Spatial phase-stepping using a computer-generated diffractive optical element

Ramon Rodriguez-Vera; Bernardino Barrientos; Andrew John Moore

doi:10.1117/12.439207

11 September 2001 Spatial phase-stepping using a computer-generated diffractive optical element

Ramon Rodriguez-Vera, Bernardino Barrientos, Andrew John Moore

Proceedings Volume 4420, Laser Metrology for Precision Measurement and Inspection in Industry; (2001) https://doi.org/10.1117/12.439207
Event: Laser Metrology for Precision Management and Inspection in Industry, 2001, Florianopolis, Brazil

Abstract

A computer-generated diffractive optical element (DOE) is used in electronic speckle pattern interferometry (ESPI). This DOE is applied to calculate the interference phase corresponding to object deformation from a single TV frame. The system is utilized for static and transient deformation measurement with CW and pulse Nd:YAG lasers, respectively. The DOE is a modified phase computer generated hologram or cross grating. For transient deformation measurements the DOE does not need to be translated in order to introduce the phase change between diffracted fields. Thus, spatial phase- stepping becomes feasible and high-speed frame acquisitions do not limit real-time phase measurements. Experimental results for spatial phase-stepping with and without moving the DOE are given.

Citation Download Citation

Ramon Rodriguez-Vera, Bernardino Barrientos, and Andrew John Moore "Spatial phase-stepping using a computer-generated diffractive optical element", Proc. SPIE 4420, Laser Metrology for Precision Measurement and Inspection in Industry, (11 September 2001); https://doi.org/10.1117/12.439207

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