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Automatic laser glare suppression in electro-optical sensors

: Ritt, Gunnar; Eberle, Bernd

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Sensors. Online journal 15 (2015), No.1, pp.792-802
ISSN: 1424-8220
Journal Article, Electronic Publication
Fraunhofer IOSB ()
laser dazzling; sensor protection; spatial light modulator; wavelength multiplexing

Progress in laser technology has led to very compact but nevertheless powerful laser sources. In the visible and near infrared spectral region, lasers of any wavelength can be purchased. Continuous wave laser sources pose an especially serious threat to the human eye and electro-optical sensors due to their high proliferation and easy availability. The manifold of available wavelengths cannot be covered 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.