Repozytorium publikacji - Politechnika Gdańska

The measurement of birefringence is useful for the examination of both technical and biological objects. One of the main problems is that the polarization state of light in birefringent media changes periodically. Without the knowledge of the period number, the birefringence of a given medium cannot be determined reliably. We propose to analyse the spectrum of light in order to determine the birefringence. We use a Particle Swarm Optimization algorithm for an automatic processing spectra of the light transmitted through a birefringent material for two orthogonal states of polarization. We have tested described algorithm on a liquid crystal cell with varying effective birefringence. The proposed method can be used for the measurement of uniaxial positive birefringence without knowing the number of retardation period or an approximate value of the measurement result. It makes it useful for automatic measurements, when hundreds or thousands of spectra need to be analysed.

Autorzy

• mgr inż. Maciej Kraszewski link otwiera się w nowej karcie ,
• dr inż. Marcin Strąkowski link otwiera się w nowej karcie ,
• dr hab. inż. Jerzy Pluciński link otwiera się w nowej karcie ,
• dr hab. inż. Bogdan Kosmowski link otwiera się w nowej karcie