Mr. Bolin Chen Profile

Bolin Chen

at Changchun Univ of Science and Technology

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Proceedings Article | 11 September 2013 Paper

Study on warning radius of diffuse reflection laser warning based on fish-eye lens

Bolin Chen, Weian Zhang

Proceedings Volume 8907, 89072Z (2013) https://doi.org/10.1117/12.2033180

KEYWORDS: Sensors, Signal to noise ratio, Imaging systems, Target detection, Optical filters, Vegetation, Reflection, Bidirectional reflectance transmission function, Laser applications, Staring arrays

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The diffuse reflection type of omni-directional laser warning based on fish-eye lens is becoming more and more important. As one of the key parameters of warning system, the warning radius should be put into investigation emphatically. The paper firstly theoretically analyzes the energy detected by single pixel of FPA detector in the system under complicated environment. Then the least energy detectable by each single pixel of the system is computed in terms of detector sensitivity, system noise, and minimum SNR. Subsequently, by comparison between the energy detected by single pixel and the least detectable energy, the warning radius is deduced from Torrance-Sparrow five-parameter semiempirical statistic model. Finally, a field experiment was developed to validate the computational results. It has been found that the warning radius has a close relationship with BRDF parameters of the irradiated target, propagation distance, angle of incidence, and detector sensitivity, etc. Furthermore, an important fact is shown that the experimental values of warning radius are always less than that of theoretical ones, due to such factors as the optical aberration of fish-eye lens, the transmissivity of narrowband filter, and the packing ratio of detector.

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