System and method for determining vector acoustic intensity external to a spherical array of transducers and an acoustically reflective spherical surface
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorEarl G Williams
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Abstract
A system and computer implemented method for determining and displaying vector acoustic intensity fields based on signals from a rigid spherical array of acoustic sensors within a volume external to the array. The method includes a propagator with a ratio of Green's functions for the location within the volume and for the spherical array radius, and a Tikhonov regularization filter that uses the Morozov discrepancy principle on the measured noise variance and Fourier coefficients of the measured partial pressures with respect to reference accelerometer or microphone measurements.
Claims26
A system for determining vector acoustic intensity at locations in a volume external to a spherical array of microphones, the array of microphones having an acoustically reflective frame, the system comprising:
- an analog to digital converter for digitizing pressure data from each microphone in the spherical array and for digitizing data from at least one reference microphone or accelerometer exterior to the array;
- and
- a computer processor for determining the acoustic intensity at each location, the processor having computer software adapted to apply a propagator to spherical wave equations for pressure and velocity to determine the vector acoustic intensity,
- the propagator including a regularization filter and a ratio of Green's functions for the location r and for the spherical array radius a.
A computer implemented method for determining vector acoustic intensity at locations in a volume external to a spherical array of microphones, the array of microphones having an acoustically reflective frame, the method comprising:
- receiving from an analog to digital converter digitized pressure data from each microphone in the spherical array and digital data from at least one reference microphone or accelerometer exterior to the array;
- applying a propagator to spherical wave equations for pressure and velocity to determine the vector acoustic intensity,
- the propagator including a regularization filter and a ratio of Green's functions for the location r and for the spherical array radius a.
A non-transitory computer readable medium having stored thereon instructions for determining vector acoustic intensity at locations in a volume external to a spherical array of microphones, the array of microphones having an acoustically reflective frame, said instructions including steps for:
- receiving from an analog to digital converter digitized pressure data from each microphone in the spherical array and digital data from at least one reference microphone or accelerometer exterior to the array;
- and
- applying a propagator to spherical wave equations for pressure and velocity to determine the vector acoustic intensity,
- the propagator including a regularization filter and a ratio of Green's functions for the location r and for the spherical array radius a.
Dependencies are inferred from the claim text.