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首页> 外文期刊>Applied optics >IMPROVEMENT OF DIFFERENTIAL OPTICAL ABSORPTION SPECTROSCOPY WITH A MULTICHANNEL SCANNING TECHNIQUE
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IMPROVEMENT OF DIFFERENTIAL OPTICAL ABSORPTION SPECTROSCOPY WITH A MULTICHANNEL SCANNING TECHNIQUE

机译：用多通道扫描技术改进差分光学吸收光谱

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Differential optical absorption spectroscopy (DOAS) of atmospheric trace gases requires the detection of optical densities below 0.1%. Photodiode arrays are used more and more as detectors for DOAS because they allow one to record larger spectral intervals simultaneously This type of optical multichannel analyzer (OMA), however, shows sensitivity differences among the individual photodiodes (pixels), which are of the order of 1%. To correct for this a sensitivity reference spectrum is usually recorded separately from the trace-gas measurements. Because of atmospheric turbulence the illumination of the detector while an atmospheric absorption spectrum is being recorded is different from the conditions during the reference measurement. As a result the sensitivity patterns do not exactly match, and the corrected spectra still show a residual structure that is due to the sensitivity difference. This effect usually limits the detection of optical densities to approximately 3 x 10(-4). A new method for the removal of the sensitivity pattern is presented in this paper: Scanning the spectrometer by small wavelength increments after each readout of the OMA allows one to separate the OMA-fixed pattern and the wavelength-fixed structures (absorption lines). The properties of the new method and its applicability are demonstrated with simulated spectra. Finally, first atmospheric measurements with a laser long-path instrument demonstrate a detection limit of 3 x 10(-6) of a DOAS experiment. [References: 11]
机译：大气痕量气体的差分光吸收光谱法（DOAS）需要检测低于0.1％的光密度。光电二极管阵列越来越多地用作DOAS的检测器，因为它们允许同时记录更大的光谱间隔。这种类型的光学多通道分析仪（OMA）显示出各个光电二极管（像素）之间的灵敏度差异，约为1％为了对此进行校正，通常将灵敏度参考光谱与痕量气体测量值分开记录。由于大气湍流，记录大气吸收光谱时检测器的照度与参考测量期间的条件不同。结果，灵敏度模式不完全匹配，并且校正后的光谱仍然显示出由于灵敏度差异而导致的残留结构。这种效果通常将光密度检测限制在大约3 x 10（-4）。本文提出了一种去除灵敏度模式的新方法：在每次读取OMA之后，以较小的波长增量扫描光谱仪，从而可以将OMA固定模式和波长固定结构（吸收线）分开。通过模拟光谱证明了该新方法的性质及其适用性。最后，使用激光长距离仪器进行的首次大气测量表明，DOAS实验的检测极限为3 x 10（-6）。 [参考：11]

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