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Proceedings Article

Multispectral polarization active imager in the visible band

[+] Author Affiliations
Lenaic Le Hors, Pierre Hartemann

Thomson-CSF (France)

Sebastien Breugnot

Thomson-CSF (USA)

Proc. SPIE 4035, Laser Radar Technology and Applications V, 380 (September 5, 2000); doi:10.1117/12.397809
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From Conference Volume 4035

  • Laser Radar Technology and Applications V
  • Gary W. Kamerman; Upendra N. Singh; Christian Werner; Vasyl V. Molebny
  • Orlando, FL | April 24, 2000

abstract

We present the concept of a Multispectral Polarization Active Imager operating in the visible range. The acquisition of three degree of polarization (0% < Dp < 100%) images and three intensity images at different wavelengths (RGB) enables to get information about the spectral signature of targets as well as their polarization properties. A theoretical analysis and an experimental validation of this technique are presented. The device is operating in a monostatic configuration, using a white light source to illuminate the target. The reception system consists of a liquid crystal achromatic polarization rotator followed by a liquid crystal color filter and a CCD camera, all driven by a computer. The three polarization images can be merged in one by using a RGB coding in order to visualize the whole polarization information. Results with different targets will be presented, emphasizing polarization effects about backscattering. In particular the degree of polarization is found to be highly correlated to the reflectance of diffuse materials like paints, papers and other coatings. A first interpretation is given to explain this phenomenon. Application to identification of targets with low sensitivity to irradiance can be envisaged thanks to multispectral polarization signature.

© (2000) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Lenaic Le Hors ; Pierre Hartemann and Sebastien Breugnot
"Multispectral polarization active imager in the visible band", Proc. SPIE 4035, Laser Radar Technology and Applications V, 380 (September 5, 2000); doi:10.1117/12.397809; http://dx.doi.org/10.1117/12.397809


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