METHOD FOR NON-CONTACT MEASUREMENT OF DEFORMATIONS OF LARGE OBJECTS BASED ON STRUCTURED LIGHTING
V. I. Guzhov, S. P. Ilinykh, E. E. Trubilina, D.S. Khaidukov
Novosibirsk State Technical University, Novosibirsk, Russia
Keywords: напряжённо-деформированное состояние объекта, интерферометрия, структурированное освещение, пошаговый фазовый сдвиг, stress-strain state of an object, interferometry, structured lighting, step-by-step phase shift
Abstract
A method for determining object deformations using structured lighting is considered. The method is based on the projection of pictures of sinusoidal bands on the surface of the object under study. By using a step-by-step phase shift, one can select information about the phase distribution, which contains data on the surface topography. Comparing the phase distributions before and after the impact on the object, one can determine the field of deformations. A new method for finding phase differences is presented, which significantly reduces the requirements to algorithms for eliminating phase ambiguity. An experimental setup is developed for determining the limit sensitivity of the method in studying deformations of a beam with one of its ends fixed. It is shown that the method sensitivity makes it possible to determine deformations for loads smaller than 10 microns at the free end of the beam.
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