Backscatter linear and circular polarization analysis of roughened aluminum

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

doi:10.1364/ao.37.005985

Cited by 28 publications

(18 citation statements)

References 21 publications

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“…In addition, the experiment is conveniently modified by use of wave plates to investigate scattering for different polarization states (e.g. circular) [16] of the transmit laser beam.…”

Section: Discussionmentioning

confidence: 99%

Polarimetry of scattered light using heterodyne detection

Harris¹,

Wilson²,

Mallott³

et al. 1999

Journal of Modern Optics

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Heterodyne detection has been used to measure the polarization state of light back-scattered from various targets (including flame-sprayed aluminium, sandpaper and painted surfaces). The samples are illuminated with a linearly polarized single-frequency continuous-wave COz laser operating at a wavelength of 10.6 pm. The back-scattered co-polarized and cross-polarized components are both coherently detected by beating with an optical local oscillator. This process allows the relative amplitudes and phases of the two components to be measured and hence the light's polarization state can be evaluated. When the target undergoes movement, the scattered light demonstrates the usual properties of dynamic speckle, and the technique allows observation of the time evolution of the polarization ellipse.

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“…In addition, the experiment is conveniently modified by use of wave plates to investigate scattering for different polarization states (e.g. circular) [16] of the transmit laser beam.…”

Section: Discussionmentioning

confidence: 99%

Polarimetry of scattered light using heterodyne detection

Harris¹,

Wilson²,

Mallott³

et al. 1999

Journal of Modern Optics

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“…This is consistent with other reported results for similar sample types under similar measurement conditions. [8][9][10][11] Therefore, we will focus on the m 11 , m 22 , and m 33 diagonal components for the remaining analysis in this paper. …”

Section: Experiments Limitationsmentioning

confidence: 99%

Influence of sensing geometry on polarimetric reflectance data

2008

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Our objective is to disseminate the importance of sensing geometry when comparing reflectance data from different polarimeters. Results are presented from an eye-safe laser scatterometer that was used to measure the Mueller matrix of samples under a diversity of sensing geometries, thus providing a common reference for instrument comparison. Data from three other polarimeters are compared to this reference, and apparent discrepancies are explained in terms of each instrument's unique experimental sensing geometry. Results are also provided showing that the degree of sensing geometry dependence varied widely among sample types.

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“…For the optical/IR measurements, three bead-blasted and an unmodified aluminum surface were investigated 13,14 . The three aluminum surfaces (240mm x 130mm x 3mm) were bead-blasted at 5psi, 15psi and 90psi air pressures with 30µm alumina spheres.…”

Section: Aluminum Surface Characterizationmentioning

confidence: 99%

“…Table 2 shows how these physical parameters translate into roughness compared to a wavelength of the probing radiation. We shall consider data at two wavelengths, 0.6 and 10.6 µm, which match the experimental facilities 13,14 . We shall investigate whether the parameter ks can be recovered from the scattered field data using equation 12, which itself was obtained from the microwave experiments of figure 6.…”

Section: Aluminum Surface Characterizationmentioning

confidence: 99%

<title>Eigenvalue analysis of Mueller matrices for bead-blasted aluminum surfaces</title>

Cloude¹,

Lewis

2000

SPIE Proceedings

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This paper deals with the depolarization properties of rough surface back-scattering at visible and infra-red wavelengths. It is well known that rough surfaces depolarize incident light. In this paper we analyze the structure of surface depolarization using a coherency matrix approach and show that quantitative estimates of roughness may be obtained from a single Mueller matrix parameter, the scattering anisotropy A. Multi-spectral backscatter Mueller matrix data has been obtained for a set of controlled laboratory measurements on roughened Aluminum surfaces. The surfaces were manufactured using a bead-blasting process and the surface statistics have been carefully measured. We then applied a technique first developed for applications in radar scattering, which involves transformation of the Mueller matrix into a complex hermitian coherency matrix with subsequent eigenanalysis. These eigenvalues are then used to characterize the depolarizing properties of the surface. We show how important surface information is contained in the eigenvalue variation with angle of incidence and conclude as to the possibility for quantitative surface roughness measurements using this technique.

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Backscatter linear and circular polarization analysis of roughened aluminum

Cited by 28 publications

References 21 publications

Polarimetry of scattered light using heterodyne detection

Polarimetry of scattered light using heterodyne detection

Influence of sensing geometry on polarimetric reflectance data

<title>Eigenvalue analysis of Mueller matrices for bead-blasted aluminum surfaces</title>

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