Durry G, Megie G
Institut Pierre-Simon-Laplace, Service d'Aéronomie, Centre National de la Recherche Scientifique, BP 3, 91371 Verrières-le-Buisson Cedex, France.
Appl Opt. 1999 Dec 20;38(36):7342-54. doi: 10.1364/ao.38.007342.
The Spectromètre à Diodes Laser Accordables (SDLA), a balloonborne spectrometer devoted to the in situ measurement of CH(4) and H(2)O in the atmosphere that uses commercial distributed-feedback InGaAs laser diodes in combination with differential absorption spectroscopy, is described. Absorption spectra of CH(4) (in the 1.653-microm region) and H(2)O (in the 1.393-microm region) are simultaneously sampled at 1-s intervals by coupling with optical fibers of two near-infrared laser diodes to a Herriott multipass cell open to the atmosphere. Spectra of methane and water vapor in an altitude range of approximately 1 to approximately 31 km recorded during the recent balloon flights of the SDLA are presented. Mixing ratios with a precision error ranging from 5% to 10% are retrieved from the atmospheric spectra by a nonlinear least-squares fit to the spectral line shape in conjunction with in situ simultaneous pressure and temperature measurements.
本文介绍了可调谐二极管激光光谱仪（SDLA），这是一种用于大气中CH(4)和H(2)O原位测量的气球搭载光谱仪，它使用商用分布反馈InGaAs激光二极管结合差分吸收光谱技术。通过将两个近红外激光二极管的光纤耦合到一个通向大气的赫里奥特多程池，以1秒的间隔同时采样CH(4)（在1.653微米区域）和H(2)O（在1.393微米区域）的吸收光谱。文中展示了在SDLA最近的气球飞行期间记录的高度范围约为1至约31公里的甲烷和水蒸气光谱。通过结合原位同步压力和温度测量，对光谱线形状进行非线性最小二乘拟合，从大气光谱中反演得到精度误差在5%至10%之间的混合比。
