中国物理B ›› 2016, Vol. 25 ›› Issue (11): 114202-114202.doi: 10.1088/1674-1056/25/11/114202
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
Qin-Bin Huang(黄秦斌), Xue-Mei Xu(许雪梅), Chen-Jing Li(李晨静), Yi-Peng Ding(丁一鹏), Can Cao(曹粲), Lin-Zi Yin(尹林子), Jia-Feng Ding(丁家峰)
Qin-Bin Huang(黄秦斌), Xue-Mei Xu(许雪梅), Chen-Jing Li(李晨静), Yi-Peng Ding(丁一鹏), Can Cao(曹粲), Lin-Zi Yin(尹林子), Jia-Feng Ding(丁家峰)
摘要: The expressions of the second harmonic (2f) signal are derived on the basis of absorption spectral and lock-in theories. A parametric study indicates that the phase shift between the intensity and wavelength modulation makes a great contribution to the 2f signal. A self-calibration wavelength modulation spectroscopy (WMS) method based on tunable diode laser absorption spectroscopy (TDLAS) is applied, combining the advantages of ambient pressure, temperature suppression, and phase-shift influences elimination. Species concentration is retrieved simultaneously from selected 2f signal pairs of measured and reference WMS-2f spectra. The absorption line of acetylene (C2H2) at 1530.36 nm near-infrared is selected to detect C2H2 concentrations in the range of 0-400 ppmv. System sensitivity, detection precision and limit are markedly improved, demonstrating that the self-calibration method has better detecting performance than the conventional WMS.
中图分类号: (Phase retrieval)