Summary of the technology
Moreover, we present a lens prototype in audible frequencies to demonstrate the validity of the modelling method. The applicability ranges from medical (non-incisive surgery, ecography, physiotherapy) and ultrasonics in general, to environmental acoustics.
The invention consists on the description of a new method to obtain acoustic lenses in different frequency ranges (audible and ultrasounds). The acoustic lenses are formed by an array of concentric rings in such a way that they have the ability to collimate an acoustic beam. The correct arrangement of the rings is calculated in a two-dimensional space by means an inverse design algorithm (Genetic algorithms).
The conventional acoustic lenses are based on the curvature of its surface for focusing sound thanks to the phenomenon of diffraction. By contrast, the lenses presented here are based on reflection of sound by elements (rings) scatterers distributed properly. This allows more margin for improvement in design and operation.
For example, here we describe the operation of a multi-focus lens capable of changing the focal length depending on the sound frequency. Furthermore, we present an example of operation of such a lens type at the audible frequency of 2200 Hz that validates the proposal.
Description of the technology
The research group on “Intelligent Computational Systems” of the university of Cadiz has developed in collaboration with researchers from Microelectronic Institute of Madrid (IMM-CSIC) and University of Valencia (UMDO) a novel methodology for construct acoustic lenses. The lenses are formed by scattering elements with radial symmetry permitting more flexibility in the design and an improvement in its performance.
This type of lens can be useful in medicine (ultrasonic non-incisional surgery) where the acoustic energy must be released in specific parts of the body at different deep. Also the acoustic lenses can be used to obtain threedimensional images by echography. On the other hand, the fact that the present invention is not limited to ultrasound, but it is also valid in the audible range, allows the use of acoustic lenses in the control and elimination of environmental noise.
Main advantages of its use
- By contrast, the lenses presented here are based on reflection of sound by elements (rings) scatterers distributed properly. This allows more margin for improvement in design and operation.
- The conventional acoustic lenses are based on the curvature of its surface for focusing sound thanks to the phenomenon of diffraction.
- Environmental acoustics
- Non-incisive surgery