CALCULATION OF THE IMPULSE-RESPONSE OF A RIGID SPHERE USING THE PHYSICAL OPTIC METHOD AND MODAL METHOD JOINTLY

In this paper a practical method is proposed to calculate the acoustical response of a rigid sphere. This method combines the physical optic method, which gives good results at high frequencies, with the modal method, which is suitable at low frequencies. This gets around The problems that arise when only one of these methods is used, namely the failure of the physical optic method at low frequencies and the convergence difficulties of the modal method at high frequencies. Here, the impulse response (response to a Dirac pressure transmission) of a rigid sphere for a backscattering situation is calculated.