the present invention is connected with the holographic interferometry method and device that provides , to a very high precision , the reconstructing the original waveform of light emitted or reflected by an object . this method allows image resolution close to that of the wavelength of the light being used . the non - destructive method of holographic interferometry coupled with impulse heating of the test article to allow observation of its dynamic response to operating conditions , as described herein , is one of the most effective non - contact automated quality control methods available .