基于角反射器的单端透射式能见度仪的研究

Investigation on One-Terminal Transmission Visibility Meter Based on Using Corner Reflector

大气水平能见度是交通运输等领域的重要气象要素之一。基于透射式水平能见度的测量原理,提出采用角反射器的单端透射式能见度测量方案。该系统的发射器和接收器组合一体,便于光路校准,光路往返增加了水平气柱样本长度,扩大了能见度测量范围。利用锁相放大技术抑制噪声有效提高能见度测量精度,测试结果得出,锁相放大电路测量大气透过率与实际值的相关系数达0.9998。最后给出大气能见度实测结果,定量计算显示,与国外能见度仪的测量结果相关系数R为0.9904。

The atmospheric horizontal visibility is one of the important parameters in some realms such as transportation. A method of one-terminal transmission visibility meter by using corner reflector is proposed based on the principle of transmission visibility measurement. The system is easy to be adjusted and calibrated due to combination of transmitter and receiver. With the laser light going and back, the length of horizontal atmosphere volume is doubled, so the visibility measurement range is extended. By means of phase locking amplifying, signal noise has been effectively suppressed and the accuracy of visibility measurement is improved. The result of the experiments shows that correlation coefficient between measured value and actual value is up to 99.98%. Finally, the results of visibility measurement are given. Reaserches indicate that correlation coefficient R between our system and foreign instrument is 0.9904.