14 January 2002 Modulated lidar system: experiment versus theory
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A modulated light detecting and ranging system has been developed to improve underwater imaging. This system uses the modulation information encoded on an optical signal to distinguish between the backscatter signal and the signal reflected from an underwater target. Through choice of the appropriate modulation frequency, this technique has the ability to improve underwater target contrasts by reducing backscatter noise. Both laboratory tank experiments and in- situ pier measurements have been completed with a modulated lidar prototype. The results show that the target contrast improved as the modulation frequency. Concurrent with the experimental measurements, a theoretical model is being developed for the modulated lidar system. This analytical model incorporates both the Small Angle Diffusion Approximation and the Multi-Component Method developed by Zege et al to solve the radiative transfer equation. The various experimental characteristics are included in the model and the results are compared with relevant experimental data. Preliminary results show good agreement with experimental data, including the reduction of backscatter with increasing modulation frequency.
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Linda J. Mullen, Linda J. Mullen, Eleonora P. Zege, Eleonora P. Zege, Iosif L. Katsev, Iosif L. Katsev, Alexander S. Prikhach, Alexander S. Prikhach, } "Modulated lidar system: experiment versus theory", Proc. SPIE 4488, Ocean Optics: Remote Sensing and Underwater Imaging, (14 January 2002); doi: 10.1117/12.452829; https://doi.org/10.1117/12.452829

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