Progress towards an Autonomous Field Deployable Diode-Laser-Based Differential Absorption Lidar (DIAL) for Profiling Water Vapor in the Lower Troposphere
Progress towards an Autonomous Field Deployable Diode-Laser-Based Differential Absorption Lidar (DIAL) for Profiling Water Vapor in the Lower Troposphere
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DOI：
10.3390/rs5126241
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发表时间：
2013-11
期刊：
影响因子：
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通讯作者：
K. Repasky;D. Moen;S. Spuler;A. Nehrir;J. Carlsten
中科院分区：
文献类型：
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作者：
K. Repasky;D. Moen;S. Spuler;A. Nehrir;J. Carlsten
已研制出一台激光发射机，并将其纳入微脉冲差分吸收激光雷达，用于对流层低层水汽剖面测量，这是迈向长期自主实地作业的重要一步。激光发射器利用两个分布式布拉格反射器（DBR）二极管激光器来注入种子脉冲锥形半导体光放大器（TSOA），并且能够产生高达10 mJ的脉冲能量，具有1 ms的脉冲持续时间和10 kHz的脉冲重复频率。激光发射器的在线波长可以根据主要的大气条件沿着以828.187 nm为中心的水蒸气吸收特征（在真空中）在任何地方操作，而离线波长在828.287 nm处操作。这种激光发射器已被纳入DIAL仪器利用35.6厘米施密特-卡塞格伦望远镜和光纤耦合雪崩光电二极管（APD）在光子计数模式下工作。DIAL仪器的性能在10天的观察期内得到证明。在此观测期间，从无线电探空仪的数据被用来检索水蒸气数密度廓线与从DIAL数据检索的数密度廓线进行比较。
A laser transmitter has been developed and incorporated into a micro-pulse differential absorption lidar (DIAL) for water vapor profiling in the lower troposphere as an important step towards long-term autonomous field operation. The laser transmitter utilizes two distributed Bragg reflector (DBR) diode lasers to injection seed a pulsed tapered semiconductor optical amplifier (TSOA), and is capable of producing up to 10 mJ of pulse energy with a 1 ms pulse duration and a 10 kHz pulse repetition frequency. The on-line wavelength of the laser transmitter can operate anywhere along the water vapor absorption feature centered at 828.187 nm (in vacuum) depending on the prevailing atmospheric conditions, while the off-line wavelength operates at 828.287 nm. This laser transmitter has been incorporated into a DIAL instrument utilizing a 35.6 cm Schmidt-Cassegrain telescope and fiber coupled avalanche photodiode (APD) operating in the photon counting mode. The performance of the DIAL instrument was demonstrated over a ten-day observation period. During this observation period, data from radiosondes were used to retrieve water vapor number density profiles for comparisons with the number density profiles retrieved from the DIAL data.