Special Section on Speckle-Based Metrology

Fully automated digital holographic interferometer for 360 deg contour and displacement measurements

[+] Author Affiliations
Ubaldo Uribe López, María del Socorro Hernández-Montes, Fernando Mendoza-Santoyo

Centro de Investigaciones en Optica, A.C., Loma del Bosque 115, León, Guanajuato 37150, México

Opt. Eng. 55(12), 121719 (Aug 03, 2016). doi:10.1117/1.OE.55.12.121719
History: Received April 28, 2016; Accepted July 8, 2016
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Abstract.  A fully automated optomechatronic system based on an out-of-plane sensitivity digital holographic interferometer is proposed to measure both the 360-deg object’s contour and its surface displacements due to sound stimulation. The digital holograms to measure the surface contour are acquired using the two points of illumination method whose optimal height sensitivity for this particular case is Δz=2.98  mm. This method renders a phase map that has a tilt produced by the angle change of the object beam relative to the optical axis, a tilt that is removed by subtracting the phase difference from a physical reference plane tangentially located at the back of the object, which contrasts with former methods that locate this plane usually in the middle portion of the object. By using rotation and averaging matrices, the 360-deg object’s contour digital reconstruction was obtained, and with it, the displacements around the object can be accurately placed on its surface. The main contribution of the proposed fully automated system is to get a 360-deg object’s contour and its surface displacements in a hands-free rapid and accurate evaluation.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Ubaldo Uribe López ; María del Socorro Hernández-Montes and Fernando Mendoza-Santoyo
"Fully automated digital holographic interferometer for 360 deg contour and displacement measurements", Opt. Eng. 55(12), 121719 (Aug 03, 2016). ; http://dx.doi.org/10.1117/1.OE.55.12.121719


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