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DAAD German Academic Exchange Service

A1 Colorimetric arrays

Project Leader

Prof. Dr. Markus Böhm, Prof. Dr. Otmar Loffeld

Initial Situation

Today's image-based systems in civil security almost exclusive rely on sensors which are either based on CMOS or CCD and work in a mono- or multi-chromatic way. For example, in the case of CCD sensors, four different photodiodes are merged to one image location. The decomposition of color is usually performed by a color filter array (Bayer pattern) which is attached to the sensor matrix and which features three or four different color filters and an appropriate resolution reduction for single colors. The spectral response of the semiconductor detector is invariant and defined by the manufacturing process.

Objectives and Work Plan

Variospectral diodes constitute an alternative technique. They are based on the technology of multi-spectral diodes, which capture the three basic RGB colors using a single multi-layer semiconductor diode. The development of appropriate variospectral diodes based on CMOS compatible technology for the detection of multi-spectral image data is the main objective of this subproject. The work plan covers four areas, specifically the electrical and optical modeling of variospectral diodes, the production of the assembly parts, the electrical and optical characterization of the manufactured sensors as single elements and their practical evaluation in the context of other subprojects, mainly in the projects B.1 and C.2.

Image sensor LARS

Sensitivity of a variospectral diode