Unpolarized calibration and nonuniformity correction for long-wave infrared microgrid imaging polarimeters

Bowers, David L.; Boger, James K.; Wellems, David; Ortega, Stephen; Fetrow, Matthew P.; Hubbs, John E.; Black, Wiley T.; Ratliff, Bradley M.; Tyo, J. Scott

doi:10.1117/1.2911715

Cited by 27 publications

(10 citation statements)

References 20 publications

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“…33 Our group had been working to develop calibration strategies for the class of polarimeters referred to as microgrid or division of focal plane polarimeters. 34 As we began to understand the calibration needs, we were confronted with residual image artifacts due to the then-understood operation of these instrument. At the time, the microgrid instruments were processed using a conventional DRM formalism on a 2 × 2 superpixel.…”

Section: Modulated Polarimeters As Channeled Systemsmentioning

confidence: 99%

Bandwidth and information in the design and analysis of polarimeters

Tyo

Alenin

2015

SPIE Proceedings

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Polarimeters operate by making polarization-dependent alterations in the intensity of the optical field. Modulated polarimeters introduce controlled fluctuations as a function of time, spatial position, wavelength, angle of incidence, or any other independent variable. These fluctuations create channels in frequency space that can be used to carry the polarimetric information. Since polarimeters are then inherently multiplexed information systems, issues of noise, bandwidth, channel cross-talk, and system conditioning become immediately important. This paper reviews much of the work over the past two decades on polarimeter design, and presents some of the most recent work on hybrid and non-periodic modulation schemes that hold out potential for maximizing system bandwidth.

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Section: Modulated Polarimeters As Channeled Systemsmentioning

confidence: 99%

Bandwidth and information in the design and analysis of polarimeters

Tyo

Alenin

2015

SPIE Proceedings

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“…Powell and Gruev described two calibration techniques tailored to mitigate variations in the optical response between pixelated-polarization filters across an imaging array [9]. Bowers et al investigated the calibration method for long wavelength infrared microgrid polarimeters [10]. Ratliff and co-workers investigated the IFOV error of microgrid polarimeters and the interpolation strategies to reduce it [11,12].…”

Section: Introductionmentioning

confidence: 99%

Calibration method of microgrid polarimeters with image interpolation

2015

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Microgrid polarimeters have large advantages over conventional polarimeters because of the snapshot nature and because they have no moving parts. However, they also suffer from several error sources, such as fixed pattern noise (FPN), photon response nonuniformity (PRNU), pixel cross talk, and instantaneous field-of-view (IFOV) error. A characterization method is proposed to improve the measurement accuracy in visible waveband. We first calibrate the camera with uniform illumination so that the response of the sensor is uniform over the entire field of view without IFOV error. Then a spline interpolation method is implemented to minimize IFOV error. Experimental results show the proposed method can effectively minimize the FPN and PRNU.

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“…In general for imaging polarimeters, it is necessary to perform calibration [44][45][46][47][48][49][50][51][52] to account for polarization aberrations. For each pixel and wavelength, calibration is performed to find the actual values of the system matrix.…”

Section: Introductionmentioning

confidence: 99%

Polarization calibration with large apertures in full field of view for a full Stokes imaging polarimeter based on liquid-crystal variable retarders

Zhang

Zhao

2013

Appl. Opt.

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Currently, polarization calibration for full Stokes imaging polarimeters is limited by the apertures of the retarders. In this paper, an improved polarization calibration with large apertures in full field of view for full Stokes imaging polarimeters based on liquid-crystal variable retarders is proposed and investigated theoretically and experimentally. The experimental precision of polarization calibration is 1.7% for linear polarization states and 8.8% for circular ones for an imaging polarimeter with a 100 mm aperture and 10° field of view. The feasibility for full Stokes polarization image is also confirmed in experiment for identifying objects due to degree of polarization and degree of circular polarization images.

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Unpolarized calibration and nonuniformity correction for long-wave infrared microgrid imaging polarimeters

Cited by 27 publications

References 20 publications

Bandwidth and information in the design and analysis of polarimeters

Bandwidth and information in the design and analysis of polarimeters

Calibration method of microgrid polarimeters with image interpolation

Polarization calibration with large apertures in full field of view for a full Stokes imaging polarimeter based on liquid-crystal variable retarders

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