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1. EP1896871 - CONTRAST ENHANCEMENT BETWEEN LINEAR AND NONLINEAR SCATTERERS

Office European Patent Office
Application Number 06755621
Application Date 26.06.2006
Publication Number 1896871
Publication Date 12.03.2008
Publication Kind A1
IPC
G PHYSICS
01
MEASURING; TESTING
S
RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
15
Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
02
using reflection of acoustic waves
06
Systems determining position data of a target
08
Systems for measuring distance only
10
using transmission of interrupted pulse-modulated waves
G PHYSICS
01
MEASURING; TESTING
S
RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
7
Details of systems according to groups G01S13/, G01S15/, G01S17/127
02
of systems according to group G01S13/58
28
Details of pulse systems
285
Receivers
292
Extracting wanted echo-signals
G PHYSICS
01
MEASURING; TESTING
S
RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
7
Details of systems according to groups G01S13/, G01S15/, G01S17/127
48
of systems according to group G01S17/58
483
Details of pulse systems
486
Receivers
487
Extracting wanted echo signals
G PHYSICS
01
MEASURING; TESTING
S
RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
7
Details of systems according to groups G01S13/, G01S15/, G01S17/127
52
of systems according to group G01S15/58
521
Constructional features
G PHYSICS
01
MEASURING; TESTING
S
RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
7
Details of systems according to groups G01S13/, G01S15/, G01S17/127
52
of systems according to group G01S15/58
523
Details of pulse systems
526
Receivers
527
Extracting wanted echo signals
G PHYSICS
01
MEASURING; TESTING
S
RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
13
Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
02
Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
06
Systems determining position data of a target
08
Systems for measuring distance only
10
using transmission of interrupted pulse modulated waves
G01S 15/10
G01S 7/292
G01S 7/487
G01S 7/521
G01S 7/527
G01S 13/10
CPC
G01S 7/521
G01S 7/292
G01S 7/487
G01S 7/527
G01S 13/106
G01S 15/108
Applicants UNIV SOUTHAMPTON
Inventors LEIGHTON TIMOTHY GRANT
WHITE PAUL ROBERT
FINFER DANIEL CLARK
Designated States
Priority Data 0513031 25.06.2005 GB
2006002335 26.06.2006 GB
Title
(DE) KONTRASTVERBESSERUNG ZWISCHEN LINEAREN UND NICHTLINEAREN STREUERN
(EN) CONTRAST ENHANCEMENT BETWEEN LINEAR AND NONLINEAR SCATTERERS
(FR) AMELIORATION DE CONTRASTE ENTRE DIFFUSEURS LINEAIRES ET NON LINEAIRES
Abstract
(EN)
A method for creating an acoustic observation of a target volume, the method comprising the steps of transmitting a group of at least two acoustic pulses towards the target volume, receiving at least one detector an echo of the group scattered from the target volume, the echo having linear and nonlinear components, processing the scattered signal in such a way as to enhance at least part of the nonlinear component (and suppress the linear component) of the scattered signal in a signal P+, processing the scattered signal in such a way as to suppress at least part of the nonlinear component (and enhance the linear component) of the scattered signal in a signal P-, and producing a detection signal from a mathematical combination of the signals P+ and P-. The method can be used to suppress at least part of the non-linear component, and to enhance the linear component in order to improve the contrast of an image of an object located in water and surrounded by an oceanic bubble cloud, by utilising a ratio of signals P+ and P-. In other situations where bubbles are required to be enhanced in the image, such as in biomedical ultrasonics, the nonlinear component can be arranged to be enhanced, and the linear component suppressed, by utilising the ratio P-/P+.

(FR)
Procédé d'établissement d'observation acoustique de volume cible : transmission de série d'au moins deux impulsions acoustiques vers le volume cible, réception par un détecteur d'un écho correspondant diffusé par ledit volume, cet écho étant à composantes linéaires et non linéaires, traitement du signal diffusé de manière à augmenter au moins une partie de la composante non linéaire (et à supprimer la composante linéaire) du signal diffusé dans un signal P+, traitement du signal diffusé de manière à supprimer au moins une partie de la composante non linéaire (et à augmenter la composante linéaire) du signal diffusé dans un signal P-, et production d'un signal de détection à partir d'une combinaison mathématique de signaux P+ et P-. On peut ainsi supprimer au moins une partie de la composante non linéaire, et augmenter la composante linéaire de manière à améliorer le contraste d'une image d'objet se trouvant dans l'eau et entouré d'un nuage de bulles océaniques, en utilisant un rapport de signaux P+ et P-. Dans d'autres situations où une amélioration des bulles est requise à l'intérieur de l'image, par exemple pour les applications biomédicales ultrasonores, on peut prendre des dispositions pour augmenter la composante non linéaire et supprimer la composante linéaire, en utilisant le rapport P-/P+.

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