Interferometry

Nondestructive testing with thermal waves using phase-shifted temporal speckle pattern interferometry

[+] Author Affiliations
Guillermo H. Kaufmann

Instituto de Fi´sica Rosario (CONICET-UNR), Bvd. 27 de Febrero 210 bis, S2000EZP Rosario, Argentina and Universidad Nacional de Rosario, Departamento de Fi´sica, Facultad de Ciencias Exactas, Ingenieri´a y Agrimensura, S2000BTP Rosario, Argentina E-mail: guille@ifir.edu.ar

Opt. Eng. 42(7), 2010-2014 (Jul 01, 2003). doi:10.1117/1.1579702
History: Received Oct. 30, 2002; Revised Dec. 2, 2002; Accepted Dec. 4, 2002; Online June 20, 2003
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A temporally modulated IR lamp is employed to heat the surface of a flawed plate and the resulting out-of-plane thermoelastic deflection is monitored using phase-shifted temporal speckle pattern interferometry. The speckle interferograms are continuously recorded by means of a high-speed digital camera with temporal phase shifting carried out by a Pockels cell synchronized with it. Temporal phase unwrapping through sequences of several hundreds of frames enables the determination of time-varying absolute displacement maps. Experimental results illustrate the possibilities of this novel nondestructive testing technique. © 2003 Society of Photo-Optical Instrumentation Engineers.

© 2003 Society of Photo-Optical Instrumentation Engineers

Citation

Guillermo H. Kaufmann
"Nondestructive testing with thermal waves using phase-shifted temporal speckle pattern interferometry", Opt. Eng. 42(7), 2010-2014 (Jul 01, 2003). ; http://dx.doi.org/10.1117/1.1579702


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