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首页> 外文会议>Remote Sensing of Clouds and the Atmosphere XII; Proceedings of SPIE-The International Society for Optical Engineering; vol.6745 >Evolution study of smoke backscattering coefficients in a cell by means of a compact mobile Nd:YAG lidar system
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Evolution study of smoke backscattering coefficients in a cell by means of a compact mobile Nd:YAG lidar system

机译：紧凑型移动Nd：YAG激光雷达系统对烟气中反向散射系数的演化研究

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摘要

Detection of smoke from forest fire is one of the practical applications of lidar. As it is well known, smoke contains a large number of small particles of ash or soot, leading to a large backscattering efficiency and consequently favourable conditions for lidar application. We have developed a compact mobile lidar system based on Nd:YAG Q-Switched laser source, operating at three wavelengths: 1064 nm, 532 nm and 355 nm, with emission rate of 10 Hz and pulse duration equal to 5 ns when the laser operate at the fundamental harmonic and 4 ns for the second and the third ones. The system has been tested by experimental measurements of the smoke backscattering coefficients carried out in an ad hoc cell. Since the spatial resolution of laser pulse is smaller than the cell length it has been possible to evaluate the profile of the smoke backscattering coefficients inside the cell itself. Moreover it has been developed a computational model for simulating the temporal and spatial evolution of smoke within the cell. These experimental and theoretical data have been used to optimize the theoretical already developed to study the smoke evolution into the atmosphere. In this paper measurements of smoke backscattering coefficients into a cell and simulations of smoke evolution will be presented..
机译：从森林火灾中检测烟雾是激光雷达的实际应用之一。众所周知，烟中含有大量的小颗粒灰或烟灰，从而导致很大的反向散射效率，从而为激光雷达的应用提供了有利条件。我们开发了一种基于Nd：YAG Q开关激光源的紧凑型移动激光雷达系统，该系统在三种波长下工作：1064 nm，532 nm和355 nm，发射速率为10 Hz，激光工作时脉冲持续时间等于5 ns在基本谐波上为4 ns，第二和第三次为4 ns。该系统已通过对在ad hoc电池中进行的烟雾反向散射系数的实验测量进行了测试。由于激光脉冲的空间分辨率小于像元长度，因此有可能评估像元自身内部的烟雾反向散射系数的分布。此外，已经开发了一种用于模拟细胞内烟雾的时间和空间演变的计算模型。这些实验和理论数据已用于优化已经开发的用于研究烟雾向大气中逸散的理论。在本文中，将介绍将烟雾的反向散射系数测量到一个单元中并模拟烟雾释放的过程。

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