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The computed tomography imaging spectrometer (CTIS) is a snapshot capable hyperspectral camera. A diffractive optical element is used to create multiple projections of the hyperspectral data cube side by side on the image sensor. A reconstruction algorithm computes the hyperspectral image from the spatio-spectral multiplexed signal. It solves a similar problem as the reconstruction algorithms used for computed tomography scanners. We present how such a system can be realized by a parallelized approach. Several apertures are placed next to each other. Each aperture creates only one projection using a grating prism.
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Simon Amann, Tobias Haist, Alexander Gatto, Markus Kamm, Stephan Reichelt, "Parallelized computed tomography imaging spectrometer," Proc. SPIE 12624, Digital Optical Technologies 2023, 126240M (7 August 2023); https://doi.org/10.1117/12.2676116