Holographic Inspection for Debonds in Sonar Transducer Head Mass/Shroud Subassemblies

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1985
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Teller, Cecil
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Review of Progress in Quantitative Nondestructive Evaluation
Center for Nondestructive Evaluation

Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.

This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.

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Holographic imaging has been successfully used to detect bubbles in the face rubber and debonds between the rubber and metal on the face and sides of the head mass and shroud of sonar transducers.1-3 This work was done using holographic inspection equipment and techniques applied in the rubber tire industry. A considerable amount of baseline data exists for tires from which a determination of the seriousness of an observed defect can be made, but this is not yet the case for transducers. The relationship between the appearance of a holographic image and the impact of the indicated defect on the reliability and lifetime of the transducer is unknown. The basic questions are: How do debonds affect transducer lifetime? How should the fringe pattern of the holographic image be interpreted? What does the fringe pattern reveal about the size of the actual defect?

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Tue Jan 01 00:00:00 UTC 1985