Patent ID: 8410664
Filing Date: 2013-04-02
Classification: G10K

Abstract:
1. A method for changing ultrasound wave frequency by using piezoelectric acoustic matching layer having a specific thickness that being a half-wavelength of a characteristic ultrasound wave propagating within said piezoelectric acoustic matching layer itself, comprising: providing an ultrasonic probe; forming a piezoelectric acoustic matching layer by using poled lead zirconate titanate (PZT) plates with resonant frequencies selected from the group consisting of 1 MHz, 2 MHz, 3 MHz, and 5 MHz, said acoustic matching layer having a specific thickness being a half-wavelength of a characteristic ultrasound wave propagating within said acoustic matching layer itself; and combining said piezoelectric acoustic matching layer onto an ultrasonic probe for changing said ultrasound wave frequency as an output waveform, wherein said output waveform that being a frequency and its higher harmonic frequencies formed in accordance with a resonant frequency of said piezoelectric acoustic matching layer.