A fiber optic fringe projection interferometer is proposed to obtain local amplitude vibration of a diffuse surface. A sinusoidal fringe pattern is projected onto the vibrating surface by an optical fiber version of Young's interferometer. An image of this surface is captured by a CCD camera and fed to a PC through a frame grabber and hence displayed onto a TV monitor. The visibility of the interference pattern is modulated by a function of the local amplitude of vibration. Thus loci of constant vibrational amplitude can be directly observed as regions of low fringe visibility in the image of the surface. A quantitative analysis is performed by a Fast Fourier Transform (FFT) algorithm. Experimental results in agreement with the theory are presented.
SCHIRRIPA SPAGNOLO, G., Paoletti, D., Ambrisini, D. (1997). Vibration monitoring by fiber optic fringe projection and Fourier transform analysis. OPTICS COMMUNICATIONS, 139, 17-23 [10.1016/S0030-4018(97)00045-X].
Vibration monitoring by fiber optic fringe projection and Fourier transform analysis
SCHIRRIPA SPAGNOLO, Giuseppe;
1997-01-01
Abstract
A fiber optic fringe projection interferometer is proposed to obtain local amplitude vibration of a diffuse surface. A sinusoidal fringe pattern is projected onto the vibrating surface by an optical fiber version of Young's interferometer. An image of this surface is captured by a CCD camera and fed to a PC through a frame grabber and hence displayed onto a TV monitor. The visibility of the interference pattern is modulated by a function of the local amplitude of vibration. Thus loci of constant vibrational amplitude can be directly observed as regions of low fringe visibility in the image of the surface. A quantitative analysis is performed by a Fast Fourier Transform (FFT) algorithm. Experimental results in agreement with the theory are presented.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
