Initial results of a simultaneous Stokes imaging polarimeter

Leon, Erich de; Brandt, R.; Phenis, Adam; Virgen, Miguel

doi:10.1117/12.734938

Cited by 5 publications

(4 citation statements)

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“…The optical elements must be of high quality and the images must be mechanically or digitally registered. An apparently high-performance compact version has been proposed [ 63 ]; it allows access to all the linear polarization information. A simplified version consists of placing oneself in a monostatic configuration and analyzing only two crossed polarization components by dividing the beam using a Wollaston prism.…”

Section: Embedded Polarization Imagingmentioning

confidence: 99%

Passive Polarized Vision for Autonomous Vehicles: A Review

Serres,

Lapray,

Viollet

et al. 2024

Sensors

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This review article aims to address common research questions in passive polarized vision for robotics. What kind of polarization sensing can we embed into robots? Can we find our geolocation and true north heading by detecting light scattering from the sky as animals do? How should polarization images be related to the physical properties of reflecting surfaces in the context of scene understanding? This review article is divided into three main sections to address these questions, as well as to assist roboticists in identifying future directions in passive polarized vision for robotics. After an introduction, three key interconnected areas will be covered in the following sections: embedded polarization imaging; polarized vision for robotics navigation; and polarized vision for scene understanding. We will then discuss how polarized vision, a type of vision commonly used in the animal kingdom, should be implemented in robotics; this type of vision has not yet been exploited in robotics service. Passive polarized vision could be a supplemental perceptive modality of localization techniques to complement and reinforce more conventional ones.

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Section: Embedded Polarization Imagingmentioning

confidence: 99%

Passive Polarized Vision for Autonomous Vehicles: A Review

Serres,

Lapray,

Viollet

et al. 2024

Sensors

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“…It was mainly dedicated to static scenes with rotating waveplates or to quasi-static scenes with nematic liquid crystal devices. Alternatives able to capture dynamic scenes, but using much more complex optical setups, were also reported 9,10 . In this work, we aim at implementing a portable imaging Stokes polarimeter able to run at frame rates higher than 100 fps.…”

Section: Introductionmentioning

confidence: 97%

Stokes imaging polarimetry using a single ferroelectric liquid crystal modulator

2010

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We already implemented an imaging polarimeter able to capture at high-speed the full information about linear polarization of a monochromatic light beam (namely its first three Stokes parameters). The polarizing element was a single ferroelectric liquid crystal cell, acting as a half-wave plate (therefore as a polarization rotator) at its design wavelength. In this paper, we report the improvement of our system in order to grab the full Stokes information, including the fourth Stokes parameter. The procedure consists in two operations. First, optimally controlling our polarization component with an additional fourth voltage level. Second, shifting the wavelength operation in order to get benefit of the device chromatic behavior: away from its design wavelength, the device does not behave as a half-wave plate any longer, and with proper level control, the system matrix of our polarization state analyzer (consisting of the liquid crystal cell and of a fixed linear polarizer) can reach rank 4. Therefore, elliptical polarization can be fully analyzed, as it could be with a nematic liquid crystal device, but at a much higher frame rate. Results of operation at 200 fps are provided.

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“…It probably explains the reduced interest in imaging polarimetry, whereas polarization information, whether Stokes or Mueller information proves to be of interest in many fields such as chemistry, astronomy, atmospheric science, and medicine and proves to be an efficient analysis tool for many applications. Several architectures were proposed including division-of-time polarimeters, division-of-amplitude polarimeters 5,6 and division-of-wavefront systems 7 . The two latter solutions require either a complex optical setup or a very specialized component hard to manufacture.…”

Section: Introductionmentioning

confidence: 99%

Full Stokes polarimetric imaging using a single ferroelectric liquid crystal device

2011

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International audienceThis paper reports the design and the implementation of a Stokes imaging polarimeter able to provide full polarimetric information at 200 fps. This portable implementation is based on a division-oftime architecture and uses a single ferroelectric liquid crystal device as the polarization modulating element. Our system is designed to work at 532 nm with natural light or with controlled illumination, without temperature control. We propose an optimized driving scheme of the modulator such that the liquid crystal device can produce four polarization states which makes it possible to retrieve the full polarimetric information. The modulator characterization is reported and experimental results are provided

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Initial results of a simultaneous Stokes imaging polarimeter

Cited by 5 publications

References 0 publications

Passive Polarized Vision for Autonomous Vehicles: A Review

Passive Polarized Vision for Autonomous Vehicles: A Review

Stokes imaging polarimetry using a single ferroelectric liquid crystal modulator

Full Stokes polarimetric imaging using a single ferroelectric liquid crystal device

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