Abstract: The present invention relates to a flat-plate focusing ultrasonic transducer and an acoustic lens composed of an annular array piezoelectric element and methods of manufacturing and designing thereof, more particularly to a flat-plate focusing ultrasonic transducer composed of an annular array piezoelectric element, wherein the annular array piezoelectric element has a plurality of concentric regions which is concentrically arranged in a concentric circle shape with respect to a center point, the concentric region has ring shaped sound insulation regions and piezoelectric regions which are alternatively formed in a direction from the center point to a radius direction, so as to focus a sound wave near a focal point, wherein the piezoelectric regions are composed of a piezoelectric ring that is composed of a piezoelectric material and thus excites a sound wave, the concentric region is in a shape of a flat-plate of which both sides are flat and which has a constant thickness, and each radius of the plurality o

Abstract: The present invention relates to an ultra-thin acoustic lens for subwavelength focusing in a megasonic range and a design method thereof. More particularly, the present invention relates to a super-oscillatory planar ultra-thin acoustic lens for subwavelength focusing in the megasonic range, which includes a plurality of concentric regions arranged in a concentric shape with reference to the center point, wherein the concentric regions include a plurality acoustic insulation region for insulating incident acoustic waves, and a plurality of transmission regions for transmitting acoustic waves, the acoustic insulation regions and the transmission regions being formed alternatively in a radial direction from the center point so as to focus incident acoustic wave energy onto a subwavelength region.

Abstract: The present invention relates to a flat-plate focusing ultrasonic transducer and an acoustic lens composed of an annular array piezoelectric element and methods of manufacturing and designing thereof, more particularly to a flat-plate focusing ultrasonic transducer composed of an annular array piezoelectric element, wherein the annular array piezoelectric element has a plurality of concentric regions which is concentrically arranged in a concentric circle shape with respect to a center point, the concentric region has ring shaped sound insulation regions and piezoelectric regions which are alternatively formed in a direction from the center point to a radius direction, so as to focus a sound wave near a focal point, wherein the piezoelectric regions are composed of a piezoelectric ring that is composed of a piezoelectric material and thus excites a sound wave, the concentric region is in a shape of a flat-plate of which both sides are flat and which has a constant thickness, and each radius of the plurality o

Abstract: The present invention relates to an ultra-thin acoustic lens for subwavelength focusing in a megasonic range and a design method thereof. More particularly, the present invention relates to a super-oscillatory planar ultra-thin acoustic lens for subwavelength focusing in the megasonic range, which includes a plurality of concentric regions arranged in a concentric shape with reference to the center point, wherein the concentric regions include a plurality acoustic insulation region for insulating incident acoustic waves, and a plurality of transmission regions for transmitting acoustic waves, the acoustic insulation regions and the transmission regions being formed alternatively in a radial direction from the center point so as to focus incident acoustic wave energy onto a subwavelength region.

Abstract: The present invention is aimed at providing measurement method for vibration displacement using state variation principle which achieves real time implementation through super high-speed DSP or FPGA as well as improves precision as much as picometer level and at the same time saves memory capacity compared to conventional invention.

Abstract: The present disclosure relates to an acoustic lens using a Fresnel zone plate, a design method and a manufacturing method of the acoustic lens, a focusing ultrasonic transducer to which the acoustic lens is applied, and a manufacturing method of the focusing ultrasonic transducer. More specifically, an acoustic lens using a Fresnel zone plate which is applied to a focusing ultrasonic transducer. The acoustic lens includes a plurality of concentric regions which is concentrically disposed with respect to a center point. In the concentric region, a sound insulation region which blocks an entering sound wave and a transmission region which transmits the sound wave are alternately formed in a radial direction from the center point, and the entering sound wave is focused near a focal point.

Abstract: The present invention is aimed at providing measurement method for vibration displacement using state variation principle which achieves real time implementation through super high-speed DSP or FPGA as well as improves precision as much as picometer level and at the same time saves memory capacity compared to conventional invention.