Abstract
An in-plane radial sensitivity interferometer that uses the divergent illumination for displacement measurement in the radial direction is presented. A description and mathematical model for calculating the sensitivity vector are also presented. The interferometer has two polarizing filters: a circular one and a linear one to implement the phase stepping technique. A measurement of the radial deformation by thermal expansion is performed over an aluminium plate in order to test the interferometer. The results indicate that the maximum contribution of the out-of-plane with respect to the radial-in-plane sensitivity vector is less than 3% and decreases by less than 1% when measurements are performed near the optical axis. The measurement is compared with the results obtained by a finite element analysis on a virtual specimen model.
Highlights
Many studies employ Electronic Speckle Pattern Interferometry (ESPI) for the measurement of displacements, deformations, and surface shape
The technique is typically divided into two types of interferometers according to the main sensitivity vector direction of the optical system: in-plane and out-of-plane sensitivity interferometers
To diminish the measurement mistakes due to the wavefront of illumination, it is necessary keep the radial direction of the sensitivity vector consistent by using collimated illumination over the to keep the radial direction of the sensitivity vector consistent by using collimated illumination over full conic mirror surface
Summary
Many studies employ Electronic Speckle Pattern Interferometry (ESPI) for the measurement of displacements, deformations, and surface shape. To diminish the measurement mistakes due to the wavefront of illumination, it is necessary keep the radial direction of the sensitivity vector consistent by using collimated illumination over the to keep the radial direction of the sensitivity vector consistent by using collimated illumination over full conic mirror surface. This becomes increasingly expensive if the outer diameter of the conic the full conic mirror surface.
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