Universal digital speckle shearing interferometer.
A speckle shear interferometer is presented which can be used to yield lateral, radial, rotational, and inversion shear fringes in real time in conjunction with a digital image processing system. A modification of the optical arrangement yields reversal or folding shear as well. Experiments are conducted on an edge-clamped diaphragm with concentrated load. Unit contrast fringes have been obtained by resorting to nonlinear processing techniques such as level slicing. The results are presented for various types of shear.
A R
AR
Ganesan
D K
DK
Sharma
M P
MP
Kothiyal