Speckle interferometry in situ: a feasibility study

Massimo Facchini

doi:10.1117/12.312950

30 June 1998 Speckle interferometry in situ: a feasibility study

Massimo Facchini

Proceedings Volume 3478, Laser Interferometry IX: Techniques and Analysis; (1998) https://doi.org/10.1117/12.312950
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

Speckle interferometry has been successfully used in many cases where a non-contact analysis of a surface's deformation state was required. This technique has been mostly applied in favorable environment, where the absence of vibrations and a reduced ambient illumination could be assured, and for the observation of areas being not in excess of some dm². When inspecting larger surfaces, all the problems related to the spatial resolution, to the limited sensitivity of the acquisition system, to the amount of illumination and to the extension of the observed area, should be taken into account. If the observed surface belongs to a structure directly positioned in-situ, problems of vibration, air turbulence, or ambient light saturation, become very restrictive for the application of the method. After a brief introduction about the theoretical principles of speckle interferometry, some main problems related to the inspection on quite large surfaces in-situ discussed. The problem is treated with the help of some simulations, possible solutions are proposed and some applications are presented. This work is the result of a joint collaboration between may institutes and research centers in the framework of a European project named VISILAS. Special fields of application foreseen for this project are civil engineering, aircraft industry, ship building and power plants for energy production.

Citation Download Citation

Massimo Facchini "Speckle interferometry in situ: a feasibility study", Proc. SPIE 3478, Laser Interferometry IX: Techniques and Analysis, (30 June 1998); https://doi.org/10.1117/12.312950

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