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1. WO1992000584 - METHOD AND APPARATUS FOR ACOUSTIC HOLOGRAPHIC IMAGING IN MARINE AND OTHER ACOUSTIC REMOTE SENSING EQUIPMENT

Publication Number WO/1992/000584
Publication Date 09.01.1992
International Application No. PCT/GB1991/001058
International Filing Date 28.06.1991
Chapter 2 Demand Filed 22.01.1992
IPC
G01S 15/89 2006.1
GPHYSICS
01MEASURING; TESTING
SRADIO 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
15Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
88Sonar systems specially adapted for specific applications
89for mapping or imaging
G10K 11/34 2006.1
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES;  METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
18Methods or devices for transmitting, conducting or directing sound
26Sound-focusing or directing, e.g. scanning
34using electrical steering of transducer arrays, e.g. beam steering
CPC
G01S 15/89
GPHYSICS
01MEASURING; TESTING
SRADIO 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
15Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
88Sonar systems specially adapted for specific applications
89for mapping or imaging
G10K 11/346
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
18Methods or devices for transmitting, conducting, or directing sound
26Sound-focusing or directing, e.g. scanning
34using electrical steering of transducer arrays, e.g. beam steering
341Circuits therefor
346using phase variation
Applicants
  • HERIOT-WATT UNIVERSITY [GB]/[GB] (AllExceptUS)
  • SHIPPEY, Geoffrey [GB]/[GB] (UsOnly)
  • McHUGH, Ronald [GB]/[GB] (UsOnly)
Inventors
  • SHIPPEY, Geoffrey
  • McHUGH, Ronald
Agents
  • FITZPATRICKS
Priority Data
9014544.229.06.1990GB
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND APPARATUS FOR ACOUSTIC HOLOGRAPHIC IMAGING IN MARINE AND OTHER ACOUSTIC REMOTE SENSING EQUIPMENT
(FR) PROCEDE ET APPAREIL D'IMAGERIE HOLOGRAPHIQUE ET ACOUSTIQUE UTILISËS DANS DES EQUIPEMENTS DE TELEMESURE ACOUSTIQUE MARINS ET AUTRES
Abstract
(EN) The invention relates to acoustic imaging methods and apparatus intended to improve the performance and reduce the cost and complexity of such methods and apparatus. Accordingly, the method comprises the steps of: (a) between periodic acoustic pulses sampling output signals from a plurality of transducer at a predetermined rate; (b) digitising and storing the samples; (c) for each pixel of an image (i) selecting a corresponding set of samples from each transducer; (ii) correcting each selected sample set by interpolation so that it is precisely aligned with the required time of flight from pixel point to transducer; (iii) deriving a composite signal representing the strength of the reflected pulse from the point; and (iv) deriving the intensity of the pixel from the composite signal. The apparatus comprises a sonar head (10), consisting of the transducers and a pulse transmitter, data acquisition and storage means (12), and data processing and image generation means (14).
(FR) L'invention se rapporte à des procédés et à un appareil d'imagerie acoustique destinés à améliorer les performances et à réduire le coût et la complexité de tels procédés et de tels appareils. Ainsi, le procédé consiste à: (a) échantillonner des signaux de sortie provenant d'une multiplicité de transducteurs à une vitesse prédéterminée et entre des impulsions acoustiques périodiques; (b) numériser et mémoriser les échantillons; (c) pour chaque pixel d'une image (i) sélectionner un ensemble correspondant d'échantillons provenant de chaque transducteur; (ii) corriger chaque ensemble d'échantillons sélectionné par interpolation de sorte qu'il est précisément aligné avec le temps de trajet requis du point pixel au transducteur; (iii) dériver un signal composite représentant la puissance de l'impulsion réfléchie par le point; et (iv) déduire l'intensité du pixel à partir du signal composite. L'appareil comprend une tête de sonar (10) composée de transducteurs et d'un émetteur d'impulsions, de moyens d'acquisition et de mémorisation de données (12) et de moyens de traitement de données et de production d'images (14).
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