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AssigneeThe Government of the United States of America, as represented by the Secretary of the Navy
InventorsAllen H. Reed, William M. Sanders, David C. Young
Estimating the term…
Embodiments relate to noncontact determination of nonlinearities. Initially, a first and second primary signal are preconditioned to produce a first and second tone capable of reaching a target granular media. Using a sound source, the first and second primary signals are emitted such that the first and second primary signals combine in a nonlinear fashion in the target granular media to produce low frequency acoustic tone that is a difference between the first and primary signals. An acoustic pulse is received by an acoustic receiver, and a quadratic nonlinearity coefficient and an acoustic pressure field are determined based on the acoustic pulse. At this stage, a sediment shear strength of the granular media is correlated to the quadratic nonlinearity coefficient to generate a shear strength lookup table.
An acoustic system, comprising:
An acoustic system, comprising:
A system for determining a quadratic nonlinearity coefficient, the system comprising:
Dependencies are inferred from the claim text.