1.517 μm附近水汽分子谱线加宽系数的腔衰荡光谱测量
Measurement of broadening coefficients of water vapor molecules near 1.517 μm with continuous-wave cavity ring down spectroscopy
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摘要: 以超低膨胀系数微晶玻璃为腔体，以分布反馈式激光器为光源，建立了一套等噪声测量灵敏度为3.2×10-9 cm-1的调腔式连续波腔衰荡光谱系统。应用该系统对1.517 μm附近(6 586.5~6 596.5 cm-1范围内)的7条水汽吸收谱线进行了实验研究，测得了这些谱线在氮气、空气环境下的谱线加宽系数。根据测得的结果，得到了此波段水汽的空气加宽系数与氮气加宽系数之比为0.896 9±0.068 7(3倍标准误差范围内)，并就测得水汽的谱线加宽系数与HITRAN2004数据库数据进行了比较。Abstract: In order to explore the relation between N2-broadening and air-broadening coefficients of water vapor molecules in near-infrared region, a high-sensitive continuous-wave cavity ring down spectroscopy, which used a glass-ceramic as the cavity and a distributed feedback diode laser as the light source, was applied to measure the spectral lines of water vapor molecules(near 1 517 μm in the spectral region of 6 586.5~6 596.5 cm-1), and the noise (RMS) equivalent absorption sensitivity of about 3.2×10-9 cm-1 was achieved. According to those measured broadening coefficients of water vapor molecules in air and in N2, their ratio is obtained as 0.896 9±0.068 7(within 3 times the standard deviation), which is in agreement with the resul
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