Single-Carrier-Frequency Spatial Phase Shift Shearography

doi:10.1117/3.2235244.ch7

Book: Digital Shearography: New Developments and Applications

Author(s): Lianxiang Yang, Xin Xie

Published: 2016

https://doi.org/10.1117/3.2235244.ch7

Author Affiliations +

Abstract

Because the multiple-channel spatial phase shift method needs a complex pixel alignment algorithm, a special image de-warping algorithm, and a complicated adjustment structure, this method is difficult to apply as an infield measurement tool for industry. Thus, in recent years, the singlecarrier-based spatial phase shift method has become the main trend of development for new SPS-DS systems. As mentioned, both Pedrini’s Mach–Zehnder-interferometer-based SPS-DS system and B. Bhaduri’s double-aperture SPS-DS system have the weakness of a small, limited measurement area. This chapter introduces a Michelson-interferometerbased SPS-DS system that uses a single frequency carrier.