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- W4385855445 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." @default.
- W4385855445 created "2023-08-17" @default.
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- W4385855445 date "2023-08-16" @default.
- W4385855445 modified "2023-09-27" @default.
- W4385855445 title "Four-Polarisation Camera for Anisotropy Mapping at Three Orientations: Micro-Grain of Olivine" @default.
- W4385855445 doi "https://doi.org/10.20944/preprints202308.1179.v1" @default.
- W4385855445 hasPublicationYear "2023" @default.
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