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Lens structure body of acoustical super lens, acoustical super lens and imaging device thereof

A kind of structure and super lens technology, applied in the direction of lens, material analysis using sound wave/ultrasonic wave/infrasonic wave, measuring device, etc., can solve the problems affecting feasibility, etc., and achieve low energy loss, strong designability, and easy preparation Effect

Inactive Publication Date: 2014-07-09
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This requirement undoubtedly seriously affects the feasibility in practical applications, such as the inspection of subcutaneous tissue structure in medical diagnosis, and the detection of internal defects in materials in industrial non-destructive testing, etc., which cannot meet this requirement

Method used

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  • Lens structure body of acoustical super lens, acoustical super lens and imaging device thereof
  • Lens structure body of acoustical super lens, acoustical super lens and imaging device thereof
  • Lens structure body of acoustical super lens, acoustical super lens and imaging device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] combine figure 1 , a mirror structure of an acoustic hyperlens, the mirror structure is a cuboid structure made of hard material, the material of the mirror structure can be copper or steel, etc., the two square faces of the cuboid They are respectively the lens front and the lens bottom; between the lens front and the lens bottom is provided with a through hole of cuboid structure, and the through holes are arranged in a horizontal and vertical square grid; on the plane where the lens front is located, because The side length a of the through hole and the solid wall thickness a between adjacent through holes 1 The sum Λ determines the resolution of the acoustic metalens, and the smaller Λ means the higher the theoretical resolution can be. Generally, it takes one tenth of the excitation sound wave, and the frequency of the excitation sound wave is generally kilohertz level, so the pass The side length a of the hole and the solid wall thickness a between adjacent throu...

Embodiment 2

[0027] combine figure 1 , an acoustic metalens comprising a light medium and the mirror structure described in Example 1; the light medium is filled in the through hole of the mirror structure; the density ρ of the light medium A less than the mirror structure density ρ B 1 / 5 of that; the light medium can be gas, such as air, nitrogen, oxygen, etc., or water;

[0028] The expressions of the equivalent acoustic density ρ and bulk modulus κ of the acoustic metalens are:

[0029] ρ = ρ 0 0 0 ρ y , 1 ρ x = ...

Embodiment 3

[0047] combine figure 1 , figure 2 , an acoustic metalens imaging device, comprising a signal generator, a power amplifier, a transmitting transducer, a receiving transducer array, the acoustic metalens described in embodiment 2; the signal generator is connected with the power amplifier through a transmission line, The power amplifier is connected to the transmitting transducer through a transmission line; the signal generator generates an electrical signal, the power amplifier amplifies the power of the electrical signal, and the transmitting transducer converts the electrical signal into a frequency equal to that of the electrical signal The acoustic signal of the receiving transducer array is used to receive the acoustic signal and convert the acoustic signal into an electrical signal; the front of the mirror structure is the lens receiving surface of the acoustic hyperlens, and the acoustic hyperlens The receiving surface of the lens is facing the signal transmission di...

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Abstract

The invention provides a lens structure body of an acoustical super lens, the acoustical super lens and an imaging device thereof. The acoustical super lens comprises the lens structure body and light media, the imaging device of the acoustical super lens comprises a signal generator, a power amplifier, a transmitting transducer, the acoustical super lens and a receiving transducer array, the signal generator is connected with the power amplifier through a transmission line, the power amplifier is connected with the transmitting transducer through a transmission line, the front face of the lens structure body is a lens receiving face of the acoustical super lens, the lens receiving face of the acoustical super lens right faces the signal emission direction of the transmitting transducer, the receiving transducer array comprises a plurality of receiving transducers, and the receiving transducers are arranged at the geometric center of a square through hole of the acoustical super lens. According to the lens structure body of the acoustical super lens, the acoustical super lens and the imaging device thereof, high-resolution acoustical imaging can be conducted on an object at a certain distance, and evanescent waves can be well received, amplified and used for improving imaging quality.

Description

technical field [0001] The invention relates to the field of acoustic imaging, in particular to a mirror structure of an acoustic hyperlens, an acoustic hyperlens and an imaging device thereof. Background technique [0002] Acoustic imaging is a fundamental method for probing the structure and composition of matter. Due to the limitation of diffraction limit, the imaging resolution of traditional acoustic imaging equipment can only reach half of the detection wavelength. Those waves whose transverse wave vector is larger than the wave vector k of the background medium are called evanescent waves, and they carry the detailed information of the object. In all natural media, once the evanescent wave leaves the object, it decays exponentially and cannot be received by traditional imaging equipment, thus limiting the imaging resolution. [0003] In recent years, acoustic metamaterials have attracted extensive attention due to their novel acoustic effects and potential applicati...

Claims

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Application Information

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IPC IPC(8): G02B3/12G01N29/22G01N29/00
Inventor 程营刘晓峻周晨魏琦吴大建
Owner NANJING UNIV
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