Applications of electronic speckle interferometry (ESI) techniques for spacecraft structural components |
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Authors: | M V Rao R Samuel A Ananthan |
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Institution: | ISRO Satellite Centre, Structures group, Airport Road, Bangalore 560017, India |
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Abstract: | Laser-based electronic speckle interferometry (ESI) techniques, viz., electronic speckle pattern interferometry (ESPI) and electronic speckle shearographic interferometry (ESSI) are used for testing of spacecraft structural components. The combined ESPI and ESSI system developed in house was successfully used for the non-destructive evaluation (NDE) of honeycomb sandwich panels and propellant tanks of Indian Space Research Organization (ISRO). Debonds between face sheet and the honeycomb core were identified using (i) thermal and (ii) dual vacuum stressing methods. On-line NDE of the propellant tanks under internal pressure loading for identification of the minute cracks and thickness reduction areas were successfully implemented by ESI. |
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Keywords: | Electronic speckle interferometry Non-destructive evaluation Debond identification |
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