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首页> 外文期刊>Applied optics >Feasibility study on 1.6 (mu)m continuous-wave modulation laser absorption spectrometer system for measurement of global CO_(2) concentration from a satellite
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Feasibility study on 1.6 (mu)m continuous-wave modulation laser absorption spectrometer system for measurement of global CO_(2) concentration from a satellite

机译：1.6μm连续波调制激光吸收光谱仪系统测量卫星中全球CO_（2）浓度的可行性研究

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摘要

A feasibility study is carried out on a 1.6 (mu)m continuous-wave modulation laser absorption spectrometer system for measurement of global CO_(2) concentration from a satellite. The studies are performed for wavelength selection and both systematic and random error analyses. The systematic error in the differential absorption optical depth (DAOD) is mainly caused by the temperature estimation error, surface pressure estimation error, altitude estimation error, and ON wavelength instability. The systematic errors caused by unwanted backscattering from background aerosols and dust aerosols can be reduced to less than 0.26percent by using a modulation frequency of around 200 kHz, when backscatter coefficients of these unwanted backscattering have a simple profile on altitude. The influence of backscattering from cirrus clouds is much larger than that of dust aerosols. The transmission power required to reduce the random error in the DAOD to 0.26percent is determined by the signal-to-noise ratio and the carrier-to-noise ratio calculations. For a satellite altitude of 400 km and receiving aperture diameter of 1 m, the required transmission power is approximately 18 W and 70 W when albedo is 0.31 and 0.08, respectively; the total measurement time in this case is 4 s, which corresponds to a horizontal resolution of 28 km.
机译：在1.6μm连续波调制激光吸收光谱仪系统上进行了可行性研究，以测量卫星的整体CO_（2）浓度。该研究用于波长选择以及系统和随机误差分析。差分吸收光学深度（DAOD）的系统误差主要由温度估计误差，表面压力估计误差，高度估计误差和ON波长不稳定性引起。通过使用大约200 kHz的调制频率，可以将背景气溶胶和粉尘气溶胶产生的有害背向散射引起的系统误差降低到0.26％以下，而这些有害背向散射的背向散射系数在海拔高度上很简单。卷云的反向散射影响远大于粉尘气溶胶。将DAOD中的随机误差降低到0.26％所需的发射功率由信噪比和载噪比计算确定。对于400 km的卫星高度和1 m的接收孔径，当反照率分别为0.31和0.08时，所需的发射功率分别约为18 W和70W。在这种情况下，总测量时间为4 s，对应于28 km的水平分辨率。

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