Design and implementation of imaging circuit for satellite-borne high dynamic range differential optical absorption spectrometer
Satellite-borne imaging Differential Optical Absorption Spectrometers typically operate in a po-lar,sun-synchronous orbit,capturing reflected light from the Earth to measure gas concentrations via ab-sorption intensities at specific spectral lines. First-generation instruments often suffer from low dynamic range,leading to signal saturation in bright areas and insufficient readings in dim ones. The advent of ad-vanced image detectors with deeper full-well capacities and higher readout frequencies allows for the devel-opment of second-generation high-dynamic range instruments. This article details the design and implemen-tation of the imaging circuit for a high-dynamic range Satellite-borne imaging Differential Optical Absorp-tion Spectrometer,including detector selection,design strategies,and real circuit testing and analysis. The article elaborates on high-dynamic range design,introduces the concept of maximum measurement value for a single point along with its calculation formula,analyzes the relationship between maximum sin-gle-point measurement value and dynamic range,and offers a method for evaluating detection capability in single-point measurements. Additionally,the article presents a strategy to further enhance dynamic range and serves as a reference for R&D in similar applications.
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维普
