Abstract: Pulsed digital holography is very useful for vibration analysis. In order to increase the temporal resolution a ruby laser producing up to four pulses has been used. The separate digital holograms (one hologram for each pulse) of an object under test are recorded in few microseconds on three CCD sensors. The images of the recorded holographic interference patterns are captured digitally with a framegrabber inside a Personal Computer. The reconstruction of the holograms is performed digitally by means of computer. For the later quantitative evaluation of the reconstructed holograms, the Fourier method is used. The optical phase of each hologram is obtained from the complex amplitude and the deformation between two laserpulses is calculated from phase subtraction and phase unwrapping of these two holograms. Experimental results are presented. !16
展开▼
