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Title: Vibration analysis and non-destructive testing with real-time shearography
Authors: Sim, C.W.
Chau, F.S. 
Toh, S.L. 
Keywords: non-destructive testing
vibration analysis
Issue Date: Feb-1995
Citation: 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
ISSN: 00303992
Appears in Collections:Staff Publications

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