Home Analyses & equipment Birefringence measurement of yarns (Senarmont methode)

Birefringence measurement of yarns (Sénarmont method)

The overall orientation in yarns as induced by the spin-draw process can be quantified by measuring the birefringence (Dn). For the determination of the birefringence, 20 single filaments from a multifilament yarn are prepared in such a way that the cross-sections are cut under an angle of approximately 45°. A light microscope (Jenapol) equipped with a halogen light source, monochromator (l = 558.5nm), polarizer and a rotating graduated analyzer (Sénarmont compensator) is used to measure the phase difference of the incident monochromatic polarized light beam. This is visually expressed as an certain amount of black lines/bands on the sample (M) caused by speed differences of the propagating light in the anisotropic sample. The phase difference can be read out by using a compensator which is in our case a rotating graduated analyzer (Q).

Dn: birefringence
M: amount of bands (visually determined)
Q: phase difference [°]
I: wavelength of incident light beam [nm]
d diameter of the filament [mm]

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