Telemetry Research of NO2 Concentration in the Night Based on LED and DOAS Method
文献类型：期刊论文
| 作者 | Yang L(杨雷)1 ; Li A(李昂)1; Xie PH(谢品华)1; Hu ZK(胡肇焜)1; Liang SX(梁帅西)1; Zhang YH(张英华)1; Huang YY(黄业园)1
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| 刊名 | SPECTROSCOPY AND SPECTRAL ANALYSIS
 |
| 出版日期 | 2019 |
| 卷号 | 39 |
| 关键词 | Blue LED Differential optical absorption spectroscopy NO2 measurement Atmospheric optics |
| ISSN号 | 1000-0593 |
| 其他题名 | Telemetry Research of NO_2 Concentration in the Night Based on LED and DOAS Method |
| 英文摘要 | Aiming at the problem that existing passive DOAS methods using natural light sourcecannot detect the vertical distribution of NO2 and other trace gases at night, this paper proposes a method of DOAS measurement of NO2 based on the blue LED technology of narrowband light source, and uses this method to build the instrument system. Successfully realized the concentration measurement of NO2 gas by using the instrument system. This system is mainly composed of two parts: a light source emitting system and a telescope receiving system. The LED with the dominant wavelength of 450 nm is used as a light source to collect the scattered light of the light beam through the telescope. The scattered light received by the telescope is imported into the spectrometer through fiber coupling, DOAS principle using a computer for processing. The theoretical basis for DOAS is Lambert-Beer's law, which describes the attenuation of the electromagnetic radiation energy as it penetrates the material. Based on this principle, the data processing can be summarized as follows : Firstly, a relatively clean spectrum is taken as the background reference spectrum, and the actual measured atmospheric spectrum is divided by the reference spectrum, and the digital high-pass filtering is used to remove the slow changes and then take the logarithm to obtain the optical thickness. Secondly, the instrument function is convolved with the high-resolution cross-section of NO2 to get the low-resolution absorption cross-section matched with the instrument used. Finally, the differential absorption cross-section is combined with the processed differential optical thickness, and the least square method is used to fit out the NO2 concentration value with the light path L. At the same time, by adjusting the angle of light emission and the receiving angle of the telescope, the NO2 concentration at different positions can be measured, and then the three-dimensional distribution of NO2 gas concentration can be obtained. Under the condition of the algorithm determined, the quality of the LED light spectrum is particularly important for the reliability of the instrument system. As the temperature and drive current have a greater impact on the LED spectrum, in order to ensure that the LEDs are in the best working condition, carried out the LED spectral temperature and drive current sensitivity experiments. |
| 语种 | 英语 |
| CSCD记录号 | CSCD:6503924 |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/53747]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 作者单位 | 1.中国科学院安徽光学精密机械研究所 2.中国科学院安徽光学精密机械研究所 3.中国科学院安徽光学精密机械研究所 4.中国科学院安徽光学精密机械研究所 5.中国科学院安徽光学精密机械研究所 6.中国科学院安徽光学精密机械研究所 7.中国科学院安徽光学精密机械研究所 |
| 推荐引用方式 GB/T 7714 | Yang L,Li A,Xie PH,et al. Telemetry Research of NO2 Concentration in the Night Based on LED and DOAS Method[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS,2019,39. |
| APA | 杨雷.,李昂.,谢品华.,胡肇焜.,梁帅西.,...&黄业园.(2019).Telemetry Research of NO2 Concentration in the Night Based on LED and DOAS Method.SPECTROSCOPY AND SPECTRAL ANALYSIS,39. |
| MLA | 杨雷,et al."Telemetry Research of NO2 Concentration in the Night Based on LED and DOAS Method".SPECTROSCOPY AND SPECTRAL ANALYSIS 39(2019). |
入库方式： OAI收割
来源：合肥物质科学研究院
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