A method for the simultaneous measurement of in-plane and out-of- plane deformation components of a deformation vector is demonstrated in this paper. In this method an object point is observed simultaneously in the directions of normal to the object surface and also at two symmetrical angles with respect to optical axis. A double exposure method is used to record the specklegram of the object under test in the image planes determined by the above mentioned directions of observation. This method allows us to study the in-plane and out-of-plane deformation simultaneously with comparable measuring sensitivity which is the order of the wavelength of the light. Experimental results on two different specimens are demonstrated.
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