System and method for calculating the directivity index of a...

Details System and method for calculating the directivity index of a... System and method for calculating the directivity index of a...

2007-07-27

2008-08-05

Lobo, Ian J (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Underwater system

C367S119000, C381S092000

Reexamination Certificate

active

07408841

ABSTRACT:
A software system and method is presented that calculates the sensor directivity at all spatial angles, and stores these values in a two dimensional matrix. These values are then used as additional “weighting” coefficients in the equation for the pressure detected by an array of directive sensors. The azimuthal and polar angles of a particular sensor normal vector are used to “rotate” the sensor directivity matrix to account for the angular orientation of each sensor within the array. The software system receives as input sensor and array geometry, shading functions, sensor shape, array structure baffling, steering, and shading. A sensor can have the shape of a point, line, plane, volume, baffled ring, or circular plane piston. The sensors within the array can either be baffled by the array structure or retain their free field directivity response, and array as a whole can have steering or no steering.

REFERENCES:
patent: 6192134 (2001-02-01), White et al.
patent: 6826284 (2004-11-01), Benesty et al.
patent: 7218741 (2007-05-01), Balan et al.

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