COMPUTED-TOMOGRAPHY IMAGING SPECTROMETER - EXPERIMENTAL CALIBRATION AND RECONSTRUCTION RESULTS
COMPUTED-TOMOGRAPHY IMAGING SPECTROMETER - EXPERIMENTAL CALIBRATION AND RECONSTRUCTION RESULTS
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DOI：
10.1364/ao.34.004817
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发表时间：
1995-08-01
期刊：
影响因子：
1.9
通讯作者：
DERENIAK, E
中科院分区：
文献类型：
--
作者：
DESCOUR, M;DERENIAK, E
时间和空间的非扫描成像光谱仪的计算机断层摄影的概念，特别是中心切片定理。以60度增量旋转的三个透射正弦相位光栅的序列实现了在多个方向和多个阶次上的色散。系统的视场光阑的分散图像被解释为三维（x，y，lambda）物体立方体的二维投影。由于有限焦平面阵列的尺寸，该成像光谱仪是有限视角层析成像系统的一个例子。成像光谱仪的点扩散函数作为波长和视场中的位置的函数进行实验测量。重建的对象立方体，然后通过最大似然，期望最大化算法的假设下的泊松似然法。实验结果表明，该仪器在宽带和窄带辐射源的情况下都有较好的性能。
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.