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|Title:||Vibration analysis and non-destructive testing with real-time shearography|
|Source:||Sim, C.W.,Chau, F.S.,Toh, S.L. (1995-02). Vibration analysis and non-destructive testing with real-time shearography. Optics and Laser Technology 27 (1) : 45-49. ScholarBank@NUS Repository.|
|Abstract:||Real-time laser speckle shearography coupled with vibration stressing is shown to be an effective means of vibration analysis and non-destructive testing. The shearograms are modulated by a system of live fringes. These fringes are shown to be described by the zeroth-order Bessel function of the first kind and their visibility decreases with increasing fringe order. In vibration analysis, the instantaneous fringe pattern depicts the out-of-plane surface displacement gradient of the object surface at various resonance modes. In non-destructive testing, the flaw depth in a component can be determined without having to determine fringe orders. There is good agreement between the results obtained using the method and those from theory and time-average holography. A major advantage of real-time shearography is its facility for continuous assessment of a vibrating object without the need for secondary shearogram reconstruction. © 1995.|
|Source Title:||Optics and Laser Technology|
|Appears in Collections:||Staff Publications|
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