Abstract
Free field, proud, and buried laboratory measurements of unexploded ordinance (UXO) are compared to at‐sea rail‐based measurements of the same UXO. The Laboratory for Structural Acoustics (LSA) at the Naval Research Laboratory consists of a 1 million gallon, deionized water, indoor cylindrical tank (17 m diam by 15 m deep) and an indoor rectangular tank (10 m by 8 m) laboratory, with a 3 m deep sand bottom and 4 m of water column. These pristine laboratory measurements are used to explore the physical acoustics of the sound‐structure interactions that can be used to validate models and to understand the structural acoustic features that may be measured in littoral environments. These laboratory results are compared and contrasted with measurements made on the same UXO in St. Andrews Bay near Panama City, Florida using a rail‐based synthetic aperture sonar (SAS). The structural acoustics responses of the UXOs in this shallow water, 8 m deep, sandy‐mud bottom environment are compared with the pristine results from the LSA. [Work supported by SERDP and ONR.]
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