Archive image from page 47 of Directivity function of a general Directivity function of a general receiving array for spherical and plane sound waves directivityfunct00warn Year: 1961 APPENDIX D: PERTURBED CYLINDRICAL WAVE FRONT The function h(r,0) = r+g{0) represents the wave front of a radially expanding cylindrical wave emitted from the source P(x0, yo ) after some time t (fig. Dl). If g(0) = 0, then h(r,0) = r which is a cylindrical wave front in the plane. The quantities r and 0 are defined in the Ern coordinate system. SOURCE P(xo, yo) ELEMENT ixt,yt) Figure Dl. Source and perturbed

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Archive image from page 47 of Directivity function of a general Directivity function of a general receiving array for spherical and plane sound waves directivityfunct00warn Year: 1961 APPENDIX D: PERTURBED CYLINDRICAL WAVE FRONT The function h(r,0) = r+g{0) represents the wave front of a radially expanding cylindrical wave emitted from the source P(x0, yo ) after some time t (fig. Dl). If g(0) = 0, then h(r,0) = r which is a cylindrical wave front in the plane. The quantities r and 0 are defined in the Ern coordinate system. SOURCE P(xo, yo) ELEMENT ixt,yt) Figure Dl. Source and perturbed cylindrical wavefront passing through a typical element. 46

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