PARAMETRIC WAVEFORMS AND SPECTRA OF THE PRIMARY PULSES WITH TWO KINDS OF ENVELOPES

The integral of the pulse self-demodulation in acoustic parametric array can be calculated in light of the Fourier convolution theorem. Instead of a rectangular pulse with two discontinuous edges, two kinds of primary envelopes are used, the waveforms and their spectra are investigated. An optimal ratio of the primary duration has been found theoretically. Experimental results support this theory.