Scientific Subject Matter Expert Support of Laser Sensing of Mines, IEDs and Explosives
Abstract
Acoustic/Seismic phenomenological sensing provides means of detection and/or classification of naval threats, several of which include land and marine vehicles, personnel, mines and IEDs, and explosive material residue. Traditionally, laser vibrometry has been developed to sense the acoustic signals associated with these threats. With the advancement of high speed lasers and fast digital cameras across the optical wavelength spectrum, whole field laser interferometric sensing of acoustic/seismic signals can now be accomplished in wide area/high tempo modes. The laser vibration sensing measurement configuration is either active or passive Ð i.e., with or without a source. Laser interferometric vibration sensors are acoustic sensors/measurements that use optics to read out the vibrational response and require thorough understanding of the acoustic phenomenology in addition to electro-optics principles. Traditionally airborne sound sources are used in conjunction with flyable interferometric sensors. When these sensors are mounted on ground-based platforms, acoustic variables including the sound incidence angle and vibration readout angle change. Ground-based platforms allow the possibility of mechanically-coupled vibrational sources in addition to conventional loudspeakers. Physical understanding and verification of responses are necessary to interpret interferometric measurements. When targets are acoustically excited, the acoustic impedance or frequency response of the target is key to understanding the vibrational response the laser read-out signature. Acoustical characterization of a targetÕs response to sound is used to model the vibrational response of the target. It is this vibrational response that the interferometer responds or yields detection and characterization information of the target. The University of Mississippi proposes to support target characterization modeling and measurements, support acoustic and mechanical sources designs and performance specifications and measurements, support flight and ground based tests by providing acoustic and seismic ground truth, and participate of ONR planning, programming and reviews, hardware design, flight and field tests, data collections, and analysis.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jun 10, 2016
- Source ID
- N000141612258
Entities
People
- James Sabatier
Organizations
- Office of Naval Research
- United States Navy
- University of Mississippi