器可以检测人或某些动物发出的红外线,并将其转换成电信号输出。当某些晶体被加热时,晶体两端会产生等量的相反符号的电荷。这种由热变化引起的电极化称为热释电效应。热释电传感器利用热释电效应,是一种温度敏感型传感器。在生活中,这种传感器也会应用到 户外照明中,比如 带有PIR传感器的led泛光灯

  该传感器的组成主要包括外壳、滤波器、热释电元件(感应敏感元件)、场效应管场效应管等。PIR传感器也分为主动红外传感器和被动红外传感器。与主动式红外传感器不同,被动式红外传感器本身不发射任何类型的辐射,隐蔽性好,设备功耗低,价格低廉。但是,无源热释电传感器也有缺点,例如:

  1. 信号幅度小,容易受到各种热源和光源的干扰。
  2. 被动红外穿透性差,人体红外辐射容易被遮挡,不易被探头接收。
  3. 易受射频辐射的干扰。
  4. 当环境温度接近人体温度时,检测和灵敏度会显着下降,有时会造成短期故障。
  5. 被动红外探测器的主要探测运动方向是横向运动方向,对径向运动物体的探测能力比较差。

宁波铭星照明有限公司是一家  拥有自己的 户外照明工厂的中国户外灯具制造商公司全年提供防水、耐用、质量有保证的led泛光灯。

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