Spectrum data processing in optical-feedback cavity ring-down spectroscopy
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摘要: 在光反馈式腔衰荡光谱技术中，光谱数据的处理因一种特殊的光谱纹波现象而变得困难。以6 590.8~6 591.6 cm-1光谱范围内水汽分子的光反馈式腔衰荡光谱为基础，根据光谱纹波效应的特性分析结果，提出了一种简单的数据处理方法。利用该方法确定了6 590.871 cm-1处水汽分子吸收谱线的线宽约为0.100 3 cm-1，这与Hitran数据库提供的线宽结果仅有0.002 cm-1的误差，充分验证了该方法的有效性。Abstract: In optical-feedback cavity ring-down spectroscopy (OF-CRDS), the data processing of the measured spectrum is often a troubling problem for a special spectral phenomenon called spectral ripple. With an OF-CRDS example of H2O molecule in the spectral range of 6 590.8-6 591.6 cm-1, a data processing method based on the characteristics analyses of spectral ripple is demonstrated. The linewidth of the H2O molecule at 6 590.871 cm-1 is determined as about 0.100 3 cm-1 with this method and its difference compared to the calculated result from Hitran database is 0.002 cm-1, which verifies the effectiveness of this method.
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Key words:
- cavity ring-down spectroscopy /
- optical feedback /
- spectral ripple /
- data processing
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