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1. (WO2018178064) METHOD AND DEVICE FOR OBTAINING A PHASE SHIFTED SHEAROGRAM FOR SHEAROGRAPHY

Pub. No.:    WO/2018/178064    International Application No.:    PCT/EP2018/057750
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Wed Mar 28 01:59:59 CEST 2018
IPC: G01B 9/02
G01B 11/16
G01L 1/24
Applicants: TECHNISCHE UNIVERSITÄT MÜNCHEN
Inventors: WANG, Shengjia
Title: METHOD AND DEVICE FOR OBTAINING A PHASE SHIFTED SHEAROGRAM FOR SHEAROGRAPHY
Abstract:
A method for obtaining a phase shifted shearogram of a target for shearography comprising the steps of irradiating the target with a polarized coherent light beam from a polarized coherent light source, wherein a phase of at least one polarization component of the polarized coherent light beam is electrically modulated; passing a reflected beam, which is reflected from the target, through a polarization dependent optical retarder; splitting propagation directions of a first polarization component and a second polarization component of the reflected beam from a plurality of point sources of the target, the first polarization component being different from the second polarization component; and interfering the first polarization component from a first point source among the plurality of point sources and the second polarization component from a second point source among the plurality of point sources in an image plane, the first point source being different from the second point source.