The quantitative relationship between the target surface speckle phase echo parameters and heterodyne efficiency

Liu, Yutao; Zeng, Xiaodong; Cao, Changqing; Feng, Zhouming; Lai, Zhi; Fan, Zhaojin; Wang, Ting; Cui, Shanbo; Ding, Jialin

doi:10.1016/j.optcom.2019.02.031

Cited by 12 publications

(3 citation statements)

References 25 publications

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“…When a coherent laser beam is incident on an optically rough surface, the wave-front of the laser beam modulated by the surface will produce speckle and reduce the system sensitivity. In a heterodyne system, the intermediate frequency (IF) signals generated by different parts of the photodetector cancel each other out due to the random phase distribution of the speckle field, possibly resulting to decoherence effects [8].…”

Section: Monte Carlo Model For Speckle Fields Interacting With Heteromentioning

confidence: 99%

“…In general, the SNR of a heterodyne system reaches its maximum when both the amplitude and the phase distribution of the signal and the local oscillator fields are perfectly matched. Many applications relying on active detection encounter optically rough surfaces that produce speckle effects, which, consequently, degrade the system sensitivity or result in decoherent effects [1]- [8]. Hence, overcoming the speckle effect in coherent optical detection has become an important issue.…”

Section: Introductionmentioning

confidence: 99%

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Modeling the Heterodyne Efficiency of Array Detector Systems in the Presence of Target Speckle

et al. 2019

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To solve the speckle effect problem in heterodyne detection, an array detector is proposed; heterodyne efficiency is modeled by accounting for speckle and using an additional parameter to simulate coherent summation processing. Heterodyne efficiency is derived by mixing a Monte Carlo simulated speckle field with a planar local oscillator field on a photodetector surface to evaluate the array detector performance at improving signalto-noise ratio (SNR) of the coherent optical system. From the simulation results, the array detector is shown to effectively improve the SNR of the heterodyne system. For low SNR, the heterodyne efficiency of an N × N array detector increases linearly with N.

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Section: Monte Carlo Model For Speckle Fields Interacting With Heteromentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling the Heterodyne Efficiency of Array Detector Systems in the Presence of Target Speckle

et al. 2019

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“…The current solution for this situation is to beam expand the target echo, use multiple detectors to simultaneously heterodyne detect the target echo in each part of the expanded beam, and compensate the intermediate frequency photocurrent generated by each detector 2 of 11 through a post-processing algorithm [10,[20][21][22][23][24][25]. Its core is to design the corresponding algorithm to compensate for the phase noise according to the wavefront distribution characteristics of the target echo.…”

Section: Introductionmentioning

confidence: 99%

Laser Heterodyne Detection Based on Photon Time–Domain Differential Detection Avoiding the Effect of Decoherence Phase Noise

Guan,

Zhang,

Jia

et al. 2023

Sensors

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Laser heterodyne detection (LHD) is a key velocimetry technique that provides better accuracy and sensitivity than direct laser detection. However, random phase noise can be introduced by the surface topography of the moving target undulation or atmospheric turbulence during transmission. The random phase noise causes the target echo to undergo decoherence, resulting in degradation of the signal-to-noise ratio (SNR). Here, we propose a novel LHD method based on photon time–domain differential detection. It can infer the heterodyne spectrum of the target echo and the local oscillator light from the time intervals of the photon arrival. The time interval statistic is a relative quantity, which can effectively avoid the effect of random phase noise in LHD. With our method, the SNR of LHD can be improved in application scenarios where the target echo is decoherent. We developed a complete solution model for acquiring the heterodyne spectrum based on photon time–domain differential detection and performed proof-of-principle experiments. The experimental results show that in the presence of random phase noise, the SNR and velocity measurement error of our method are significantly better than that of the conventional method, and the larger the phase noise is, the more the SNR and velocity measurement error of our method are improved. Moreover, along with the increase in phase noise, the SNR of our method is basically unchanged, which also indicates that our method is not affected by random phase noise. This advantage is significant for photon-level weak echoes that require long detection times to be detected.

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Analysis of coherent laser echo characteristics back scattered from rough Gaussian target

Dong

2022

Optik

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The quantitative relationship between the target surface speckle phase echo parameters and heterodyne efficiency

Cited by 12 publications

References 25 publications

Modeling the Heterodyne Efficiency of Array Detector Systems in the Presence of Target Speckle

Modeling the Heterodyne Efficiency of Array Detector Systems in the Presence of Target Speckle

Laser Heterodyne Detection Based on Photon Time–Domain Differential Detection Avoiding the Effect of Decoherence Phase Noise

Analysis of coherent laser echo characteristics back scattered from rough Gaussian target

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