Implementation of a high-speed imaging polarimeter using a liquid crystal ferroelectric modulator

Jaulin, Albéric; Bigué, Laurent; Ambs, Pierre

doi:10.1117/12.661688

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…Analysis along two orthogonal states of polarization is often achieved by switching a polarization sensitive device such as a rotating linear polarizer [10], a liquid crystal-based polarization rotator [4], a variable retarder [11,12], or a ferroelectric modulator [13,14]. However, this type of approach has two drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Design and experimental validation of a snapshot polarization contrast imager

et al. 2009

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We present a degree of polarization imaging system based on a Wollaston prism and a single CCD camera. This architecture eliminates technical inaccuracies and noise sources that are present in experimental setups containing a polarization switching element. After the acquisition of two images corresponding to two orthogonal states of polarization, one can compute the orthogonal state contrast image (OSCI), which is an estimate of the local degree of polarization of the backscattered light when the observed materials are purely depolarizing. The instrument design coupled to an efficient calibration enables the estimation of the OSCI from a single image acquisition and significant reduction of technical noise present in other polarization imaging systems. The setup was tested in realistic conditions where it represents a real asset.

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Section: Introductionmentioning

confidence: 99%

Design and experimental validation of a snapshot polarization contrast imager

et al. 2009

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“…In this paper, we suggest the use of a single LM, as we already did 13,14 . This two-state configuration is often referred as Orthogonal State Configuration Imagery (OSCI) 15 .…”

Section: Optical Implementations Of Polarimetersmentioning

confidence: 81%

High-speed portable polarimeter using a ferroelectric liquid crystal modulator

Bigué¹,

Cheney²

2007

Polarization Science and Remote Sensing III

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The implementation of an imaging polarimeter able to capture dynamic scenes is presented. Our prototype is designed to work at visible wavelengths and to operate at high-speed, ie above 200 Hz, contrary to commercial or laboratory liquid crystal polarimeters previously reported in the literature. It has been used in the laboratory with controlled illumination conditions (wavelength, coherence or incoherence, incidence, …) as well as in a natural environment with sunlight or any lamp or light source. The device consists of commercial components whose cost is moderate. The polarizing element is based on a ferroelectric liquid crystal modulator which acts as a half-wave plate at its design wavelength. The device has been fully characterized and verified to work up to 1 kHz. It produces a 90° polarization rotation. In this Orthogonal State Configuration Imagery (OSCI), images in degree of polarization (DOP) can be obtained with simple postprocessing of two consecutive images. With a commercial CCD camera, operation up to 360 Hz is demonstrated, resulting in images whose quality is equivalent to that of classical low speed polarimeters.

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