A method and device for generating a synthetic vortex sound field with a supermode number
A technology of generating device and generating method, which is applied in the direction of frequency/direction characteristic device, sensor parts, sensors, etc., can solve the problem of lack of acoustic orbital angular momentum, etc., and achieve the increase of acoustic orbital angular momentum mode number, improve directivity and orientation Angular resolution, effect of increased resolution
Active Publication Date: 2021-10-19
中科星河(潍坊)投资合伙企业(有限合伙)
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[0004] Aiming at the lack of relevant research on improving the mode number of the acoustic orbital angular momentum of the vortex sound field in the prior art, the present invention provides a method and device for generating a synthetic vortex sound field with a super-mode number. Transducer unit, by adjusting the position and phase of each transducer in the array, an infinite number of modes can be generated
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[0056] Embodiment: the vortex sound field of the synthetic orbital angular momentum mode number of the super mode number of the present invention
[0057] In this embodiment, each parameter is defined as follows:
[0058] The number of original transducer units is N;
[0059] The number of transducer units in the synthetic transducer array is N s ; N s =(s+1)×N;
[0060] The number of synthesized patterns is α′, α′ is an integer, and satisfies:
[0061] Originally N original transducer units, the number of vortex field modes that can be formed is α, α is an integer, and satisfies:
[0062] If the number of synthesis modes is α′, the modulation phase difference between two adjacent transducer units in the synthesis transducer array is:
[0063] The number of times the transducer array rotates is denoted as s;
[0064] The synthesized transducer array refers to an array formed by the position of each transducer unit used for synthesizing the vortex sound field to gen...
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The invention belongs to the technical field of acoustic wave imaging, and in particular relates to a method and device for generating a synthetic vortex sound field of a supermode number. The inventive method comprises the following steps: (1) constructing a transducer array composed of N transducer units, each transducer unit emits a sound field to generate an initial sound field; (2) simultaneously changes the position of the transducer unit and Each transducer unit transmits the phase of the sound field, and every time it changes a sound field, it changes s times to generate s sound fields, wherein the way to change the position of the transducer unit is to rotate the transducer array as a whole; (3) the initial The sound field is superimposed with the s sound fields generated in step (2) to obtain a synthetic vortex sound field with a supermode number; wherein N and s are integers greater than 0, and N*s is not less than 4. The method and device for generating a vortex sound field of the present application are used for underwater communication or acoustic imaging, and can also achieve the effect of increasing the channel capacity and / or improving the resolution thereof, and has a good application prospect.
Description
technical field [0001] The invention belongs to the technical field of acoustic wave imaging and underwater communication, and in particular relates to a method and device for generating a synthetic vortex sound field with a supermode number. Background technique [0002] At present, the research on the vortex sound field is still mainly in the theoretical exploration stage and the preliminary laboratory experiment stage. Because there is no polarization or spin effect in the acoustic wave, the vortex acoustic field does not have spin angular momentum, and can only carry orbital angular momentum. As a new degree of freedom for acoustic wave manipulation, acoustic orbital angular momentum has important scientific significance and application value. Theoretically speaking, the multiplexing technology of acoustic orbital angular momentum can improve the channel capacity of underwater acoustic signal transmission and ensure extremely high transmission accuracy for underwater hi...
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IPC IPC(8): H04R1/40H04R3/00H04B13/02
CPCH04R1/403H04R3/00H04B13/02H04R3/12H04R2201/401H04R1/44G01S15/006G01S15/8922G01S15/894G01S15/8997
Inventor 蒋海波何欣洋宫玉彬唐聃杨阳陈子君付江南高源
Owner 中科星河(潍坊)投资合伙企业(有限合伙)