Patent ID: 6172940
Filing Date: 2001-01-09
Classification: G01H,G10K

Abstract:
A method for measuring underwater acoustic intensity comprising the steps of:submerging a sensor comprising two passive geophones in a body of water, the geophones being in spaced relationship to each other and having sensing axes in alignment alone a common axis;exposing the geophones to an acoustic signal in said body of water;transmitting output signals from the passive geophones, through cable means directly to analyzing apparatus on the surface at a location remote from said sensor, said output signals being independent of each other when received by the analyzing apparatus and being proportional to the acoustic particle velocity components along said axis as measured by the respective geophones; andcomputing the acoustic intensity along said axis, by means of said analyzing apparatus, from the output signals transmitted through the cable means, by calculating, from said acoustic Particle velocity components, the imaginary part of the cross-spectrum between the geophones.