一种通过测量大气消光系数，按照经验公式得出大气中肉眼观测距离的仪器。能见度仪是测量大气能见距离的仪器。分为透视式和散射式两种。前者是通过大气透射率或者消光系数来确定能见距离。后者是通过测量一定体积空气中由气体分子，气溶胶粒子、雾滴等引起的散射光的强度来确定能见距离。
介绍了一种红外散射能见度仪的原理和设计方法。
Aforward scatter infrared visibility meter and its design meth - od are introduced.
前向散射能见度仪测量前向散射光强度，确定大气的消光系数，进而获得大气的能见度值。
The intensity of forward-scattered light is measured by the forward-scattering visibility sensor, which determines the extinction coefficient of the air, then the visibility can be obtained.
前向散射式能见度仪具有体积小、成本低，便于安装等特点，适用于高速公路沿线能见度检测。
Forward scattering-type visibility detector has many excellence including small size, low cost and easy to install and so on, it is suitable for highway visibility detection.
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