The irradiating field of view of imaging laser radar under fog conditions in a controlled laboratory environment

Song, Wenhua; Ghassemlooy, Zabih; Lai, Jiancheng; Yan, Wei; Wang, Chunyong; Li, Zhenhua

doi:10.1088/2040-8986/aa6090

Cited by 11 publications

(2 citation statements)

References 31 publications

(46 reference statements)

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“…However, the target used is a standard Lambertian reflector and therefore the laser spot on the target can be considered as a first order Lambertian source where any points of the laser spot behaves almost like an isotropic source. In the ILR system, the backscattered light received as a reflected pulse due to the fog is also significant as was investigated in our previous work [40].…”

Section: (C) the Link Performance Considering Attenuations And The Inmentioning

confidence: 99%

Influence of fog on the signal to interference plus noise ratio of the imaging laser radar using a 16-element APD array

Song¹,

Lai²,

Ghassemlooy³

et al. 2018

Opt. Express

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This paper investigates the signal to interference plus noise ratio (SINR) performance of the imaging laser radar (ILR) system operating at a wavelength of 905 nm using an avalanche photodiode array under the fog condition. We analysis the glow image of the light source, which is formed by the laser spot irradiated on a standard Lambertian target. Based on the proposed theoretical model, we determine the interference due to the glow inter-channel crosstalk under different fog conditions for a targeted channel. We show that, for transmission spans less than several tens of meters the interference due to glow crosstalk is higher than the fog (light to medium) induced losses. However, for a link range longer than 21 m the glow crosstalk induced interference is lower than the heavy fog induced attenuation. The proposed system performance is evaluated by developing an experimental test bed and using a dedicated indoor atmospheric chamber under homogeneously controlled fog conditions. We show that, under different fog conditions experimental results for changing SINR levels match well with the predicted data. The results shown can be used for design optimization of the ILR system when operated under fog conditions.

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Section: (C) the Link Performance Considering Attenuations And The Inmentioning

confidence: 99%

Influence of fog on the signal to interference plus noise ratio of the imaging laser radar using a 16-element APD array

Song¹,

Lai²,

Ghassemlooy³

et al. 2018

Opt. Express

Self Cite

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show abstract

“…Recently, many groups have studied the transmission effects of the high energy short pulse laser in the atmosphere, [1][2][3][4][5][6][7][8][9][10][11] which is useful for some technical fields, such as directed energy systems, [12] laser lightning rods, [13] atmospheric laser communication, [14] laser radar, [15] etc.…”

Section: Introductionmentioning

confidence: 99%

Transmission effects of high energy nanosecond lasers in laser-induced air plasma under different pressures

Yin

Wang

et al. 2023

Chinese Phys. B

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When a high energy nanosecond (ns) laser induces breakdown in the air, the plasma density generated in the rarefied atmosphere is much smaller than that at normal pressure. It is associated with a relatively lower absorption coefficient and reduces energy loss of the laser beam at low pressure. In this paper, the general transmission characterizations of a joule level 10 ns 1064 nm focused laser beam are investigated both theoretically and experimentally under different pressures. The evolution of the electron density (n e ), the changes in electron temperature (T e ) and the variation of laser intensity (I) are employed for numerical analyses in the simulation model. For experiments, four optical image transfer systems with focal length (f) of 200 mm are placed in a chamber and employed to focus the laser beam and produce plasmas at the focus. The results suggest that the transmittance increases obviously with the decreasing pressure and the plasma channels on the transmission path can be observed by its self-illumination. The simulation results agree well with the experimental data. The numerical model presents that the maximum n e at the focus can reach 1019 /cm3, which is far below the critical density (n c ). As a result, the laser beam is not completely shielded by the plasmas.

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Flexible real-time gigabit free-space optic demonstrator

Haigh,

Abadi,

Ghassemlooy

et al. 2024

Opt Quant Electron

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The irradiating field of view of imaging laser radar under fog conditions in a controlled laboratory environment

Cited by 11 publications

References 31 publications

Influence of fog on the signal to interference plus noise ratio of the imaging laser radar using a 16-element APD array

Influence of fog on the signal to interference plus noise ratio of the imaging laser radar using a 16-element APD array

Transmission effects of high energy nanosecond lasers in laser-induced air plasma under different pressures

Flexible real-time gigabit free-space optic demonstrator

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