In order to realize the non-contact measurement of three dimensional deformation of the tested object

the three dimensional deformation measurement system based on electronic speckle pattern interferometry(ESPI) is designed. In this designed system

the one-to-five type fiber is one part to dispart and propagate light.

which making the designed measurement system sample. Combining ESPI and the phase-shifting technique to get the quantitative deformation measurement. And PZT is used to shift the phase

the deformation results are calculated by “4+1” phase-shifting algorithm. The designed system can realize the in-plane and out-plane deformation measurement respectively

further

three dimensional deformation measurement of the tested object can be gotten. The experimental results of the in-plane

out-plane and three dimensional deformation for the wood block with defect and the steel plate with stress validate the designed system.