The present invention generally relates to high frequency piezoelectric crystal composites, devices, and method for manufacturing the same. In adaptive embodiments an improved imaging device, particularly a medical imaging device or a distance imaging device, for high frequency (>20 MHz) applications involving an imaging transducer assembly is coupled to a signal imagery processor. Additionally, the proposed invention presents a system for photolithography based micro-machined piezoelectric crystal composites and their uses resulting in improved performance parameters.

The present technology relates generally to portable acoustic holography systems for therapeutic ultrasound sources, and associated devices and methods. In some embodiments, a method of characterizing an ultrasound source by acoustic holography includes the use of a transducer geometry characteristic, a transducer operation characteristic, and a holography system measurement characteristic. A control computer can be instructed to determine holography measurement parameters. Based on the holography measurement parameters, the method can include scanning a target surface to obtain a hologram. Waveform measurements at a plurality of points on the target surface can be captured. Finally, the method can include processing the measurements to reconstruct at least one characteristic of the ultrasound source.

The present technology relates generally to portable acoustic holography systems for therapeutic ultrasound sources, and associated devices and methods. In some embodiments, a method of characterizing an ultrasound source by acoustic holography includes the use of a transducer geometry characteristic, a transducer operation characteristic, and a holography system measurement characteristic. A control computer can be instructed to determine holography measurement parameters. Based on the holography measurement parameters, the method can include scanning a target surface to obtain a hologram. Waveform measurements at a plurality of points on the target surface can be captured. Finally, the method can include processing the measurements to reconstruct at least one characteristic of the ultrasound source.

The invention provides an arrangement and a method for measuring the direct sound w.sub.rad radiated by an acoustical source under test (e.g. loudspeakers) under the influence of acoustic ambient noise sources Q.sub.1 and reflections at acoustical boundaries (e.g. room walls). An acquisition device measures a state variable p.sub.t(r.sub.m) of the sound field at a plurality of measurement points r.sub.m in a scanning range G.sub.m by a sensor and generates a scanned data set p.sub.G.sub.m.sub.,t.sup.Q.sup.0.sup.,Q.sup.1. Based on this data set an analyzer determines the coefficients C.sub.rad.sup.Q.sup.0 associated with expansion functions which are solutions of the wave equation. An identifier uses the scanned data set p.sub.G.sub.m.sub.,t.sup.Q.sup.0.sup.,Q.sup.1 for generating parameter information P for the analyzer which are the basis for separating the direct sound w.sub.rad from room reflections w.sub.ref and other waves w.sub.sec scattered at the surface of the source under test. An extrapolator predicts the state variable p.sub.rad.sup.Q.sup.0 of the direct sound w.sub.rad at any point outside the scanning range G.sub.m by using the coefficients C.sub.rad.sup.Q.sup.0 of the wave expansion.

The invention provides an arrangement and a method for measuring the direct sound w.sub.rad radiated by an acoustical source under test (e.g. loudspeakers) under the influence of acoustic ambient noise sources Q.sub.1 and reflections at acoustical boundaries (e.g. room walls). An acquisition device measures a state variable p.sub.t(r.sub.m) of the sound field at a plurality of measurement points r.sub.m in a scanning range G.sub.m by a sensor and generates a scanned data set p.sub.G.sub.m.sub.,t.sup.Q.sup.0.sup.,Q.sup.1. Based on this data set an analyzer determines the coefficients C.sub.rad.sup.Q.sup.0 associated with expansion functions which are solutions of the wave equation. An identifier uses the scanned data set p.sub.G.sub.m.sub.,t.sup.Q.sup.0.sup.,Q.sup.1 for generating parameter information P for the analyzer which are the basis for separating the direct sound w.sub.rad from room reflections w.sub.ref and other waves w.sub.sec scattered at the surface of the source under test. An extrapolator predicts the state variable p.sub.rad.sup.Q.sup.0 of the direct sound w.sub.rad at any point outside the scanning range G.sub.m by using the coefficients C.sub.rad.sup.Q.sup.0 of the wave expansion.

Method for computing the code for the reconstruction of three-dimensional scenes which include objects which partly absorb light or sound. The method can be implemented in a computing unit. In order to reconstruct a three-dimensional scene as realistic as possible, the diffraction patterns are computed separately at their point of origin considering the instances of absorption in the scene. The method can be used for the representation of three-dimensional scenes in a holographic display or volumetric display. Further, it can be carried out to achieve a reconstruction of sound fields in an array of sound sources.

Method for computing the code for the reconstruction of three-dimensional scenes which include objects which partly absorb light or sound. The method can be implemented in a computing unit. In order to reconstruct a three-dimensional scene as realistic as possible, the diffraction patterns are computed separately at their point of origin considering the instances of absorption in the scene. The method can be used for the representation of three-dimensional scenes in a holographic display or volumetric display. Further, it can be carried out to achieve a reconstruction of sound fields in an array of sound sources.

Systems and methods for acoustic simulation in accordance with embodiments of the invention are illustrated. One embodiment includes a method for simulating acoustic responses, including obtaining a digital model of an object, calculating a plurality of vibrational modes of the object, conflating the plurality of vibrational modes into a plurality of chords, where each chord includes a subset of the plurality of vibrational modes, calculating, for each chord, a chord sound field in the time domain, where the chord sound field describes acoustic pressure surrounding the object when the object oscillates in accordance with the subset of the plurality of vibrational modes, deconflating each chord sound field into a plurality of modal sound fields, where each modal sound field describes acoustic pressure surrounding the object when the object oscillates in accordance with a single vibrational mode, and storing each modal sound field in a far-field acoustic transfer (FFAT) map.