Photoactivated Naphthalimide Compounds for Tissue Bonding

Identifying crack initiation in an aircraft structure through acoustic emission monitoring has been extensively used to predict the onset of damage. Currently, this technique is only applicable to external tests, as it requires ultrasonic transducers, noteasily embedded into the structure. There is a need for in-situ acoustic emission monitoring to further enable effective and objective maintenance and repair decisions.It is proposed that optical fiber Bragg grating sensors be used to monitor acoustic emission pulses with a high-speed optical demodulation system being developed by Blue Road Research. These fiber gratings are non-intrusive, allowing for them to be lefton the structure during service, for an in-situ acoustic emission monitoring system. This technology could be used to support damage assessment and health monitoring on a wide variety of aerospace platforms both military and commercial. It is also possible that this technology could be utilized on ships, bridges, and other structures.