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In order to accurately detect the concentration of various elemental gases in flue gas, based on beer-lambert's law and the multivariate superposition of absorbance, this paper proposes a mutually recursive iterative algorithm for solving multi-gas concentration. The algorithm uses different gases to absorb ultraviolet light at 190nm ~ 290nm with different characteristic absorption peaks. According to the degree of absorption of photons by primary and secondary gases, it carries out multiple recursive iterative operations until the difference of concentration between two adjacent gases is less than a specific value. The experimental results show that the measurement error of gas concentration is within 3%, which meets the design requirements.

The difficulty of using ultraviolet spectroscopy to measure the harmful components of flue gas is that the gases have mutual interference and their characteristic absorption peaks also interfere with each other. In this paper, we propose a cyclic iterative algorithm to solve the problem of mutual interference between gases by using Lambert-Beer’s law and absorbance. The algorithm uses different UV-light wavelengths at 190 nm–290 nm for different characteristics of UV light with different absorption peaks. The iteration is repeated until the concentration difference between adjacent two gases is less than a certain value. It is considered that the elemental gas The exact concentration, and through the programming to achieve the results. The experimental results show that the algorithm can calculate the actual exact concentration of various simple gases in the mixed gas, and the accuracy error does not exceed 3%. The actual gas detection requirements can be met.

Most of the spectrometer has the advantages of large volume, inconvenient carrying, slow data reading, long development cycle and high cost. In view of this situation, this paper presents a raspberry based portable spectrum analyzer. The general structure, working principle and data reading principle of the portable ultraviolet spectrum analyzer system based on raspberry faction are introduced in detail. And the raspberry sent a brief introduction, and finally introduced the raspberry pie to the development of the environment configuration, and the use of Python-Qt prepared control software for data read. The final test shows that the system interface is simple and friendly, stable operation, you can quickly read the data from the spectrometer, to meet the actual requirements.