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随着光学遥感技术的发展,光谱辐射定标受到越来越多的关注。积分球渐渐成为紫外和可见波段辐射定标的主要工具,然而积分球存在无法输出单色光、稳定性不够持久等问题。为解决上述问题,提出一种基于双Féry棱镜色散相减结构的光谱辐照源的设计方法。该新型光谱辐照源的光谱范围为240~2400nm;光谱带宽在350、600、1000nm处分别小于3、9、29nm。经过光学设计软件Zemax设计和仿真,新型光谱辐照源的均匀度在Ф50mm范围内小于1.9%,在Ф30mm范围内小于1.4%,并且其系统偏振度小于0.7%。该辐照源可以用来测量探测器和光谱遥感仪器的光谱响应和几何定标。辐照源与起偏器连用可以测量仪器的偏振响应,具有广泛的实用。
With the development of optical remote sensing technology, spectral radiation calibration has received more and more attention. Integrating spheres have gradually become the main tool for scaling radiation in the UV and visible bands. However, integrating spheres have problems that they can not output monochromatic light and their stability is not long enough. In order to solve the above problems, a design method of spectral radiation source based on the dispersion subtraction structure of double Féry prism is proposed. The spectral range of the new spectral radiation source is 240 to 2400 nm; the spectral bandwidth is less than 3, 9 and 29 nm at 350, 600 and 1000 nm, respectively. After the optical design software Zemax was designed and simulated, the uniformity of the new spectral radiation source was less than 1.9% within Ф50mm, less than 1.4% within Ф30mm, and its system polarization was less than 0.7%. The radiation source can be used to measure the spectral response and geometric scaling of detectors and spectroscopic remote sensing instruments. The combination of irradiation source and polarizer can measure the polarization response of the instrument, and has a wide range of practical applications.