Real-time vibration measurement by a spatial phase-shifting technique with a tilted holographic interferogram
Real-time vibration measurement by a tilted holographic interferogram is presented that utilizes the real-time digital fringe processor of a video signal. Three intensity data sampled at every one-third of the fringe spacing of the tilted fringes are used to calculate the modulation term of the frin...
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| Published in | Applied optics (2004) Vol. 36; no. 1; p. 281 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
United States
01.01.1997
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| Online Access | Get more information |
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| Summary: | Real-time vibration measurement by a tilted holographic interferogram is presented that utilizes the real-time digital fringe processor of a video signal. Three intensity data sampled at every one-third of the fringe spacing of the tilted fringes are used to calculate the modulation term of the fringe that is a function of a vibration amplitude. A three-dimensional lookup table performs the calculation in a TV repetition rate to give a new fringe profile that contours the vibration amplitude. Vibration modes at the resonant frequencies of a flat speaker were displayed on a monitor as changing the exciting frequency of vibration. |
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| ISSN: | 1559-128X |
| DOI: | 10.1364/AO.36.000281 |