Linear Transducer Sonar for High-Quality Water Column Imaging
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Solution Overview
Problem
Conventional multibeam sonar systems are complex and costly, and sidescan sonar systems fail to provide high-quality images of the water column beneath a vessel, while cylindrical transducers offer poor quality for bottom or water column features.
Innovation Solution
A sonar system employing a linear transducer directed downward for high-quality images of the water column and bottom features, combined with sidescan transducers for improved imaging on both sides of the vessel, simplifying processing and reducing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multibeam sonar systems are used to provide high-quality sonar images, then imaging quality is improved, but device complexity and cost increase
Solution Approach 1:
The system divides the sonar imaging function into separate components: a linear transducer array for downscan imaging and sidescan transducers for lateral imaging. This segmentation allows each component to be optimized independently, reducing overall system complexity while maintaining high imaging quality through specialized functionality.
Solution Approach 2:
The patent transitions from conventional circular transducers that emit conical beams to linear transducers that emit planar fan-shaped beams. This dimensional change in transducer geometry fundamentally alters the beam pattern, enabling high-quality imaging of the water column and bottom features with simplified system architecture.
2Device complexity
If conventional cylindrical transducers are used for downscan imaging, then device simplicity is maintained, but imaging quality of water column and bottom features deteriorates
Solution Approach 1:
The system changes the fundamental parameter of transducer geometry from circular/cylindrical to linear configuration. This parameter change transforms the beam pattern from conical to planar fan-shaped, significantly improving imaging quality of water column and bottom features while maintaining reasonable system simplicity through the use of a single linear transducer array.
3Adaptability or versatility
If sidescan sonar systems are used to image water to the side of the vessel, then lateral imaging capability is improved, but imaging quality of water column beneath the vessel deteriorates
Solution Approach 1:
The linear transducer array is configured to perform multiple functions: it can image the water column beneath the vessel, image bottom features, and provide lateral coverage when combined with sidescan transducers. This multi-functionality allows a single transducer system to replace multiple specialized systems, improving overall versatility while maintaining high imaging quality across different targets.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides better quality sonar images for water column and bottom features beneath the vessel, enhancing imaging capabilities without the complexity and cost of multibeam systems, while offering detailed images of the water column and bottom structures.
Implementation Method 1
The transducers can convert electrical energy into sound energy and also convert sound energy (e.g., via detected pressure changes) into an electrical signal, although some transducers may act only as a hydrophone for converting sound energy into an electrical signal without having a transmitting capability. The transducers are often made using piezoelectric materials.
Implementation Method 2
The transducers can convert electrical energy into sound energy and also convert sound energy (e.g., via detected pressure changes) into an electrical signal
Implementation Method 3
Devices such as transducer elements, or simply transducers, have been developed to produce sound or vibrations at a particular frequency that is transmitted into and through the water and also to detect echo returns from the transmitted sound that return to the transducer after reflecting off an object.
Implementation Method 4
Any reflected sound then returns to the transducer to form a return signal that may be interpreted as a surface of an object.
Data Source
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AI summary
A downscan imaging sonar utilizes a linear transducer element to provide improved images of the sea floor and other objects in the water column beneath a vessel. A transducer array may include a plurality of transducer elements and each one of the plurality of transducer elements may include a substantially rectangular shape configured to produce a sonar beam having a beamwidth in a direction parallel to longitudinal length of the transducer elements that is significantly less than a beamwidth of the sonar beam in a direction perpendicular to the longitudinal length of the transducer elements. The plurality of transducer elements may be positioned such that longitudinal lengths of at least two of the plurality of transducer elements are parallel to each other. The plurality of transducer elements may also include at least a first linear transducer element, a second linear transducer element and a third linear transducer element. The first linear transducer element may be positioned within the housing to project sonar pulses from a first side of the housing in a direction substantially perpendicular to a centerline of the housing. The second linear transducer element may be positioned within the housing to lie in a plane with the first linear transducer element and project sonar pulses from a second side of the housing that is substantially opposite of the first side. The third linear transducer element may be positioned within the housing to project sonar pulses in a direction substantially perpendicular to the plane.