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Electro-optical sensor with automatic suppression of laser dazzling

: Ritt, Gunnar; Eberle, Bernd

Postprint urn:nbn:de:0011-n-2187155 (3.5 MByte PDF)
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Copyright 2012 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Erstellt am: 14.11.2012

Ebert, Reinhard R. (Ed.) ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Electro-Optical and Infrared Systems: Technology and Applications IX : Security + Defence; 24.09.-27.09.2012, Edinburgh, United Kingdom
Bellingham, WA: SPIE, 2012 (Proceedings of SPIE 8541)
ISBN: 978-0-8194-9282-1
Paper 85410P
Conference "Electro-Optical and Infrared Systems - Technology and Applications" <9, 2012, Edinburgh>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IOSB ()
sensor protection; laser dazzling; digital micromirror device; wavelength multiplexing

The progress in laser technology leads to very compact but nevertheless powerful laser sources. In the visible and near infrared spectral region, lasers of any wavelength can be purchased. Especially continuous wave laser sources pose a serious threat to the human eye and electro-optical sensors due to their high proliferation and easy availability. The manifold of wavelengths cannot be encountered by conventional safety measures like absorption or interference filters. We present a protection concept for electro-optical sensors to suppress dazzling in the visible spectral region. The key element of the concept is the use of a digital micromirror device (DMD) in combination with wavelength multiplexing. This approach allows selective spectral filtering in defined regions of interest in the scene. The system offers the possibility of automatic attenuation of dazzling laser radiation. An anti-dazzle algorithm comprises the analysis of the laser wavelength and the subsequent activation of the appropriate micromirrors of the DMD.