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A Device Realizing the Inverse Doppler Effect

A Doppler effect and device technology, applied in the field of electromagnetic wave devices, can solve problems such as limited frequency band, complex structure, difficult experimental detection, etc., and achieve a wide range of applications.

Inactive Publication Date: 2019-02-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of complex structure, difficult experimental detection, and limited frequency band in the prior art, the present invention proposes a device for realizing the inverse Doppler effect

Method used

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  • A Device Realizing the Inverse Doppler Effect

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Embodiment 1

[0028] Such as figure 1 As shown, the whole device is composed of a cylindrical inner sleeve (1) with a radius a and a cylindrical outer sleeve (2) with a radius b. The area between the inner sleeve (1) and the outer sleeve (2) is filled with an anisotropic inhomogeneous electromagnetic medium related to the geometric size of the device, and its relative permittivity and permeability are both second-order tensors . In the cylindrical coordinate system, it can be described by a matrix

[0029] ε=[ε rr ,ε rθ ,ε rz ;ε θr ,ε θθ ,ε θz ;ε zr ,ε zθ ,ε zz ],μ=[μ rr ,μ rθ ,μ rz μ θr ,μ θθ ,μ θz μ zr ,μ zθ ,μ zz ]. To implement our device, these parameter components are specifically required as follows:

[0030] ε rr =μ rr =ε zz =μ zz = 1,

[0031] ε rθ =μ rθ =ε θr =μ θr =rπ / (a-b),

[0032] ε θθ =μ θθ =1+r 2 π 2 / (b-a) 2 ,

[0033] ε rz =μ rz =ε zr =μ zr =ε θz =μ θz =ε zθ =μ zθ =0.

[0034] Wherein, a is the radius of the inner sleeve (1), b...

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Abstract

The present invention discloses a novel device for realizing an inverse Doppler effect. The device of the invention comprises an inner sleeve and an outer sleeve; the cross sections of the inner sleeve and the outer sleeve are circular, and the radiuses of the inner sleeve and the outer sleeve are a and b respectively; a moving wave source is arranged in the inner space of the inner sleeve; an annular region between the inner sleeve and the outer sleeve is filled with a non-uniform anisotropic medium; the outer environment of the outer sleeve and the internal space environment of the inner sleeve are both air, so that the outer sleeve and the inner sleeve can be both used in a normal environment, and therefore, the novel device has a wide application range; the moving wave source is located in the air region of the internal space of the inner sleeve, an observer or a detector is located in the outer air region of the outer sleeve; and the relative dielectric constant and relative permeability of the anisotropic medium which fills the annular region between the inner sleeve and the outer sleeve are both second-order tensors. The realization of the novel device does not require a negative-refractive index material, and the wave source or the detector is not required to be arranged in the negative-refractive index material. According the novel device of the invention, the wave source and the observer can be both located in the air to achieve the inverse Doppler effect.

Description

technical field [0001] The invention belongs to electromagnetic wave devices, relates to a technology capable of realizing the inverse Doppler effect in free space, and provides a device for realizing the inverse Doppler effect. Background technique [0002] The Doppler effect describes the frequency change that the observer receives when there is relative motion between the wave source and the observer. When the wave source moves close to the observer, the frequency received by the observer is higher than the frequency radiated by the wave source when there is no relative motion between the two (frequency blue shift); and when the wave source moves away from the observer, the frequency received by the observer The frequency is lower (frequency redshifted) than that emitted by the wave source when there is no relative motion between the two. Doppler effect exists in any form of fluctuations such as light waves, sound waves, etc. The Doppler effect has many applications in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B15/00G01B9/02
CPCG01B9/02002G01B15/00
Inventor 孙非何赛灵
Owner ZHEJIANG UNIV
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