Transient deformation measurement with electronic speckle pattern interferometry by use of a holographic optical element for spatial phase stepping.
We have used a computer-generated holographic optical element (HOE) with electronic speckle pattern interferometry to calculate the interference phase corresponding to the deformation of a test object from a single TV frame. The HOE is a modified crossed phase grating that introduces a known phase change between the +/-1 diffracted orders, without being translated. The progressive propagation of transient mechanical waves was measured with an rms precision of 2pi/30.
Barrientos García
B
B
Centro de Investigaciones en Optica, Apartado Postal 1-948, Leon, Guanajuato, Mexico.
Moore
A J
AJ
Pérez-López
C
C
Wang
L
L
Tschudi
T
T