Stroboscopic ESPI methods for investigation of two-frequency vibrations
The given article describes a separated recording of two-frequency oscillations with the help of stroboscopic CCD camera operation and Nd-YAG laser. The recording and measurement of frequency components is performed with the help of the synchronized CCD camera acquisition mode. Synchronization and control of the camera was carried out by LabView-7.1 software and National Instruments hardware. The phases of the wave front are calculated from the recorded hologram by using the two-dimensional digital Fourier transform method. Experimental results are presented. Advantages and disadvantages of this method are discussed as well.