| 摘要 |
PROBLEM TO BE SOLVED: To easily measure birefringence of a uniaxially oriented light-transmissive article.SOLUTION: In a state where transmission axes of a polarizer and an analyzer arranged in parallel Nicols are fixed at a specific azimuthal angle &thetas;, preferably at 45°, with respect to an orientation axis of a measurement object, measurement light including multi-wavelength components is taken into an imaging spectrometer to measure a transmitted light spectral spectrum. calculated transmittance spectra Tcal(λ)(=I(&thetas;)/I(&thetas;)) are preliminarily obtained and prepared for a plurality of phase differences, and a transmittance spectrum Tobs(λ) of the measurement object is obtained, and a phase difference Rm corresponding to a calculated transmittance spectrum Tcal(λ) closest to the transmittance spectrum Tobs (λ) out of the calculated transmittance spectra Tcal (λ)is obtained, and the phase difference Rm is divided by a thickness t of the measurement object to obtain birefringence &Dgr;n as Rm/t. |
