大气能见度测量仪发射端通过红外led光源发射红外光，红外光源透过一定体积的空气，由空气中的气体分子，气溶胶粒子、雾滴等引起红外光源散射，能见度测量仪接收端通过接收红外光源散射光的强度来确定能见距离，同时仪器可对能见度连续测量输出。
【能见度定义】：大气能见度定义为具有正常视力的人在当时的天气条件下还能够看清楚目标轮廓的大地面水平距离。
【功能介绍】：大气能见度测量仪发射端通过红外led光源发射红外光，红外光源透过一定体积的空气，由空气中的气体分子，气溶胶粒子、雾滴等引起红外光源散射，能见度测量仪接收端通过接收红外光源散射光的强度来确定能见距离，同时仪器可对能见度连续测量输出。
【检测原理】：35°前向散射原理，测量更准确。
【整体外观】：整体环抱式一体化设计使内部电缆的布局更趋合理。
【测量元件】：光学部件镜头，红外led光源。
①、采用了光学部件镜头朝下并带有防护罩，有效防止降水、飞沫或尘埃进入镜头，减少探头表面的污染，这种设计提供了的测量结果并减少了维护的需要。
②、探头的防护罩为铝合金材料，表面涂有防腐蚀的玻璃纤维涂层。
③、能见度仪的过电压和电磁保护装置能保证传感器的长时间安全运行。
④、红外LED光源，增加滤光设计、抗光源干扰。
⑤、低功耗，内部电路抗干扰设计。
⑥、仪器的直流供电电路具有防反接和自恢复保险双重设计。
【设备清单】：大气能见度测量仪1台+2个抱箍。
①、将能见度传感器安装到距离地面大约2米的地方。
②、保证能见度下方不要有别的物体，干扰测试。
③、理想安装场地应距大型建筑物或其它会产生热量及妨碍降雨的设施至少100米，而且也要避免树荫的影响。
④、场地应无干扰光学测量的障碍物、反射面和明显的污染源。
⑤、选择合适地点安装设备，设备提供安装抱箍，利用抱箍将设备安装到75mm立杆上，为避免光源干扰，发射端务必在南侧。
【供电方式】：10-30vdc宽压供电。
【测量范围】：0-10000m。
【测量误差】：≤1KM±2%;±10%>1KM。
【分辨率】：1m
【更新间隔】：20s
【平均时间】：（MTBF）大于18000小时
【工作环境温度】：-40~60℃
【工作相对湿度】：不大于95%（30℃）
【重量】：小于10kg
【功耗】：0.5w
【红外光波长】：870nm
【信号输出方式】：RS485，标准modbus-rtu协议
【可测能见度数据种类】：
①、实时能见度数值
②、能见度10min平均值
③、能见度1min平均值
【光学镜头洁净等】：可实时读取红外光发射端、接收端的镜头洁净度，清洁度等1-5，5代表清洁度高，当清洁度小于3时需要现场清理光学镜头。
1.能见度20-30公里能见度视野清晰
2.能见度15-25公里能见度好视野较清晰
3.能见度10-20公里能见度一般
4.能见度5-15公里能见度较差视野不清晰
5.能见度1-10公里轻雾能见度差视野不清晰
6.能见度0.3-1公里大雾能见度很差
7.能见度小于0.3公里重雾能见度差
8.能见度小于0.1公里浓雾能见度差
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