Imaging Systems

High-speed degree-of-polarization imaging with a ferroelectric liquid-crystal modulator

[+] Author Affiliations
Albéric Jaulin

Université de Haute-Alsace,Ecole Nationale Supérieure d’Ingénieurs Sud Alsace, Laboratoire Modélisation Intelligence Processus Systèmes (EA 2332), 12, rue des Frères Lumière, 68093 Mulhouse Cedex, France

Laurent Bigué

Université de Haute-Alsace,Ecole Nationale Supérieure d’Ingénieurs Sud Alsace, Laboratoire Modélisation Intelligence Processus Systèmes (EA 2332), 12, rue des Frères Lumière, 68093 Mulhouse Cedex, France

Pierre Ambs

Université de Haute-Alsace,Ecole Nationale Supérieure d’Ingénieurs Sud Alsace, Laboratoire Modélisation Intelligence Processus Systèmes (EA 2332), 12, rue des Frères Lumière, 68093 Mulhouse Cedex, France

Opt. Eng. 47(3), 033201 (March 18, 2008). doi:10.1117/1.2894811
History: Received June 08, 2007; Revised October 10, 2007; Accepted November 03, 2007; Published March 18, 2008
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Images describing polarimetric characteristics of objects are more and more used when studying complex scenes. In some cases, only the depolarization phenomenon, mostly due to scattering, proves of interest and estimating the degree of polarization (DOP) is sufficient. For a linearly polarized beam under normal incidence, when the materials in the scene exhibit neither birefringence nor dichroism, this comes down to an intensity measurement in two crossed directions. Nevertheless, the classical optical setup, consisting mainly of a rotating polarizer used as a polarization state analyzer, gives good-quality images, but cannot provide dynamic information. In this paper, we propose to use a ferroelectric liquid-crystal modulator in an imaging polarimeter. We demonstrate the use of this modulator as a polarization state analyzer for frame rates up to about 400Hz. Provided a fast camera is used, we show that the polarimeter allows us to surpass the classical video frame rate. We propose a setup using a rapid CCD camera (up to 233Hz). Images in DOP are of very high quality and hold their own against images obtained with a classical polarizer. With a faster camera, we were able to obtain images at up to 400Hz.

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© 2008 Society of Photo-Optical Instrumentation Engineers

Citation

Albéric Jaulin ; Laurent Bigué and Pierre Ambs
"High-speed degree-of-polarization imaging with a ferroelectric liquid-crystal modulator", Opt. Eng. 47(3), 033201 (March 18, 2008). ; http://dx.doi.org/10.1117/1.2894811


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