Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Four-Polarisation Camera for Anisotropy Mapping at Three Orientations: Micro-Grain of Olivine

Shuji Kamegaki
‡ ORCID logo ,
Daniel Smith
‡ ORCID logo ,
Meguya Ryu
ORCID logo ,
Soon Hock Ng
ORCID logo ,
Hsin-Hui Huang
,
Pegah Maasoumi
,
Jitraporn Vongsvivut
ORCID logo ,
Daniel Moraru
ORCID logo ,
Tomas Katkus
,
Saulius Juodkazis
* ,
Junko Morikawa
*
‡
These authors contributed equally to the work.
Version 1 : Received: 15 August 2023 / Approved: 16 August 2023 / Online: 16 August 2023 (09:33:23 CEST)

A peer-reviewed article of this Preprint also exists.

Kamegaki, S.; Smith, D.; Ryu, M.; Ng, S.H.; Huang, H.-H.; Maasoumi, P.; Vongsvivut, J.; Moraru, D.; Katkus, T.; Juodkazis, S.; Morikawa, J. Four-Polarisation Camera for Anisotropy Mapping at Three Orientations: Micro-Grain of Olivine. Coatings 2023, 13, 1640. Kamegaki, S.; Smith, D.; Ryu, M.; Ng, S.H.; Huang, H.-H.; Maasoumi, P.; Vongsvivut, J.; Moraru, D.; Katkus, T.; Juodkazis, S.; Morikawa, J. Four-Polarisation Camera for Anisotropy Mapping at Three Orientations: Micro-Grain of Olivine. Coatings 2023, 13, 1640.

Abstract

Four-polarisation camera was used to map absorbance of olivine micro-grains before and after high temperature annealing (HTA). It is shown that HTA of olivine xenolith at above 1200∘C in O2 flow makes it magnetised. Different mode of operation of polariscope with polarisation control before and after the sample in transmission and reflection modes was used. The reflection type was assembled for non-transparent samples of olivine after HTA. Sample for optical observation in transmission was placed on an achromatic plastic quarter-wavelength waveplate as a sample holder. Inspection for sample’s birefringence (retardance) as well as absorbance can be made. A best fit of transmitted intensity or transmittance T (hence absorbance A=−log10T) becomes accessible by simple best-fit using only three orientations (from measured four orientations by the camera). When intensity of transmitted light at one of the orientations was very low due to cross-polarised condition (polariser-analyser arrangement), the three-points fit can be used. Three-point fit in transmission and reflection modes was validated for T(θ)=Amp×cos(2θ−2θshift)+offset, where amplitude Amp, offset offset and orientation azimuth θshift are extracted for each pixel via the best fit.

Keywords

Anisotropy; polarisation analysis; Stokes parameters; polarimetry; olivine

Subject

Environmental and Earth Sciences, Remote Sensing

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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