组合式LED宽带光源灯结构对差分吸收光谱反演的影响和扣除方法研究

doi:10.3964/j.issn.1000-0593(2023)11-3339-08

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Abstract The narrow emission spectrum of light emitting diode（LED) limits differential optical absorption spectroscopy（DOAS）retrieval range, and it is not easy to realize simultaneous measurement of various gases. In this paper, two kinds of ultraviolet LEDs are combined to form a combined LED broadband light source, which is applied to DOAS to simultaneously detect atmospheric SO₂ and O₃. The spectral analysis shows that their spectrum is superimposed in 280~295 nm and has an obvious lamp structure in 275~301 nm. The structure enhances and drifts to the shortwave direction with the increase of the dual-peak light intensity ratio. During actual measurement, the LED spectrum will change independentlydue to the environmental conditions. Moreover, atmospheric extinction is different in their emission spectral bands. Therefore, the dual-peak light intensity ratio ofthe atmospheric spectrum will change continuously and is inconsistent with the lamp spectrum. It is not easy to offset the lamp structure by dividing the two.The spectrum retrieval results show that the combined lamp structure as a reference spectrum can not fit well with the interference structure. In order to remove the influence of independent LED spectrum changes on spectrum retrieval during measurement, it is proposed to use each LED lamp structure as a reference spectrum to participate in the fitting. The fitting residuals of SO₂ and O₃ are reduced from 1% and 6‰ to about 4‰, respectively, and the interference structure is well removed.Compared with evading interference structure, the retrieval range of SO₂ and O₃ is broadened, and the number of SO₂ and O₃ absorption peaks in the retrieval range is increased by 1.75 and 1 time, respectively. The average fit errors of SO₂ and O₃ are reduced by 67.5% and 37.3% respectively. The measurement accuracy is significantly improved. The measuremens are compared with the SO₂ and O₃ levels measured by the traditional xenon lamp long path DOAS system. The comparison shows excellent agreements with Pearson correlation coefficients (R) of SO₂ and O₃ measurements above 95%. The results demonstrate that the lamp structure of a combined LED broadband light source can be fitted by the independent lamp structure of each LED in DOAS retrieval.

Key words：Differential optical absorption spectroscopy; Combined LED broadband light source; Spectral structure removal; Simultaneous detection

Received: 2022-02-18 Accepted: 2022-11-29

ZTFLH:

O433

Corresponding Authors: ZHENG Ni-na

Cite this article:

ZHENG Ni-na,XIE Pin-hua,QIN Min, et al. Research on the Influence of Lamp Structure of the Combined LED Broadband Light Source on Differential Optical Absorption Spectrum Retrieval and Its Removing Method[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(11): 3339-3346.

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2023)11-3339-08 OR https://www.gpxygpfx.com/EN/Y2023/V43/I11/3339

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