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机载紫外DOAS成像光谱仪通过获取大气与地表的折射或散射的紫外光辐射,监测大气痕量气体的分布与变化,其电子学部件的重要组成部分为CCD成像电路。采用帧转移型面阵CCD-47-20为图像传感器,以现场可编辑门阵列(FPGA)为核心控制器的成像电路模块,设计并实现了一套完整的机载紫外光谱仪成像系统。CCD成像电路完成包括CCD驱动时序电路、CCD数据采集电路,接收CCD模拟图像信号产生数字图像信号,将数字图像信号通过差分芯片驱动以低压差分信号(LVDS)传输给机载通讯系统等功能。讨论了机载紫外成像光谱仪的设计过程,并重点讨论了CCD成像电路的设计过程。设计的机载紫外DOAS成像光谱仪系统成像分辨率为0.286°。实验证明满足大气污染气体的观测需求。
Airborne ultraviolet DOAS imaging spectrometer monitors the distribution and variation of trace gases in the atmosphere by capturing refracted or scattered UV radiation from the atmosphere and the earth’s surface. An important part of the electronics components is the CCD imaging circuit. A frame-transfer CCD-47-20 is used as the image sensor, and the imaging circuit module with field-programmable gate array (FPGA) as the core controller is designed and implemented. A complete airborne UV spectrometer imaging system is designed and implemented. The CCD imaging circuit includes the CCD drive timing circuit and the CCD data acquisition circuit, receives the CCD analog image signal to generate the digital image signal, and transmits the digital image signal to the airborne communication system through the low voltage differential signal (LVDS) driven by the differential chip. The design process of airborne UV imaging spectrometer is discussed, and the design process of CCD imaging circuit is discussed. The designed imaging system of airborne DOAS imaging system has an imaging resolution of 0.286 °. Experiments show that to meet the observation needs of air pollution gas.