The spectral dispersion curve and the refractive index profiles of polypropylene fibre are determined. Multiple-beam Fizeau fringes, a two-beam interference Pluta microscope, a manual variable wavelength system and the automatic variable wavelength interference technique (VAWI) are used to compare the results. A comparison of the optical properties measured using these four techniques is outlined. Also, the advantages, accuracy and limitations of these techniques are dealt with. Microinterferograms are illustrated.
Hamza, A. A., Sokkar, T. Z. N., El-Farahaty, K. A., & El-Dessouky, H. M. (1999). Comparative study on interferometric techniques for measurement of the optical properties of a fibre. Journal of Optics A: Pure and Applied Optics, 1(1), 41-50. https://doi.org/10.1088/1464-4258/1/1/006