摘要
研究了光全散射法在大范围空间颗粒物浓度监测中的应用及实现。借助于结构设计和调制解调技术去除环境中背景光对光电转换的影响,为避免光源光强的波动对系统稳定性的干扰,采取光强反馈措施进行补偿。应用多波长消光法,结合Lambert-Beer定律和Mie散射理论,实现开放空间颗粒物浓度值的测量。将系统的计算结果和标准仪器进行实时对比,二者的Pearson相关系数为0.988 9,数据有较好的一致性,系统量程可达0~400 mg/m^3,响应时间为1 min。为大范围空间颗粒物质量浓度的监测提供了一种快速、实时的手段。
The application and implementation of total light scattering were studied to monitor particulate matter mass concentration in large areas. By means of structural design and modem technology, it removed the influence of environment background light in the process of photoelectric conversion, in order to avoid the disturbance on the system＇s stability because of light source intensity＇s fluctuation, the light intensity feedback was applied to compensate for it. Using the multiple wavelength method, combined with the Lambert-Beer law and Mie scattering theory, it implemented particle concentration detection in wide open spaces. Compared the system＇s calculated results with the standard instrument, the Pearson correlation coefficient is 0.988 9, it indicates that the data has good consistency, the range can reach 0-400 mg/m^3, the response time is I min. It provides a rapid and real-time method to monitor particulate matter mass concentration in large areas.
出处
《红外与激光工程》
EI
CSCD
北大核心
2016年第11期237-242,共6页
Infrared and Laser Engineering
基金
基金项目:美丽天津重大工程(14ZCDGSF00028)
关键词
光全散射法
颗粒物浓度
MIE散射
在线监测
total light scattering
particulate matter concentration
Mie scattering
on-line monitoring
