1 August 2003 Comparison of acoustgraphy, ultrasonic spectroscopy, and c-scan ultrasonics as applied to the composite flywheels
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Abstract
The replacement of chemical batteries with composite flywheels offers many potential advantages in space applications. Before such flywheels can be successfully employed, it is imperative to ensure their integrity using NDE techniques. Previously, the use of traditional C-scan for the NDE of flywheels was compared to Scanning Ultrasonic Spectroscopy. However, both C-scan and scanning ultrasonic spectroscopy are point-by-point inspection techniques, and are thus inherently limited in inspection speed. In this paper, the application of Acoustography for the NDE of flywheels is reported. Acoustography provides an efficient and economical alternative to point-by-point ultrasonic scanning; in this approach a novel, wide area (AO) sensor is employed to provide full-field, real time ultrasonic images similar to x-ray imaging, significantly decreasing the required inspection time. Side by side images generated using Acoustography and traditional C-scan techniques for Plexiglas cylinder and a composite ring standard (both with known defects) are presented.
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Honghui Wang, Richard E. Martin, George Y. Baaklini, Jaswinder S. Sandhu, "Comparison of acoustgraphy, ultrasonic spectroscopy, and c-scan ultrasonics as applied to the composite flywheels", Proc. SPIE 5046, Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Composites II, (1 August 2003); doi: 10.1117/12.488052; https://doi.org/10.1117/12.488052
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