Optical beam distortions induced by a shock wave

Banakh, V. A.; Sukharev, A. A.; Фалиц, А. В.

doi:10.1364/ao.54.002023

Cited by 21 publications

(5 citation statements)

References 21 publications

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“…Summing the complex Gaussian functions, the function of a circular aperture could be obtained as [55]   where a is the radius of a circle aperture, At and Bt are the expansion and Gaussian coefficients, respectively, from the [60,61]. At this time, the coefficient Cm in (16)…”

Section: Comparison On Optimization Of Detection Probability Using Circular Aperture Methods and Focusing Mirror Methodsmentioning

confidence: 99%

“…In the early research, many researchers used ray tracing and geometric optics methods, mainly focusing on physical quantities such as optical path differences (OPD) [11][12][13] and Strehl ratios (SR) [14,15]. Some researchers also regard the shock layer as a strongly turbulent medium and use the refractive index power spectrum of atmospheric turbulence to layer the sheath to study the propagation and distortion characteristics of optical beam and the influence on imaging quality [16,17]. The turbulence intensity can reach 10 -12 .…”

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confidence: 99%

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Spiral Spectrum of a Laguerre-Gaussian Beam Propagating in Anisotropic Turbulent Plasma

et al. 2021

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The explicit expression of orbital angular momentum (OAM) spiral spectrum of Laguerre-Gaussian (LG) beam propagating in anisotropic plasma turbulence is derived based on Rytov theory. The relationship between the detection probability of OAM and the crosstalk with the anisotropy parameters, topological charge, radial index, wavelength, beam width, receiving aperture, inner and outer scales are discussed in detail. In order to quantify the effect of plasma turbulence, we compared it with atmospheric turbulence based on restriction function. To optimize OAM detection probability, we also compared the effects of circular aperture method(CAM) with focusing mirror method(FMM) on the propagation characteristics of the spiral spectrum. The results show that even in the strong turbulence region of atmospheric turbulence, the radial dimension of LG beam in plasma turbulence is nearly twice that of atmospheric turbulence and the modes crosstalk has almost reached its upper bound. Besides, by comparing the two optimization methods, we found the ability to reduce crosstalk is related to the choice of beam width and receiving aperture. Therefore, we give a method to optimally select between the CAM and the FMM. We found the corresponding relationship and gave an analytical formula. The FMM has a greater ability to reduce crosstalk than the CAM when the beam width≥4cm and the aperture≥3cm. We quantified the effect of plasma turbulence and provide a guideline for the selection of beam width and receiving aperture under these two optimization methods. The research results may be helpful in the field of optical communication.

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Section: Comparison On Optimization Of Detection Probability Using Circular Aperture Methods and Focusing Mirror Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Spiral Spectrum of a Laguerre-Gaussian Beam Propagating in Anisotropic Turbulent Plasma

et al. 2021

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“…From a mathematical point of view, the essence of the ray tracing problem in aerooptics is to solve the ray differential equation of the gas medium in the flowing state [25]:…”

Section: Equivalent Response Model Of Missile-fuze Systemmentioning

confidence: 99%

“…Luo et al [24] proposed a cumulative pulse detection technique. Banakh [25] simplified the fine structure of a flow field by decomposing the flow field into a time-averaged flow field and a pulsating flow field and concluded that a shock wave will cause the beam to focus through numerical simulation. However, research based on numerical methods can only obtain the numerical solution under a single condition, which is not universal when evaluating the detection accuracy of optical detection systems.…”

Section: Introductionmentioning

confidence: 99%

Simulation Test of The Aerodynamic Environment of A Missile-Borne Pulsed Laser Forward Detection System at High Flight Speed

Liu,

Li,

Hua

et al. 2023

Photonics

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When a missile-borne pulsed laser forward detection system flies at supersonic speed, the laser beam will be distorted by the uneven outflow field, resulting in a significant reduction in ranging accuracy. In this paper, the impact of high flight speed on a pulsed laser detection system is studied. First, a new ray tracing method with adaptive step size adjustment is proposed, which greatly improves the computational efficiency. Second, the aerodynamic environment of a munition flying at high speed is simulated by an intermittent transonic and supersonic wind tunnel to obtain the schlieren data of the flow field at various Mach numbers. The schlieren data present a shock wave structure similar to that of the simulation. In addition, the variation patterns of the pulsed laser echo waveform of the model under different aerodynamic conditions are studied to evaluate the detectability and operational stability of the laser detection system under static conditions. The test results match the simulation results well, and the two offer relatively consistent shock wave structures, which verifies the correctness and effectiveness of the flow field simulation model. The test echo waveforms are in good agreement with the simulated echo waveforms; the relative errors between the peak values of test and simulated echo waveforms at various Mach numbers do not exceed 20%, and the correlation coefficients between the test and simulated echo waveforms all exceed 0.7, indicating high correlations between the two.

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“…In 2010, Ding-Hua et al [11] proposed a ray tracing algorithm with variable step size, which could adjust the step size according to the refractive index of the grid and the size of the grid where the ray is located, it could achieve high tracking accuracy and the angular deviation error of tracing could reach about 1%. In 2015, Banakh et al [12] studied the aero-optical effect caused by the beam passing through the shock layer of the hypersonic vehicle cone. It was found that the flight altitude of the vehicle would weaken the deflection effect of the flow field on the beam.…”

Section: Introductionmentioning

confidence: 99%

Research on the influence of aero-optical effects on starlight atmospheric refraction navigation under supersonic conditions

Yang

Song

2022

Front. Appl. Math. Stat.

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In the starlight atmospheric refraction navigation when the starlight transmits in the supersonic flow field, the aero-optical effect will reduce the accuracy of navigation. In this paper, the aircraft model is established by ICEM and Fluent is used to simulate the atmosphere density distribution at different altitudes and speeds. Then, the principle of geometric optics is used to track the starlight, the angular deviation of starlight transmission is deduced, and finally, the influence of different speeds and altitudes on starlight atmospheric refraction navigation is analyzed. The results show that the aero-optical effect produced by supersonic vehicles is related to the flight altitude and flight speed. Taking the flight altitude of 20 and 30 km as an example, when the flight speed is Mach 2, the angular deviation caused by the aero-optical effect is 1.045 and 0.699“ respectively, and when the flight speed is Mach 10, the angular deviation is 20.075 and 4.643”, respectively. Therefore, the aero-optical effect can be ignored at the altitude of 30 km and above. However, the influence of the aero-optical effect at 20 km needs to be judged according to the flight speed.

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Optical beam distortions induced by a shock wave

Cited by 21 publications

References 21 publications

Spiral Spectrum of a Laguerre-Gaussian Beam Propagating in Anisotropic Turbulent Plasma

Spiral Spectrum of a Laguerre-Gaussian Beam Propagating in Anisotropic Turbulent Plasma

Simulation Test of The Aerodynamic Environment of A Missile-Borne Pulsed Laser Forward Detection System at High Flight Speed

Research on the influence of aero-optical effects on starlight atmospheric refraction navigation under supersonic conditions

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