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Proceedings Paper

Underwater Imaging By Laser : Target Discrimination By Polarization And Speckle Characteristics
Author(s): Bernard Le Jeune; Jack Cariou; Jean Lotrian
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Paper Abstract

In optical imaging by laser through sea-water, the polarization difference between the optical signals backscattered by the medium and reflected from the targets can improve visibility ; it is also possible to use polarization and speckle informations in order to discriminate different targets. In this experiment speckle patterns were used in different states of polarized labelling in partially polarized and coherent light. The time average Stokes parameters were measured to identify the polarization state of each pixel of the numerical images : different parameters using these observables are pre-sented in global images and histograms. A range gating technique underwater imaging system was used : a double Nd:YAG laser (spectral width : 0.01 nm ; pulse duration : 5 ns) and a pulsed digital camera (gate width : 10 ns). In conclusion a multiparameter imaging model for identification of immerged targets is possible using this underwater lidar system which takes into account the vector nature of the optical signal (intensity, frequency, Solarization, phase).

Paper Details

Date Published: 28 March 1989
PDF: 8 pages
Proc. SPIE 1029, Scattering and Diffraction, (28 March 1989); doi: 10.1117/12.950445
Show Author Affiliations
Bernard Le Jeune, Lab. Spectrometrie et Optique Laser (France)
Jack Cariou, Lab. Spectrometrie et Optique Laser (France)
Jean Lotrian, Lab. Spectrometrie et Optique Laser (France)

Published in SPIE Proceedings Vol. 1029:
Scattering and Diffraction
Hedzer A. Ferwerda, Editor(s)

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