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Protection concepts for optronical sensors against laser radiation

: Ritt, Gunnar; Eberle, Bernd


Huckridge, D.A. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Electro-optical and infrared systems: Technology and applications VIII : 21 - 22 September 2011, Prague, Czech Republic
Bellingham, WA: SPIE, 2011 (Proceedings of SPIE 8185)
ISBN: 978-0-8194-8813-8
Paper 81850G, 23 S.
Conference "Electro-Optical and Infrared Systems - Technology and Applications" <8, 2011, Prague>
Fraunhofer IOSB ()
sensor protection; laser dazzling; digital micromirror device; wavelength multiplexing

The rapid developments in the laser field through the last years led to very compact laser devices with high brightness. In the visual and near infrared spectral range practically each wavelength is now available. For optronical sensors, laser radiation states an increasing threat that cannot be encountered just by conventional safety measures like absorption or interference filters. We present a concept to protect imaging sensors against laser radiation of any wavelength. The system is based on the combination of a spatial light modulator and wavelength multiplexing and allows selective spectral filtering in a defined region of interest in the scene. Such a system offers the possibility to suppress annoying laser radiation without losing spatial information in the region of interest. Depending on the used imaging sensor, we discuss different ways to realize a control loop to activate the appropriate pixels of the spatial light modulator for the attenuation of the laser light.