The problem of working out and creation of verification load device for testing mobile digital speckle-interferometers with the current-wave laser, that provides definition of normal deformation displacements is solved. The analytical expression linking difference in phase of interference fields of strained and initial states of object with an offset value of points of its surface. The results of investigation of strains of plates with different requirements of attaching and loading are given.
The problems of the development of mobile digital speckle interferometer with a cw laser to obtain the vibration characteristics of the full-size structures in factory laboratories. Given the results of the use of the mobile testing interferometer for the study of vibration characteristics of model samples of honeycomb panels, different way to connect mobile plate frame with power-trim. Considering the cellular plate as a system with distributed parameters provides a method to determine its natural frequencies and mode shapes by acoustic excitation. The experimental results are compared with those of serial laser Doppler vibrometers.
This paper presents the theoretical and experimental results of the analysis of the formation of the focused image in a double-exposure speckle photography. Theoretical analysis of the formation of the focused image in double-exposure speckle photography was carried out using the Vander Lugt method. It is shown that as a result of the summation of speckle structures displaced in the space of the photographic plates, moiré fringes are formed in double-exposure speckle photography. Experimental results confirming theoretical studies are presented.
The paper presents the results of a study showing the possibility of reducing the size of speckles to increase the sensitivity and accuracy of the measuring system based at the use of methods of speckle photography and speckle interferometry. The theoretical and experimental results the average size of speckles formed in the double-exposure specklegram depends on the aperture diaphragms of the optical system – circular aperture, annular aperture, square aperture and frame aperture – are presented. The experimental results forming of the diffraction halo and the Young’s fringes for a circular, annular, square and frame apertures are presented.
The paper deals with the processes that arise when sealing valve contact surfaces. A mathematical model of elastic contact is proposed that allows solving the problem of deformation of contacting surfaces with allowance for their rigidity by solving a system of linear equations and using the finite element method. To solve the problems of diagnosing and investigating the tightness of contact surfaces, a control and measuring system based on digital speckle interferometry with a continuous laser is proposed.
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