title: Punctuated quadrature phase-shifting interferometry.
abstract: We describe a method and algorithm for reducing the sensitivity of phase-shifting interferometry to external vibrations. Using an interline-transfer camera, a shutter, and a fast phase shifter, we acquire a series of paired interferograms in quadrature, with the pairs spaced to maximize residual phase-error cancellation. The rapid acquisition of quadrature pairs significantly improves resistance of interferometry to low-frequency vibrations.
authors: L L
authors: LL
authors: Deck
authors: P J
authors: PJ
authors: de Groot