Evidence of Decreased Heterodyne-Detection Efficiency Caused by Fast Beam Scanning in Wind Sensing Coherent Doppler Lidar, and Demonstration on Recovery of the Efficiency With Lag-Angle Compensation

Ito, Yusuke; Imaki, Masaharu; Sakimura, Takeshi; Yanagisawa, Takayuki; Kameyama, Shumpei

doi:10.1109/tgrs.2022.3196666

Cited by 6 publications

(2 citation statements)

References 23 publications

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“…© 2024 The Japan Society of Applied Physics system efficiency of 0.25 in the table is an empirically reasonable value for CDLs. 25) The experimental results of coherence time and detectability have been read from the figures in the literature. The calculated coherence time is also shown in the case of a 90°i ncident angle of a particle using Eq.…”

Section: Verification Of Experimentally Reported Single-particle Dete...mentioning

confidence: 99%

Investigation of single-particle detection of continuous-wave coherent Doppler lidar: theoretical feasibility and performance comparison with multiple-particle detection state

Kameyama

2024

Jpn. J. Appl. Phys.

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Single-particle detection with a continuous-waves coherent Doppler lidar (CW-CDL) is an interesting event. Even though some experimental results have been shown in past literatures as evidence of single-particle detection, these results have not been verified from theoretical point of view. Here, performance of a CW-CDL with the single-particle detection is investigated. Examples of single-particle detection which have been reported in the past literatures are verified by using theoretical simulation. Further, comparison on signal detection ability between single- and multiple- particle cases is additionally performed theoretically.

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Section: Verification Of Experimentally Reported Single-particle Dete...mentioning

confidence: 99%

Investigation of single-particle detection of continuous-wave coherent Doppler lidar: theoretical feasibility and performance comparison with multiple-particle detection state

Kameyama

2024

Jpn. J. Appl. Phys.

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“…However, in practice the available range of scan speeds is limited. For faster scan speeds, the lag angle becomes noticeable and prevents a high quality return signal (Ito et al, 2022), as well as a reliable aircraft motion correction (due to the rapidly changing aircraft motion projection).…”

Section: Scanning-beam Setupmentioning

confidence: 99%

Advancing airborne Doppler lidar wind profiling in turbulent boundary layer flow – an LES-based optimization of traditional scanning-beam versus novel fixed-beam measurement systems

Gasch

Kasic²,

Maas³

et al. 2023

Preprint

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Abstract. There is a need for improved wind measurements inside the planetary boundary layer (PBL), including the capability to sample turbulent flow. Airborne Doppler lidar (ADL) provides unique capabilities for spatially resolved and targeted wind measurements in the PBL. However, ADL wind profiling in the PBL is challenging, as turbulence violates the flow homogeneity assumption used in wind profile retrieval and thereby introduces error in the retrieved wind profiles. As turbulence is a dominant source of error it is necessary to investigate and optimize ADL wind profiling capabilities in turbulent PBL flow. This study investigates the potential of a novel multiple fixed-beam ADL system design to provide improved wind information in turbulent PBL flow, compared to traditional single scanning-beam ADL systems. To achieve this, an LES-based airborne Doppler lidar simulator presented in Gasch et al. (2020) is employed and extended in this study. Results show that a multiple fixed-beam system with settings comparable to those of commonly used single scanning-beam systems offers distinct advantages. Advantages include overall reduced wind profile retrieval error due to turbulence and improved spatial representation alongside higher wind profile availability. The study also offers insight into the dependence of the retrieval error on system setup parameters and retrieval parameters for both fixed-beam and scanning-beam systems. When using a fixed-beam system, an order of magnitude higher wind profile resolution appears possible, compared to traditional scanning systems at comparable retrieval accuracy. Thus, using multiple fixed-beam systems opens the door towards better sampling of turbulent PBL flow. Overall, the simulator provides a cost-effective tool to investigate and optimize wind profile error characteristics due to turbulence, and to optimize system setup and retrieval strategies for ADL wind profiling in turbulent flow.

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Real-Time Wind Sensing With Massively Parallel Sample Processing

Xynos,

Zompakis,

Marantos

et al. 2023

IEEE Sens. Lett.

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Evidence of Decreased Heterodyne-Detection Efficiency Caused by Fast Beam Scanning in Wind Sensing Coherent Doppler Lidar, and Demonstration on Recovery of the Efficiency With Lag-Angle Compensation

Cited by 6 publications

References 23 publications

Investigation of single-particle detection of continuous-wave coherent Doppler lidar: theoretical feasibility and performance comparison with multiple-particle detection state

Investigation of single-particle detection of continuous-wave coherent Doppler lidar: theoretical feasibility and performance comparison with multiple-particle detection state

Advancing airborne Doppler lidar wind profiling in turbulent boundary layer flow – an LES-based optimization of traditional scanning-beam versus novel fixed-beam measurement systems

Real-Time Wind Sensing With Massively Parallel Sample Processing

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