Abstract
The directivity of parametric difference frequency sound is narrower than that of linear sound with same frequency radiated from a sound source with same aperture size. In addition, the parametric difference frequency sound can propagate a long distance in a dissipative medium, because sound absorption at low frequency is less than those at usual ultrasound frequency for measurements and medical imaging. However, for applications of parametric difference frequency sound on measurements and imaging, that has the disadvantage of low spatial resolution because. In this study, we proposed the application of pulse compression technique with chirp signal to parametric difference frequency sound for the improvement of spatial resolution. Nonlinear propagation of ultrasound in water was numerically simulated to confirm the realization of compressed parametric difference frequency sound. A sound source at center frequency of 1 MHz was driven by up and down linear chirp signals to generate chirp difference frequency with band width of 100 to 400 kHz, and the autocorrelation function of generated difference frequency sound was calculate to archive pulse compression. The results indicated the realization of pulse compressed parametric difference frequency sound with desired pulse width which is inversely proportional to the band width.
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