Wang Shu-tao, Wang Zhi-fang, Liu Ming-hua, Wei Meng, Chen Dong-ying, Wang Xing-long
Guang Pu Xue Yu Guang Pu Fen Xi. 2016 Jan;36(1):287-91.
According to the spectral absorption characteristics of polluting gases and fluorescence characteristics, a time-division multiplexing detection system is designed. Through this system we can detect Methane (CH4) and sulfur dioxide (SO2) by using spectral absorption method and the SO2 can be detected by using UV fluorescence method. The system consists of four parts: a combination of a light source which could be switched, the common optical path, the air chamber and the signal processing section. The spectral absorption characteristics and fluorescence characteristics are measured first. Then the experiment of detecting CH4 and SO2 through spectral absorption method and the experiment of detecting SO2 through UV fluorescence method are conducted, respectively. Through measuring characteristics of spectral absorption and fluorescence, we get excitation wavelengths of SO2 and CH4 measured by spectral absorption method at the absorption peak are 280 nm and 1.64 μm, respectively, and the optimal excitation wavelength of SO2 measured by UV fluorescence method is 220 nm. we acquire the linear relation between the concentration of CH4 and relative intensity and the linear relation between the concentration of SO2 and output voltage after conducting the experiment of spectral absorption method, and the linearity are 98.7%, 99.2% respectively. Through the experiment of UV fluorescence method we acquire that the relation between the concentration of SO2 and the voltage is linear, and the linearity is 99.5%. Research shows that the system is able to be applied to detect the polluted gas by absorption spectrum method and UV fluorescence method. Combing these two measurement methods decreases the costing and the volume, and this system can also be used to measure the other gases. Such system has a certain value of application.
根据污染气体的光谱吸收特性和荧光特性，设计了一种时分复用检测系统。通过该系统，我们可以利用光谱吸收法检测甲烷（CH₄）和二氧化硫（SO₂），并利用紫外荧光法检测SO₂。该系统由四部分组成：可切换光源组合、公共光路、气室和信号处理部分。首先测量光谱吸收特性和荧光特性。然后分别进行通过光谱吸收法检测CH₄和SO₂的实验以及通过紫外荧光法检测SO₂的实验。通过测量光谱吸收和荧光特性，我们得到光谱吸收法在吸收峰处测得的SO₂和CH₄的激发波长分别为280nm和1.64μm，紫外荧光法测得的SO₂的最佳激发波长为220nm。进行光谱吸收法实验后，我们得到了CH₄浓度与相对强度之间的线性关系以及SO₂浓度与输出电压之间的线性关系，线性度分别为98.7%、99.2%。通过紫外荧光法实验，我们得到SO₂浓度与电压之间呈线性关系，线性度为99.5%。研究表明，该系统能够应用于通过吸收光谱法和紫外荧光法检测污染气体。将这两种测量方法结合起来降低了成本和体积，并且该系统还可用于测量其他气体。这样的系统具有一定的应用价值。
