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COMPUTED-TOMOGRAPHY IMAGING SPECTROMETER - EXPERIMENTAL CALIBRATION AND RECONSTRUCTION RESULTS

机译：计算机断层成像成像仪-实验校准和重建结果

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A temporally and spatially nonscanning imaging spectrometer is described in terms of computed-tomography concepts, specifically the central-slice theorem. A sequence of three transmission sinusoidal-phase gratings rotated in 60 degrees increments achieves dispersion in multiple directions and into multiple orders. The dispersed images of the system's field stop are interpreted as two-dimensional projections of a three-dimensional (x, y, lambda) object cube. Because of the size of the finite focal-plane array, this imaging spectrometer is an example of a limited-view-angle tomographic system. The imaging spectrometer's point spread function is measured experimentally as a function of wavelength and position in the field of view. Reconstruction of the object cube is then achieved through the maximum-likelihood, expectation-maximization algorithm under the assumption of a Poisson likelihood law. Experimental results indicate that the instrument performs well in the case of broadband and narrow-band emitters. [References: 21]
机译：根据计算机断层摄影的概念，特别是中央切片定理，对时空非扫描成像光谱仪进行了描述。三个以60度为增量旋转的透射正弦相位光栅的序列可实现多个方向和多个阶的色散。系统的视场光阑的分散图像被解释为三维（x，y，lambda）对象立方体的二维投影。由于有限焦平面阵列的大小，该成像光谱仪是有限视角层析成像系统的一个示例。成像光谱仪的点扩散函数是根据波长和视场中位置的函数进行实验测量的。然后，在泊松似然定律的假设下，通过最大似然，期望最大化算法来实现对象立方体的重构。实验结果表明，该仪器在宽带和窄带发射器的情况下性能良好。 [参考：21]

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