Birefringence Measurement by Polarised Light Microscopy
topic
Birefringence measurement of polyester: mount fibre in immersion oil on compensator stage polarised light microscope; rotate analyser to extinction (Bräce–Köhler compensator) or use tilting compensator (Berek type) to measure optical path difference Γ (nm). Δn = Γ/d (d=fibre diameter in nm). Accuracy: ±0.0005 Δn. Non-destructive, single fibre measurement. Alternative: optical fibre refractometry, prism coupling for oriented films.
Role
Birefringence measurement by polarised light microscopy is a key practical skill in fibre physics and textile science, directly quantifying molecular orientation. Understanding its optical basis (anisotropic refractive index) and procedure is essential for fibre structure research.
Ask AI about this topic
Understand
Apply
Explore
Learn
Watch & Learn
Loading videos…