Model of backscattering light and signal light for atmospheric range-gated imaging systems

Details Model of backscattering light and signal light for atmospheric range-gated imaging systems Model of backscattering light and signal light for atmospheric range-gated imaging systems

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005spie.5633..128l&link_type=abstract

Advanced Materials and Devices for Sensing and Imaging II. Edited by Wang, Anbo; Zhang, Yimo; Ishii, Yukihiro. Proceedings of

Computer Science

Scientific paper

Based on the radiation transmission theory, a model of backscattering light and signal light for atmospheric range-gated imaging system has been developed. This model gives time dependent irradiance of backscattering light and signal light on photocathode during the propagation of illuminating pulsed laser in atmosphere. The model could be used to predict and optimize parameters of range-gated imaging systems. Examples with typical system parameters under fog conditions are computed with this model. The results can lead to several conclusions. The first one is that the photocathode irradiance of object image could be higher than that of the background even if optical signal power is lower than optical backscattering power. The second one is that increase in peak power of illumination laser could not improve the image contrast between an object and its background. The last one is that image contrast could be improved by reducing laser pulse width while keeping average laser power unvaried, reducing sensors" field-of-view, or increasing the separation between transmitter and receiver.

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