中国物理B ›› 2014, Vol. 23 ›› Issue (4): 40703-040703.doi: 10.1088/1674-1056/23/4/040703
杨阳, 董凤忠, 倪志波, 庞涛, 曾宗泳, 吴边, 张志荣
Yang Yang (杨阳), Dong Feng-Zhong (董凤忠), Ni Zhi-Bo (倪志波), Pang Tao (庞涛), Zeng Zong-Yong (曾宗泳), Wu Bian (吴边), Zhang Zhi-Rong (张志荣)
摘要: Theoretical analysis for an online measurement of the stack gas flow velocity based on the optical scintillation method with a structure of two parallel optical paths is performed. The causes of optical scintillation in a stack are first introduced. Then, the principle of flow velocity measurement and its mathematical expression based on cross correlation of the optical scintillation are presented. The field test results show that the flow velocity measured by the proposed technique in this article is consistent with the value tested by the Pitot tube. It verifies the effectiveness of this method. Finally, by use of the structure function of logarithmic light intensity fluctuations, the theoretical explanation of optical scintillation spectral characteristic in low frequency is given. The analysis of the optical scintillation spectrum provides the basis for the measurement of the stack gas flow velocity and particle concentration simultaneously.
中图分类号: (Instruments for environmental pollution measurements)