Abstract
The use of complementary wavelength bands in camera systems is a long-known principle. The camera system’s spectral range is split into several spectral channels, where each channel possesses its own imaging sensor. Such an optical setup is used, for example, in high-quality three-sensor color cameras. A three-sensor camera is less vulnerable to laser dazzle than a single-sensor camera. However, the separation of the individual channels is not high enough to suppress cross talk, and thus, all three channels will suffer from laser dazzling. To solve that problem, we suggest two different optical designs in which the spectral separation of the channels is significantly increased. The first optical design is a three-channel camera system, which was already presented earlier. The second design is a two-channel camera system based on optical multiband elements, which delivers undisturbed color images even under laser dazzle.
Highlights
Laser protection has gained high importance mainly due to the worldwide distribution of compact, high-performance laser pointers, which are often misused to dazzle people and optical sensors.[1]
For comparison and in contrast to the transmittance measurements described in Sec. 4.1, we performed a measurement on our two-channel complementary wavelength bands” (CWBs) sensor in the same way as for the commercial off-the-shelf (COTS) devices
The reason the halogen light source could not be applied was that the spectral purity of these band-pass filters is just not good enough for cases with very high spectral separation larger than ∼50 dB
Summary
Laser protection has gained high importance mainly due to the worldwide distribution of compact, high-performance laser pointers, which are often misused to dazzle people and optical sensors.[1]. In order to evaluate the influence of optical nuisance, tests on human performance degradation under laser dazzle were carried out.[9,10] Regarding sensors, laser dazzling was intensively studied experimentally and theoretically by various groups.[11,12,13,14,15,16,17,18] The measurement of laser-induced damage thresholds of imaging sensors is an important and ongoing topic.[18,19,20]
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