Device for the three-dimensional focusing of an ultrasonic beam
US5027820A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 6, 1989 |
| Grant date | Jul 2, 1991 |
| Priority date | — |
| Expiry date | Nov 6, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S128/916
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for the three-dimensional focusing of an ultrasonic beam, comprising: PA0 a phased array (100) has a cylindrical shape with a generatrix X'X, and which comprises M.times.N elementary transducers which are arranged in a curved matrix consisting off M rows extending parallel to X'X and N curved columns extending perpendicularly to said rows. PA0 A circuit (200) forms focusing planes P.sub.j which extend through X'X, which circuit is formed by: PA1 a multiplexer (201) which selects, for each column i, from the M.times.N signals received by the array (100), the m.sub.o signals S.sub.jk.sup.I supplied by the elementary transducers whose row number is j+k, where K=0, 1, . . . , m.sub.o -1, where m.sub.o is a given number respresenting the aperture width of the ultrasonic beam, and which also forms the sum S.sub.jk.sup.i of the signals S.sub.jk.sup.i and S.sub.jk.sup.i, m.sub.o -k-1 supplied by the elementary transducers which are symmetrically positioned with respect to the center of the aperture, and PA1 N identical focusing circuits (202.sub.i) which apply, for each column i, a phase-resetting delay .tau..sub.k to the signals S.sub.jk.sup.i and which form the sum S.sub.j.sup.i…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.