Scattering of electromagnetic waves by an acoustic disturbance in the atmosphere

Tonning, A.

doi:10.1007/bf02920397

Cited by 10 publications

(11 citation statements)

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“…Denoting the electric susceptibility of air by , we take the latter to be proportional to the number density of particles. Hence (1) so that (2) Using the equation of state for gases, assuming adiabatic changes, and replacing the differentials by finite changes, we find (see [1 p. 404 which relates the modulation of electric permittivity to the relative amplitude of the pressure variation. The intensity of a sound wave at height is given by (4) where is the mass density of air.…”

Section: A Modulation Caused By the Acoustic Beammentioning

confidence: 99%

Electro-acoustic scattering in an atmosphere with wind

Tonning

2003

IEEE Trans. Antennas Propagat.

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An electromagnetic wave propagating in the atmosphere is scattered by a beam of acoustic waves. The paper studies how a wind interferes with the scattering process. The purpose is to use the results for measuring the wind velocity and the temperature of the atmosphere at varying heights. A scattering calculation is carried out by means of standard methods used in problems of wave scattering. The scattering characteristics show a pronounced resonance, due to interference between spherical, i.e, nonplanar, waves. The resonance, and particularly the width of the resonance curve, represents a possibility of measuring the temperature of the atmosphere in the scattering region. The paper points out the advantage of having the acoustic beam generated by an array of phase controlled elementary acoustic sources. This opens the possibility of counteracting the effect of the wind on the acoustic beam so that the beam is keeping its direction undisturbed by the wind. By this method the problem of measuring the horizontal wind components is converted to a measurement of phase.

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Section: A Modulation Caused By the Acoustic Beammentioning

confidence: 99%

Electro-acoustic scattering in an atmosphere with wind

Tonning

2003

IEEE Trans. Antennas Propagat.

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“…It was found that an acoustic wave could induce the change of the atmospheric refractivity in 1950s [see Tonning , ]. As an acoustic wave is a type of elastic longitudinal wave, it can cause the periodic motion of local atmosphere mass elements when it propagates through the troposphere.…”

Section: The Model For Analyzing the Artificial Atmospheric Refractivmentioning

confidence: 99%

“…Now the acoustic wave‐induced fluctuation in N , noted as Δ N C , can be quantifiably evaluated based on equation . Tonning [] shows that the variation of the dielectric property of a dry gas is just related to the change in pressure and Δ e / e = Δ P / P . As a consequence, based on equation the instantaneous Δ N C _ I and the effective Δ N C _ E of Δ N C at a space point are given as equations and .…”

Section: The Model For Analyzing the Artificial Atmospheric Refractivmentioning

confidence: 99%

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A novel idea of purposefully affecting radio wave propagation by coherent acoustic source‐induced atmospheric refractivity fluctuation

2015

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The mechanism generating the array‐distributed atmospheric refractivity fluctuation by a coherent acoustic source is analyzed. The theoretical model is established, which is used to quantifiably analyze the array structure of the artificial dielectric irregularities. It is qualitatively validated that the array‐distributed artificial dielectric irregularities really exist and that the array structure of the artificial dielectric irregularities and the scattering effect of the artificial dielectric irregularities on a radio wave can be controlled by adjusting and selecting the optimized parameters of the transmitted acoustic wave and the adopted acoustic antenna array. It can be concluded that the array‐distributed artificial dielectric irregularities can be used to purposefully affect radio wave propagation. After radio acoustic sounding system, the idea of this paper is a novel development in the field of the tropospheric atmospheric refractivity artificial abnormality technique and its applications.

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“…The idea of changing the tropospheric refractivity by the disturbance of acoustic wave is first proposed in [1], in which A. Tonning pointed out the viewpoint that an acoustic wave propagating in the troposphere can cause the atmospheric refractivity fluctuation and theoretically analyzed the rationality of the viewpoint. In the next 50 years, radio acoustic sounding system (RASS) began to be established to detect atmospheric temperature, wind profile, and turbulence in the lower troposphere [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

A Novel Idea of Coherent Acoustic Wave-Induced Atmospheric Refractivity Fluctuation and Its Applications

Gong¹,

Liu²,

Hou³

et al. 2018

Computational and Experimental Studies of Acoustic Waves

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The physical mechanism of generating the lasting tropospheric refractivity fluctuation with a stable array-distributed structure by coherent acoustic waves is investigated. An example of the quantitative calculation of atmospheric refractive index is given and analyzed. Based on the theory of electromagnetic wave propagation and scattering in the troposphere, the feasibility to purposefully affect radio wave propagation is qualitatively demonstrated by the experiment of the coherent acoustic source-induced laser interference fringe change. The potential application aspects of synthetically controlling the radio wave propagation by the artificial refractivity fluctuation structure are preliminarily proposed. This chapter will promote the development of the coherent acoustic wave-induced tropospheric refractivity fluctuation, and it has the important theoretical significance and potential application value to purposely apply the positive or negative effects on radio wave propagation.

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Scattering of electromagnetic waves by an acoustic disturbance in the atmosphere

Cited by 10 publications

References 1 publication

Electro-acoustic scattering in an atmosphere with wind

Electro-acoustic scattering in an atmosphere with wind

A novel idea of purposefully affecting radio wave propagation by coherent acoustic source‐induced atmospheric refractivity fluctuation

A Novel Idea of Coherent Acoustic Wave-Induced Atmospheric Refractivity Fluctuation and Its Applications

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