The diameter variation and refractive index inhomogeneity of a fused silica sphere were measured with a frequency-shifting Fizeau interferometer in a four-surface configuration. The phase-shifting algorithms to analyze the interference signals for each basic cavity were designed using the characteristic polynomial theory. We describe the experimental setup and preliminary results.
Proceedings Title: XX IMEKO World Congress; Metrology for Green Growth
Conference Dates: September 9-14, 2012
Conference Location: Busan, -1
Pub Type: Conferences
phase-shifting interferometry, characteristic polynomial, sphere measurement, diameter variation, refractive index inhomogeneity