基于超连续激光光源的细分光谱扫描定标方法研究

项目名称： 基于超连续激光光源的细分光谱扫描定标方法研究

项目编号： No.61505222

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 翟文超

作者单位： 中国科学院合肥物质科学研究院

项目金额： 20万元

中文摘要： 细分光谱扫描定标方法是遥感器高精度定标的重要手段。传统灯照明的单色仪光谱细分系统易操控但光通量低，限制了其在高精度定标中的应用；可调谐激光-积分球光谱扫描系统精度高但操作、维护复杂，在我国还受红外激光器匮乏等关键因素制约。超连续激光是一种新型的宽波段激光，应用潜力巨大，在我国具有良好的研究基础。本项目拟采用该光源与单色仪结合开展细分光谱扫描定标方法研究：（1）通过优化设计及高精度光谱、辐射标准溯源，构建高精度细分光谱定标实验平台；（2）通过细分光谱扫描，开展遥感器杂散光及带宽影响校正算法研究；（3）开展与宽波段光源定标方法比对研究，评估并校正两种定标结果的差异，实现两种定标方法溯源标准的统一及定标结果的一致。本项目所述的细分光谱扫描定标方法，预期波长定标精度优于0.1nm，辐射定标精度优于0.5%。本项目是新式光源在定标领域的应用尝试，为细分扫描定标方法探索新的技术途径，有望为我国太阳反射波段遥感器全谱段高精度定标提供支持。

中文关键词： 光谱响应；；细分光谱；杂散光校正；光辐射定标

英文摘要： The finely spectrally-resolved calibration method is a key technique for the highly accurate calibration of remote sensors. The traditional monochromator illuminated by a lamp is versatile but possesses low optical throughout which limit the application in the highly accurate calibration of remote sensors. The integrating sphere illuminated by tunable laser is highly accurate but complex ,and can just span limited band coverage in China, because of the lack of infrared lasers.The supercontinuum laser source is a very promising laser source with broad spectrum, lots of researches have been conducted and great achievements have been made in China. Thereby, the supercontinuum laser and the monochromator will be adopted and studied in this proposal. First, building a finely spectrally-resolved scanning calibration equipment with excellent performances through the optimal system design and highly accurate trace to the radiometric and spectral standards; Second, conducting the research on the correction of the stray light and bandpass effects for the remote sensors through the finely spectrally-resolved scan. Third , implementing the comparison with the calibration method based on the broadband source, evaluating and correcting the systemic differences between the two calibration methods to realize the compatibility of calibration results and traceability standards between the two calibration methods. The uncertainties of the calibration method in this proposal are expected to be less than 0.1nm for the spectral calibration and less than 0.5% for the radiometric calibration. The proposal is aimed at trying to demonstrate the usability of the supercontinuum laser in calibration domain, and developing a new method for the finely spectrally-resolved method to support the highly accurate calibration of the earth-viewing remote sensors operating in the solar reflective band in China.

英文关键词： spectral responsivity;spectrally-resolved;stray light correction;radiometric calibration