Research on Wavelength Shift Correction Algorithm for Tunable Laser Absorption Spectrum | |
Tang Qi-xing1,3; Zhang Yu-jun1; Chen Dong1,2; Zhang Kai1,3; He Ying1; You Kun1; Liu Guo-hua1,3; Lu Yi-bing1,3; Fan Bo-qiang1,3; Yu Dong-qi1,3 | |
刊名 | SPECTROSCOPY AND SPECTRAL ANALYSIS
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2018-11-01 | |
期号 | 11页码:3328-3333 |
关键词 | Laser absorption spectroscopy Laser wavelength shift Time domain correlation Spectrum peak-finding |
ISSN号 | 1000-0593 |
DOI | 10.3964/j.issn.1000-0593(2018)11-3328-06 |
英文摘要 | Tunable semiconductor laser is featured by narrow bandwidth, fast wavelength scanning, and room temperature working temperature, etc. The laser absorption spectroscopy gas measurement system based on tunable diode laser is widely applied in atmospheric environmental monitoring and on-line industrial production process detection. In the actual measurement system, the center wavelength of the tunable semiconductor laser is affected by temperature and other factors. If the center wavelength is not corrected, the spectral data will be overlapped and the processed spectral line will be widened, which will affect the subsequent spectral line fitting and affect the accuracy of gas concentration inversion. Generally, the reference spectrum absorption line peak-finding method is used to align the offset of the spectral data. However, the accuracy of the peak wavelength in the spectral data is affected the random noise, the background and drift noise. In order to reduce the side effects mentioned above, an improved algorithm of the time domain correlation is proposed. Firstly, the autocorrelation of the spectral signal is carried out to improve the spectral signal-to-noise ratio to a certain extent, then the time-domain cross-correlation processing is applied, which can accurately calculate the laser wavelength offset, reduce the influence of spectral broadening, and improve the concentration inversion accuracy and measurement stability. Experiments have been carried out in the detection experimental system of gas concentration based on laser absorption. Experimental results show that the standard deviation of the original data is 1.4828 while the standard deviation of data correction is 0.4339 and 0.2936, respectively. The corrected standard deviation of improved method of time domain correlation correction is 0.1325 with the correlation coefficient higher than 0.992. The standard deviation of Euclidean distance is 1.7264. The system stability evaluation indicates that the modified standard deviation of the wavelength drift correction is up to 0.1443. |
WOS关键词 | TDLAS |
WOS研究方向 | Spectroscopy |
语种 | 英语 |
出版者 | OFFICE SPECTROSCOPY & SPECTRAL ANALYSIS |
WOS记录号 | WOS:000452247200002 |
内容类型 | 期刊论文 |
源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/40680] ![]() |
专题 | 合肥物质科学研究院_中科院安徽光学精密机械研究所 |
通讯作者 | Zhang Yu-jun |
作者单位 | 1.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, Hefei 230031, Anhui, Peoples R China 2.Hefei Univ Technol, Sch Instrument Sci & Optoelect Engn, Hefei 230009, Anhui, Peoples R China 3.Univ Sci & Technol China, Sci Isl Branch, Hefei 230026, Anhui, Peoples R China |
推荐引用方式 GB/T 7714 | Tang Qi-xing,Zhang Yu-jun,Chen Dong,et al. Research on Wavelength Shift Correction Algorithm for Tunable Laser Absorption Spectrum[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS,2018(11):3328-3333. |
APA | Tang Qi-xing.,Zhang Yu-jun.,Chen Dong.,Zhang Kai.,He Ying.,...&Yu Dong-qi.(2018).Research on Wavelength Shift Correction Algorithm for Tunable Laser Absorption Spectrum.SPECTROSCOPY AND SPECTRAL ANALYSIS(11),3328-3333. |
MLA | Tang Qi-xing,et al."Research on Wavelength Shift Correction Algorithm for Tunable Laser Absorption Spectrum".SPECTROSCOPY AND SPECTRAL ANALYSIS .11(2018):3328-3333. |
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