High-speed real-time holographic interferometry

The principle of holography was invented by Dr. Gabor in 1948 before the invention of the laser. In 1962,after the invention of laser(in 1960:the first demonstration of laser oscillation by Maiman was achieved using a rubycubic crystal), the off-axis reference beam holography was developed by Prof. Leith and Mr. Upatnieks. One of themost useful measuring techniques of the holography is a holographic interferometiy. Holography enable to storagesignal wave fronts and reconstruct it at later time, then the interference between the reconstructed signal wave frontsand the wave fronts come from the object to be able to generate a interference fringes. Real-time holographicinterferometry can measure real-time phase-change of phenomena. Therefore, this method has the performance ofcontinuously measuring phase change by coupling with high-speed cameras.Keywords: Holography, Interferomet,y, Laser, Real-time, Amplitude hologram, Phase holograniHigh-speed photography, Precise measuremenL