3D Micro Laser Doppler Vibrometer to Characterize Ultrasonic Waves in Naval Structures
Abstract
This DURIP proposal requests funds to purchase a 3D Microsystem Laser Doppler Vibrometer to characterize the signal transfer to a structural health monitoring (SHM) network of sensors mounted to the surface of naval structures. In general the equipment will provide a state of the art platform for the measurement of ultrasonic wave transfer from materials to be inspected to ultrasonic transducers. Such information is also critical to other DOD applications such as the measurement of ultrasonic transducer responses in human tissue (such as for the measurement of the sources of traumatic brain injury).The equipment would support ongoing research at NCSU, sponsored by the Office of Naval Research to increase the quality of the signals received by the sensors and therefore the quality of the damage identification in the underlying naval structure. This characterization over a broad range of mounting parameters and configurations would permit the optimization of such sensor networks for military applications. By providing micro-scale, 3D displacement resolution, the equipment would provide both the in-plane and out-of-plane measurement of vibration amplitudes for ultrasonic waves in metallic structures and the vibration of the sensors in different excitation modes. These experiments would permit a quantitative measurement of the signal transfer between the host structure and the sensor that is not realizable to-date. The results of these experiments will be used to optimize the signal to noise ratio of various optical fiber sensor-mounting configurations for the nondestructive evaluation of the health of naval structures.The equipment requested in this DURIP proposal would enhance DOD relevantresearch and education at North Carolina State University. While the currentresearch efforts have qualitatively demonstrated the potential of remote bonding of FBG sensors for SHM applications based on ultrasonic waves, the new equipment would permit the optimization of such bonding configurations due to a quantitative understanding of the role of different mounting parameters on the signal transfer. Other sensor configurations could also be explored, always with the goal to increase the quality of signal transfer from the substrate structure to the sensor network. Beyond the ongoing ONR sponsored research efforts in the PI~s laboratory, the equipment will be housed in a laboratory to which other potential users at NCSU can gain access, so as to expand the availability of the measurement resources to other researchers working on DOD relevant research projects at NCSU. Graduate students at NCSU will be trained on the operation of the equipment and will gain experience through performing extensive measurements with the requested equipment.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jul 10, 2018
- Source ID
- N000141812240
Entities
People
- Kara Peters
Organizations
- North Carolina State University
- Office of Naval Research
- United States Navy