Emission polarization of roughened glass and aluminum surfaces

Jordan, David; Lewis, Gareth D.; Jakeman, E.

doi:10.1364/ao.35.003583

Cited by 38 publications

(14 citation statements)

References 9 publications

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“…Even if good reproducible rms slope values exist, researchers must then "assume" a type of distribution to apply the rms measurement to that distribution. For example, Jordan and Lewis report significant variance in the calculated LDOP for a series of roughened surfaces, depending on whether a Gaussian or Cauchy distribution is applied (7). Regardless of the difficulty inherent to measuring an accurate surface profile, it is not entirely clear that a simple geometric approach is truly valid when the dimensions of the facets are comparable or smaller than the emission wavelength, as is the case here.…”

Section: Discussionmentioning

confidence: 82%

“…Jordan and Lewis first reported both measured and calculated attenuated thermal emission over the waveband 10 to 11 µm for a series of roughened glass and aluminum substrates as a function of surface orientation and a measured slope distribution (7,8). In their report, they present a modified Fresnel model that effectively weights the predicted emissivity by the normalized slope distribution.…”

Section: Ldopmentioning

confidence: 99%

See 1 more Smart Citation

Measured Degree of Infrared Polarization for a Variety of Thermal Emitting Surfaces

Gurton¹,

Dahmani²,

Videen³

2004

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Approved for public release; distribution unlimited. ii REPORT DOCUMENTATION PAGEForm Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)June 2004 ARL-TR-3240 SPONSOR/MONITOR'S ACRONYM(S) 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) U.S. Army Research Laboratory 2800 Powder Mill Road Adelphi, MD 20783-1197 SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution unlimited. SUPPLEMENTARY NOTES ABSTRACTWe report on a series of parametric measurements designed to measure the attenuative effects that surface roughness and aerosol contamination play in reducing polarized thermal surface emission. In particular, we measure the spectrally resolved linear degree of polarization (LDOP) for a series of roughened borosilicate (Pyrex 1 ) glass substrates as a function of roughness parameter, Ra, root mean square slope, m, and the angle of observation, θ. Spectrally resolved LDOP is measured over the waveband region 4 to13 µm by a modified Fourier transform IR spectrometer in which a wire-grid polarizer and an achromatic quarter-wave plate are used in conjunction to measure all four Stokes parameters. A second set of measurements is conducted on similar smooth glass substrates that are subjected to varying degrees of dew formation and aerosol contamination. Test substrates are oriented at a high grazing angle of 80 degrees and placed in a closed chamber. Dew or attenuative particulates, i.e., carbon black, potassium bromide, or pollen particles, are allowed to condense/settle on the thermal emitting surface while a band-averaged LDOP is recorded with a long-wave polarimetric IR imaging system. Measured results are then compared with predictive calculations based on a weighted Fresnel relation.

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Section: Discussionmentioning

confidence: 82%

Section: Ldopmentioning

confidence: 99%

Measured Degree of Infrared Polarization for a Variety of Thermal Emitting Surfaces

Gurton¹,

Dahmani²,

Videen³

2004

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“…For calculation of the thermal transfer in the far-field regime, we can use the fact that the directional emissivity of the substrate is given by the e p (θ) = 1 − |R p (θ) | 2 and e s (θ) = 1 − |R s (θ) | 2 corresponding to the p and s polarizations, respectively 42 . Then the thermal transfer can be calculated based on how much the emitted power is absorbed by the periodic structure.…”

Section: Exact Theorymentioning

confidence: 99%

Near-field radiative thermal transfer between a nanostructured periodic material and a planar substrate

2015

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This paper provides a method based on rigorous coupled wave analysis for the calculation of the radiative thermal conductance between a layer that is patterned with arbitrary, periodically repeating features and a planar substrate. This method is applied to study the transfer from an array of beams with a rectangular cross section. The impact of the structure size and spacing on the thermal conductance are investigated. These calculations are compared to an effective medium theory, which becomes increasingly accurate as the structure sizes fall well below the relevant resonance wavelengths of materials and structures. Moreover, comparisons are made with a modified proximity approximation and the far-field approximation, which become valid for small and large spacings, respectively. Results show that new levels of control over the magnitude and spectral contributions to thermal conductance can be achieved with corrugated structures relative to planar ones. Specifically, we show for SiC arrays with rectangular cross sections and with the same filling fraction that the use of a smaller periodicity leads to a lowered far-field thermal transfer and an increased near-field thermal transfer. INTRODUCTION:

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“…The effect of surface roughness and observation angle on the degree of polarization of thermal radiation is also of interest for imaging purposes in the 10-to 11-μm band [88]. Heterodyne polarimetry can be used to measure the Faraday rotation for far-infrared laser radiation transmitted through tokamak plasma, to determine the poloidal field distribution, and subsequently to determine the current density profile, which plays a crucial role in plasma equilibrium and stability [89].…”

Section: Industry and Researchmentioning

confidence: 99%

Polarization Imaging

Mujat

2011

Advances in Optical Imaging for Clinical Medicine

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Emission polarization of roughened glass and aluminum surfaces

Cited by 38 publications

References 9 publications

Measured Degree of Infrared Polarization for a Variety of Thermal Emitting Surfaces

Measured Degree of Infrared Polarization for a Variety of Thermal Emitting Surfaces

Near-field radiative thermal transfer between a nanostructured periodic material and a planar substrate

Polarization Imaging

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