CW Direct Detection Lidar with a Large Dynamic Range of Wind Speed Sensing in a Remote and Spatially Confined Volume

A novel continuous-wave (CW) direct detection lidar (DDL) is demonstrated to be capable of wind speed measurement 40 m away with an update rate 4 Hz using a fiber-based scanning Fabry–Perot interferometer as optical frequency discriminator. The proposed CW DDL has large dynamic range no sign ambiguity and its sensitivity assessed by comparing performance that coherent (CDL) in side-by-side measurement. theoretical model the spatial weighting function also presented validated experimentally. This work shows spatially confined volume Lorentzian axial profile similar CDL. potential use various applications which requirements such high-speed sensing directional discrimination are not met state-of-the-art Doppler systems.