Method for Measuring High Temperature Spectral Line Parameters Based on Calibration-Free Wavelength Modulation Technology

doi:10.3788/CJL202047.1011001

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	Method for Measuring High Temperature Spectral Line Parameters Based on Calibration-Free Wavelength Modulation Technology
	Y. Zang,Z. Xu,H. Xia,A. Huang,Y. He and R. Kan
刊名	Zhongguo Jiguang/Chinese Journal of Lasers
	2020
卷号	47 期号:10
ISSN号	2587025
DOI	10.3788/CJL202047.1011001
英文摘要	In the diagnosis of combustion flow field by absorption spectra, the accuracy of absorption molecular spectral line parameters directly affects the accuracy of the measurement of flow field parameters. In this paper, the absorption spectral line parameters of water molecules used as the main probe in combustion diagnostic studies are calibrated accurately. A near-infrared diode laser with a wavelength of 1469 nm is used as the light source, and the highly sensitive calibration-free wavelength modulation technology is used. Combining with the established laboratory high temperature measuring system, we obtain the modulation absorption spectra of the selected spectral lines in the temperature range of 9001500 K. By using the nonlinear least square L-M fitting method to fit the H2O absorption spectra, the line intensities, self-broadening coefficients, and temperature dependent coefficients of the selected spectral lines at 6807.83 cm-1 and 6808.04 cm-1 are accurately obtained. By comparing the HITRAN and HITEMP databases, we obtain that the relative deviations of line strengths are 3.91% and -5.40%, the relative deviations of self-broadening coefficients are 3.01% and -6.49%, the temperature dependence coefficients are 0.5213 and 0.4567, and the uncertainties of the experimental results of the two line strengths are 1.05% and 1.96%, respectively. The spectral parameter calibration method based on calibration-free wavelength modulation has the advantages of high detection sensitivity and spectral signal-to-noise ratio in high temperature spectral measurement, which is conductive to improve the accuracy of spectral parameter calibration, and will provide spectral line foundation for accurate inversion of combustion flow field parameters. 2020, Chinese Lasers Press. All right reserved.
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内容类型	期刊论文
源URL	[http://ir.ciomp.ac.cn/handle/181722/64676]
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	Y. Zang,Z. Xu,H. Xia,A. Huang,Y. He and R. Kan. Method for Measuring High Temperature Spectral Line Parameters Based on Calibration-Free Wavelength Modulation Technology[J]. Zhongguo Jiguang/Chinese Journal of Lasers,2020,47(10).
APA	Y. Zang,Z. Xu,H. Xia,A. Huang,Y. He and R. Kan.(2020).Method for Measuring High Temperature Spectral Line Parameters Based on Calibration-Free Wavelength Modulation Technology.Zhongguo Jiguang/Chinese Journal of Lasers,47(10).
MLA	Y. Zang,Z. Xu,H. Xia,A. Huang,Y. He and R. Kan."Method for Measuring High Temperature Spectral Line Parameters Based on Calibration-Free Wavelength Modulation Technology".Zhongguo Jiguang/Chinese Journal of Lasers 47.10(2020).