Dual-polarization coherent Doppler lidar with all-fiber on/off-axis switchable design for simultaneous wind and aerosol measurements

作者：Guangyao Dai, Bing Li, Yimai Jing, Xitao Wang, Shengguang Qin, Peishuai Zhang, Yongsheng Ma, Zhenlin Yang, Huina Zhao, Qingyuan Chen, Zhichao Bu, Xuan Wang, Songhua Wu · 发表于：Optics Express · 年份：2025 · DOI：10.1364/oe.579997 · 被引用次数：1 · 研究领域：Atmospheric aerosols and clouds、Meteorological Phenomena and Simulations、Precipitation Measurement and Analysis

This paper presents an all-fiber on/off-axis switchable dual-polarization coherent Doppler lidar (DPCDL) and evaluates its performance in wind and aerosol observations. This lidar integrates the coherent Doppler and micro-pulse polarization detection techniques, and achieves the capabilities of simultaneously profiling the atmospheric wind field and depolarization ratio at the wavelength of 1550 nm. The well-developed single-depolarization coherent Doppler lidar (CDL) system typically only collects the parallel component of backscatter signals, disregarding the orthogonal component perpendicular to the polarization direction of the emitted beam, which limits its capability in measurement range and aerosol observation accuracy. The DPCDL adopts an on/off-axis switchable mode, synchronously detecting the dual-polarization component information of backscatter signals through dual coherent channels. It not only improves the signal utilization and wind speed detection performance, but also enables the high-precision real-time retrieval of the aerosol depolarization ratio. To validate the reliability of atmospheric wind speed measurements, the experiment employed a technically mature and commercially available coherent Doppler Lidar (CDL) system for side-by-side comparison observations with the newly-built DPCDL. The correlation coefficient between the wind speed measurements from these two lidars reached up to 0.982, with a wind speed deviation of less than 0.077 m/s. Additionally...