Phase Estimation in Optical Interferometry

Signal-Processing Methods in Phase-Shifting Interferometry ◾ 255

7.5 DUAL PZT IN HOLOGRAPHIC MOIRÉ

To recap, holographic moiré is essentially an incoherent superposition of

two interferometric systems that result in the formation of a moiré pat-

tern. Figure7.1b illustrates a typical optical setup for holographic moiré

[11]. In the optical setup, moiré carries information regarding the in-plane

displacement component along the x-direction, and the carrier carries

the information regarding the out-of-plane displacement component.

However, in a conventional holographic moiré setup, the information car-

ried by the carrier is lost if conve ...