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Open AccessArticle

Coherent Focused Lidars for Doppler Sensing of Aerosols and Wind

Malvern Lidar Consultants, Great Malvern, Worcestershire WR14 1YE, UK
Remote Sens. 2018, 10(3), 466; https://doi.org/10.3390/rs10030466
Received: 16 January 2018 / Revised: 19 February 2018 / Accepted: 21 February 2018 / Published: 16 March 2018
(This article belongs to the Special Issue Remote Sensing of Atmospheric Conditions for Wind Energy Applications)
Many coherent lidars are used today with aerosol targets for detailed studies of e.g., local wind speed and turbulence. Fibre-optic lidars operating near 1.5 μm dominate the wind energy market, with hundreds now installed worldwide. Here, we review some of the beam/target physics for these lidars and discuss practical problems. In a monostatic Doppler lidar with matched local oscillator and transmit beams, focusing of the beam gives rise to a spatial sensitivity along the beam direction that depends on the inverse of beam area; for Gaussian beams, this sensitivity follows a Lorentzian function. At short range, the associated probe volume can be extremely small and contain very few scatterers; we describe predictions and simulations for few-scatterer and multi-scatterer sensing. We review the single-particle mode (SPM) and volume mode (VM) modelling of Frehlich et al. and some numerical modelling of lidar detector time series and statistics. Interesting behaviour may be observed from a modern coherent lidar used at short ranges (e.g., in a wind tunnel) and/or with weak aerosol seeding. We also review some problems (and solutions) for Doppler-sign-insensitive lidars. View Full-Text
Keywords: coherent Doppler lidar; wind sensing; single-particle coherent Doppler lidar; wind sensing; single-particle
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MDPI and ACS Style

Hill, C. Coherent Focused Lidars for Doppler Sensing of Aerosols and Wind. Remote Sens. 2018, 10, 466. https://doi.org/10.3390/rs10030466

AMA Style

Hill C. Coherent Focused Lidars for Doppler Sensing of Aerosols and Wind. Remote Sensing. 2018; 10(3):466. https://doi.org/10.3390/rs10030466

Chicago/Turabian Style

Hill, Chris. 2018. "Coherent Focused Lidars for Doppler Sensing of Aerosols and Wind" Remote Sens. 10, no. 3: 466. https://doi.org/10.3390/rs10030466

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