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针对QE65000光谱仪低噪声、紫外灵敏度高且尺寸小和重量轻等特点,开发了基于QE65000的差分吸收光谱(DOAS)遥测系统。首先研究了QE65000光谱仪探测器的偏置、暗电流以及暗电流与积分时间的关系,然后利用汞灯标定了光谱仪的波段范围和分辨率,并构建了基于QE65000的DOAS遥测实验装置,给出利用此系统测量的大气痕量气体吸收光谱和氙灯吸收谱,基于差分原理反演了大气中痕量气体的浓度,并给出测量误差和遥测系统探测低限。研究结果表明QE65000光谱仪应用于差分系统,为实现DOAS系统的小型化、便携化提供了可能。
For the QE65000 spectrometer with low noise, high UV sensitivity, small size and light weight, the QE65000 based differential absorption spectroscopy (DOAS) telemetry system was developed. Firstly, the relationship between bias, dark current, dark current and integration time of QE65000 spectrometer detector was studied. Then, the range and resolution of spectrometer were calibrated by using mercury lamp. A DOE telemetry experimental device based on QE65000 was constructed. This system measures the atmospheric trace gas absorption spectrum and the xenon lamp absorption spectrum. Based on the difference principle, the concentration of trace gas in the atmosphere is retrieved and the measurement error and detection limit of the telemetry system are given. The results show that the QE65000 spectrometer is used in differential system, which makes it possible to realize the miniaturization and portability of DOAS system.