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This paper proposes a dual-function speckle interferometry system based on the temporal phase-shifting technique for both the digital speckle pattern interferometry (DSPI) and digital shearography (DS) measurement. The principle of the dual-function system has been described comprehensively based on the scalar diffraction theory. The simulation results show that the dual-function system which is based on the object beam multiplexing can simultaneously measure the out-of-plane displacement and slope under the single loading. The sensitivity of the out-of-plane displacement solved by the DSPI and DS method is discussed. Due to the error of the integration, the accuracy of the out-of-plane displacement calculation in DSPI is better than in DS. Finally, the dual-function speckle interferometry system has been proven effective in the edge detection of internal defects.

Simulation of dual-function speckle interferometry for the measurement of out-of-plane displacement and slope