Design and realization of a miniaturized high resolution computed tomography imaging spectrometer

Abstract

The computed tomography imaging spectrometer (CTIS) is a relatively unknown snapshot hyperspectral camera. It utilizes computational imaging approaches to gain the hyperspectral image from a spatiospectral smeared sensor image. We present a strongly miniaturized system with a dimension of only 36mm x 40.5mm x 52.8mm and a diagonal field of view of 29°. We achieve this using a Galilean beam expander and a combination of off-the-shelf lenses, a highly aspherical imaging system from a commercial smartphone and a 13 MP monochrome smartphone image sensor. The reconstructed hyperspectral image has a spatial resolution of 400 x 300 pixel with 39 spectral channels.

Real-time Hyperspectral Imaging in Hardware via Trained Metasurface Encoders

“…[43] [46] [47] (0.26 × 204)@0.03 [35] (0.17 × 164)@4 This work (12 × 204)@30 [42] (0.12 × 48)@5.2 [40] (0.04 × 46)@100 [39] (0.14 × 55)@100 [34] (0.03 × 117)@8 [41] (0.12 × 39)@16 (0.48×10 -3 × 468)@120 Hyperspectral snapshot Hyperspectral line scanner Multispectral (3×10 -3 × 300)@117 (f) Hyperspectral data of (solid yellow lines) artificial and (solid blue line) natural grapes. (g-h)…”

“…1). Faster hyperspectral and multispectral technologies with frame rates in the 100 Gb/s range reduce the spectral resolution by one order of magnitude [36][37][38][39][40][41][42]. At the same time, accurate one-dimensional scanners [43][44][45][46][47] do not meet the spatial resolution required to capture 2D image flows at video rates.…”

Monolithic mounting structures for robust optical systems through passive compensation of mechanical and thermal loads

“…5,6 It is increasingly used for optical applications, especially for the production of the optical elements. 7,8 However, larger elements usually require further post-processing steps of the optical surfaces and are not printable as monolithic multielement systems. 9,10 Nevertheless, larger optical systems can still benefit significantly by utilising the design freedom for their mounting structures to integrate new functions as well as optimize the system performance.…”