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首页> 外文会议>Tenth International Conference on Photoacoustic and Photothermal Phenomena Rome, Italy 23-27 August 1998 >Measurement of the (v_2 + 2v_3_ band of methane by photoacoustic and long path absoption spectroscopy
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Measurement of the (v_2 + 2v_3_ band of methane by photoacoustic and long path absoption spectroscopy

机译：用光声和长波吸收光谱法测量甲烷的（v_2 + 2v_3_谱带）

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The optical abosption spectrum of the (v_2+2v+3) combination band of methane in the 1.33 mu m range was investigated by photoacoustic and FTIR long path spectrscopy. The photoacoustic measurements were performed with a commercial external cavity diode laser (ECDL) and a differential photoacoustic (PA) detector. The absorption spectrum was obtained by scamming the wavelenth of the ECDL through the 1317-1343 nm range of the methane (v_2+2v_3) band. A certified mixture of 1000 ppmV methoane in synthetic air was used in a continuous flow mode. A linear concentration dependence of the PA signal was observed in the region of 10-1000 ppmV CH_4. The absorption coefficients calculated from the measured sound pressure are in good agreement with the values given in the literature for several R-branch lines. Optical absorption measurements were performed with a long path white cell in combination with a FTIR spectrometer.
机译：用光声和FTIR长波光谱技术研究了甲烷（v_2 + 2v + 3）结合带在1.33微米范围内的光学吸收光谱。使用商业外腔二极管激光器（ECDL）和差分光声（PA）检测器进行光声测量。通过将ECDL的波长偏移到甲烷（v_2 + 2v_3）波段的1317-1343 nm范围，可以得到吸收光谱。经认证的合成空气中1000 ppmV甲烷的混合物以连续流动模式使用。在10-1000ppmV CH_4的区域中观察到PA信号的线性浓度依赖性。根据测得的声压计算得出的吸收系数与文献中针对多条R分支线给出的值非常吻合。与长距离白池结合FTIR光谱仪进行光吸收测量。

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