Parallax-free IR and visible imaging under one lens

May 25, 2016 // By Julien Happich
Researchers at the Fraunhofer Institute for Photonic Microsystems (IPMS) in Dresden have developed a high-resolution camera which produces images combining two spectral ranges using multiple detectors through a single lens.

While systems currently available on the market use costly optics, materials and components individually adapted for various spectral ranges, the multi-spectral camera invented by Fraunhofer IPMS uses two image sensors behind a common lens designed as a special tilted mirror system.

By construction, the lens avoids the chromatic aberrations or central obscuration effects occurring in competing systems. Individual mirror surfaces have been designed in a partially aspheric manner to correct geometric aberrations and are provided with suitable coatings to ensure high reflectivity over a wide spectral range.

Because the camera captures information in different spectral ranges through a single lens, it delivers simultaneous parallax-free images that are simpler to process (no parallax corrections and overlay matching).

The choice of the spectral range of the reflective optics is then limited only by the detectors available. Fraunhofer IPMS researchers have now integrated the lens and image sensors with electronics and software in a first functional demonstrator that will be on exhibition at the Optatec International Trade Show for optical technologies, components and systems in Frankfurt from June 7-9.

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