Analytical and numerical approaches to study echo laser pulse profile affected by target and atmospheric turbulence

Hao, Qun; Cheng, Yang; Cao, Jie; Zhang, Fanghua; Zhang, Xinmu; Yu, Haoyong

doi:10.1364/oe.24.025026

Cited by 27 publications

(7 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They can be obtained by where η trans , η atm , η DOE , w L , and θ are the transmitting system efficiency, one-way atmospheric transmission, over efficiency of the DOE, beam radius at the target plane, and full diffusion angle of the DOE, respectively. 〈 W turb 〉 is the increased beam radius caused by atmospheric turbulence, which can be expressed as 44 where 〈 〉 denotes the ensemble average, l 0 is the inner-scale size of turbulence, and C n 2 is the index of refraction structure constant. The scale of C n 2 represents the intensity of the atmospheric turbulence.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Design and modeling of pulsed-laser three-dimensional imaging system inspired by compound and human hybrid eye

Cheng

Cao

Zhang

et al. 2018

Sci Rep

Self Cite

View full text Add to dashboard Cite

A pulsed-laser three-dimensional imaging system inspired by compound and human hybrid eye is proposed. A diffractive optical element is used to enlarge field of view (FOV) of transmitting system and a receiving system consisting of a non-uniform microlens array, an aperture array, and an avalanche photodiode array is designed. The non-uniform microlens array is arranged on a curved surface to mimic large FOV feature of the compound eye. Meanwhile, the non-uniform microlens array is modeled to mimic space-variant resolution property of the human eye. On the basis of the proposed system, some simulation experiments are carried out. Results show that the entire FOV is up to 52°, and the resolution is 30 × 18. The proposed system has a high resolution in the center FOV and a low resolution in the peripheral FOV. The rotation and scaling invariances of the human eye are verified on the proposed system. The signal-to-noise ratio (SNR) increases with the increase in the number of rings and the maximum SNR locates at the outmost periphery area. This work is beneficial to the design of the pulsed laser three-dimensional imaging system with large FOV, high speed, and high resolution.

show abstract

Section: Methodsmentioning

confidence: 99%

“…( 11 ), we can obtain the pulsed echo profile for the n -th ring APD detector as In Eq. ( 12 ), λ t is the pulse width after broadening by the atmospheric turbulence, which is expressed as 44 where L 0 is the outer-scale size of turbulence.…”

Section: Methodsmentioning

confidence: 99%

Design and modeling of pulsed-laser three-dimensional imaging system inspired by compound and human hybrid eye

Cheng

Cao

Zhang

et al. 2018

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…The power of the transmitted laser pulse is supposed to be a temporal function of Gaussian model and it can be written as [31] …”

Section: Analysis Of the Differential Bfwsmentioning

confidence: 99%

A Novel De-Noising Method for Improving the Performance of Full-Waveform LiDAR Using Differential Optical Path

et al. 2017

Self Cite

View full text Add to dashboard Cite

A novel de-noising method for improving the performance of full-waveform light detection and ranging (LiDAR) based on differential optical path is proposed, and the mathematical models of this method are developed and verified. Backscattered full-waveform signal (BFWS) is detected by two avalanche photodiodes placed before and after the focus of the focusing lens. On the basis of the proposed method, some simulations are carried out and conclusions are achieved.(1) Background noise can be suppressed effectively and peak points of the BFWS are transformed into negative-going zero-crossing points as stop timing moments. (2) The relative increment percentage of the signal-to-noise ratio based on the proposed method first dramatically increases with the increase of the distance, and then the improvement gets smaller by increasing the distance. (3) The differential Gaussian fitting with the Levenberg-Marquardt algorithm is applied, and the results show that it can decompose the BFWS with high accuracy. (4) The differential distance should not be larger than c/2 × τ rmin , and two variable gain amplifiers can eliminate the inconsistency of two differential beams. The results are beneficial for designing a better performance full-waveform LiDAR.

show abstract

“…Blanquer et al [17] performed a detailed study on the echo equation of airborne pulsed lidar and analyzed the influence of different factors on the ranging accuracy of LiDAR. Hao et al [18] studied a comprehensive model of the echo laser pulse profile (ELPP) of an arbitrarily shaped target under the simultaneous actions of the target and atmospheric turbulence.…”

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

View full text Add to dashboard Cite

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.

show abstract

Analytical and numerical approaches to study echo laser pulse profile affected by target and atmospheric turbulence

Cited by 27 publications

References 37 publications

Design and modeling of pulsed-laser three-dimensional imaging system inspired by compound and human hybrid eye

Design and modeling of pulsed-laser three-dimensional imaging system inspired by compound and human hybrid eye

A Novel De-Noising Method for Improving the Performance of Full-Waveform LiDAR Using Differential Optical Path

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

Contact Info

Product

Resources

About