Prismatic imaging polarimeter calibration for the infrared spectral region

Kudenov, Michael W.; Pezzaniti, Larry; Dereniak, Eustace L.; Gerhart, Grant R.

doi:10.1364/oe.16.013720

Cited by 28 publications

(15 citation statements)

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“…Such a phase extraction can be achieved within a single snapshot using Fourier transform techniques. [13][14][15][16][17][18] Expressing Eqs. (1) and (2) in terms of the general spatial coordinates (x, y) yields I R ¼ aðx; yÞ þ bðx; yÞ cosð2πx∕p 0 Þ…”

Section: Background: Fringe Projectionmentioning

confidence: 99%

In situfringe projector development for thermal coating deposition

2014

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Abstract. Thermal barrier coatings (TBCs) and plasma spray coatings, in general, require fine control over the deposited thickness to achieve a reliable coating performance. Currently, the plasma spray industry quantifies thickness by sampling the part before and after TBC deposition. Approximate thickness is inferred from previous runs; however, process variability can cause errors in these approximations that result in wasted time and resources that can ultimately lead to nonreliant coatings. To this end, we present an in situ optical fringe projector technology that enables coating thickness measurements across a two-dimensional surface. The sensor is capable of achieving micron scale resolution in the harsh environment of a thermal spray booth. Furthermore, unlike the existing approaches, this technique is extendable to parts with complex geometries. The underlying background of the fringe projection method, including a differential measurement technique, is presented. Current results on production equipment and cylindrical parts are also discussed, showing good correlation and agreement with physical measurements captured in an industrial setting. © The Authors.Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Background: Fringe Projectionmentioning

confidence: 99%

In situfringe projector development for thermal coating deposition

2014

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“…The CLI polarimeter is calibrated by applying the reference beam calibration technique [4,8]. First, a forward 2D Fourier transformation is performed on the intensity pattern of Eq.…”

Section: Polarimeter Calibrationmentioning

confidence: 99%

“…White-light interference fringes generated in the central 100 × 100 pixels on the focal plane array for generating polarizer orientations of (a) θ ¼ 0°, (b) θ ¼ 50°, and (c) θ ¼ 90°. spatial frequency content of the scene, thereby reducing aliasing artifacts in the reconstructed Stokes parameters [8,22]. A raw image of a moving vehicle, captured with the CLI polarimeter pictured in Fig.…”

Section: Outdoor Measurementsmentioning

confidence: 99%

“…Specifically, we demonstrate a significantly more compact version of our white-light CIP, originally based on a modified Sagnac interferometer [6,7] or an achromatic Fourier transforming lens [8]. By incorporating polarization gratings (PGs) as a diffractive Savart plate, the functional form of the Sagnac interferometer's white-light fringes are preserved [9].…”

Section: Introductionmentioning

confidence: 99%

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White-light channeled imaging polarimeter using broadband polarization gratings

et al. 2011

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A white-light snapshot channeled linear imaging (CLI) polarimeter is demonstrated by utilizing polarization gratings (PGs). The CLI polarimeter is capable of measuring the two-dimensional distribution of the linear Stokes polarization parameters by incorporating two identical PGs, in series, along the optical axis. In this configuration, the general optical shearing functionality of a uniaxial crystal-based Savart plate is realized. However, unlike a Savart plate, the diffractive nature of the PGs creates a linear dependence of the shear versus wavelength, thus providing broadband functionality. Consequently, by incorporating the PG-based Savart plate into a Savart plate channeled imaging polarimeter, white-light interference fringes can be generated. This enables polarimetric image data to be acquired at shorter exposure times in daylight conditions, making it more appealing over the quasi-monochromatic channeled imaging polarimeters previously described in the literature. Furthermore, the PG-based device offers significantly more compactness, field of view, optical simplicity, and vibration insensitivity than previously described white-light CLI polarimeters based on Sagnac interferometers. Included in this paper are theoretical descriptions of the linear (S 0 , S 1 , and S 2 ) and complete (S 0 , S 1 , S 2 , and S 3 ) channeled Stokes imaging polarimeters. Additionally, descriptions of our calibration procedures and our experimental proof of concept CLI system are provided. These are followed by laboratory and outdoor polarimetric measurements of S 0 , S 1 , and S 2 .

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“…The amount of emission is based on each element's temperature. In Michael Kudenov's paper 12 , "Prismatic imaging polarimeter calibration for the infrared spectral region," he treats the calibration procedure for the system given in the following figure, This type of polarimeter is very similar to our system, because it too uses a spatially modulated image to back out the Stokes parameters. The basic system concept as far as the imaging polarimetry is the same, so calibration procedures for each will parallel each other.…”

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LWIR Snapshot Imaging Polarimeter

Sampson¹

2009

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Prismatic imaging polarimeter calibration for the infrared spectral region

Cited by 28 publications

References 10 publications

In situfringe projector development for thermal coating deposition

In situfringe projector development for thermal coating deposition

White-light channeled imaging polarimeter using broadband polarization gratings

LWIR Snapshot Imaging Polarimeter

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