Concept, manufacturing and challenges of ultra-compact snapshot multi-spectral multi-aperture imaging systems

Abstract

Snapshot multispectral imaging is a rising non-invasive and contact-free analysis method and technology to discriminate or identify objects based on their spectral characteristics. We demonstrate a versatile system approach for compact and real-time capable snapshot cameras for the visible (VIS) and the near-infrared (NIR) or the short-wave infrared (SWIR) wavelength range based on a micro-optical multi-aperture system and various spectral filter approaches. In addition, the manufacturing, the calibration, and the limitations of the demonstration systems are described.

Intermediate image free computed tomography imaging spectrometer

“…Two other common snapshot techniques are the pixel-level filter array camera 12,13 and the multi-aperture filtered camera. 14,15 They are both based on spectral filters. CTIS on the other hand, does use a field stop in combination with a diffractive optical element (DOE) to acquire the hyperspectral image.…”

Parallelized computed tomography imaging spectrometer

“…Other commonly used snapshot hyperspectral cameras are the pixel-level filter array camera and the multi-aperture filtered camera. 3,4 We will first explain the basic working principle of a CTIS system. Afterward, we show a parallelized approach using multiple apertures that helps to overcome some of the issues that come with CTIS in section 2.…”