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15 July 2002 Built-in damage detection system for sandwich structures under cryogenic temperatures
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A built-in diagnostic system is being developed to identify de-bond between the skins and the honeycomb core of a sandwich structure. The system will be totally automated which will greatly reduce the time needed to inspect sandwich structures. The project is divided into two parts: Design and manufacturing of the sensors to detect damage and development of software to interpret the sensor data. Due to the extreme temperatures, most sensors will not survive the cryogenic temperatures of the inner skin where the damage is located. An array of sensors integrated in the sandwich panel is used to detect the damage. These sensors are embedded on the warmer side of the structure, but are able to probe for damage on the colder side of the tank. A cost-effective method is being developed to install these sensors without modifying the traditional sandwich manufacturing technique. The software compares the sensor and the baseline data. Based on the change in signal, it outputs the location and size of the damage.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Eric J. Blaise and Fu-Kuo Chang "Built-in damage detection system for sandwich structures under cryogenic temperatures", Proc. SPIE 4701, Smart Structures and Materials 2002: Smart Structures and Integrated Systems, (15 July 2002);

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