A large area of interest can be studied in great detail with all of the elements of that volume in focus. By double pulsing the laser, velocity information can also be obtained. MetroLaser has fielded holographic recording systems used to further the understanding of complex physical processes. These holographic systems are providing answers in research labs and industry where other diagnostic instruments have had limitations. Because the holographic process records the phase information of the light reflected from an object, structural changes can be visualized if two or more holograms are taken of an object before and after deformation.
Interference fringes show the magnitude and the location of localized deformation.
Interferometry can also be used to visualize gasdynamic and aerodynamic flows in shock tunnels and wind tunnels. In double pulse holographic interferometry two wavefronts are recorded in the same hologram and the resulting interferogram depicts the changes in flow between these two times. This differencing allows rejection of steady or slowly varying errors in the test facility. Another application of interferometry is in the field of Holographic non-destructive testing . A variety of customer supplied structural components can be evaluated in MetroLaser s non-destructive testing laboratory.