前向散射式能见度测量技术研究  

Research on the Foreword Scattering Visibility Detection

作　　者：李孟麟[1] 段发阶[1] 欧阳涛[1] 张玉贵[1] 

机构地区：[1]天津大学精密测试技术及仪器国家重点实验室,天津300072

出　　处：《传感技术学报》2008年第7期1281-1285,共5页Chinese Journal of Sensors and Actuators

基　　金：国家自然基金资助(50375110);教育部新世纪优秀人才支持计划资助(NECT)

摘　　要：介绍了一种基于红外前向散射原理的能见度测量仪的原理和测量方法。对其检测电路设计中的技术难点——发射光功率稳定和微弱信号的检测放大进行了讨论并提出了相应的解决方案。通过发射端双光路闭环负反馈回路设计和接收端锁相放大电路的应用提高了仪器稳定度和测量精度。并制作了实验样机模拟现场环境验证了电路实际效果。A method to detect the visibility, which is based on the principle of infrared foreword scattering, has been introduced. Discussions and solutions to the problems about the stabilization of emission light power and detection of weak signal have been illuminated. It is explained that the precision and stabiliza- tion of the visibility meter were improved by double-negative feedback closed loop circuit in emitting side and lock-in amplifier in receiving side. And such improvements have been certified by experiments.

关 键 词：大气能见度 前向散射 红外LED 稳功率控制 锁相放大器 

分 类 号：TP216[自动化与计算机技术—检测技术与自动化装置]