Buffer structure optimization of the photoacoustic cell for trace gas detection  

作　　者：CAI Yang Norhana Arsad LI Min WANG Yao 

机构地区：[1]Department of Physics, Wuhan University of Technology, Wuhan 430070, China [2]Department of Electric, Electronics & System Engineering, Faculty of Engineering & Built Environment, UniversitiKebangsaan Malaysia, Selangor 43600, Malaysia

出　　处：《Optoelectronics Letters》2013年第3期233-237,共5页光电子快报（英文版）

基　　金：This work has been supported by the National Natural Science Foundation of China （No.61177076）, and the Fundamental Research Funds for the Central Universities （No.2012-Ia-020）.

摘　　要：The equivalent four-pole network model is used to simulate one-dimension longitudinal acoustic resonator with different buffer diameters and lengths, aiming to reach a theoretic model which is able to estimate the optimal buffer geometry. In experiments, the buffer volumes are decreased gradually by filling a set of aluminum rings with different inner diameters and lengths into the buffers to get the desired dimensions. The experimental results show that the average deviation of 1.1% is obtained between the experimental results and the theoretical simulation at the buffer length of 30 mm. Experiments show that the minimum background signal occurs when the buffer length is equal to a quarter of the acoustic wavelength (λ/4). The amplitude of the photoacoustic signal is barely influenced when dbuf>3dres. Considering that oversize of photoacoustic cell needs more measuring gas and more material, the buffer diameter can be deduced to dbuf≈3dres. Therefore, smaller photoacoustic cell is desirable.The equivalent four-pole network model is used to simulate one-dimension longitudinal acoustic resonator with different buffer diameters and lengths, aiming to reach a theoretic model which is able to estimate the optimal buffer geometry. In experiments, the buffer volumes are decreased gradually by filling a set of aluminum rings with different inner diameters and lengths into the buffers to get the desired dimensions. The experimental results show that the average deviation of 1.1% is obtained between the experimental results and the theoretical simulation at the buffer length of 30 mm. Experiments show that the minimum background signal occurs when the buffer length is equal to a quarter of the acoustic wavelength （2/4）. The amplitude of the photoacoustic signal is barely influenced when Considering that oversize of photoacoustic cell needs more measuring gas and more material, the buffer diameter can be deduced to dbudres. Therefore, smaller photoacoustic cell is desirable.

关 键 词：缓冲液 光声池 结构优化 痕量检测 气体 网络模型 理论模拟 光声信号 

分 类 号：O212.7[理学—概率论与数理统计] X832.02[理学—数学]