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首页> 外文会议>Lidar Remote Sensing for Environmental Monitoring VIII; Proceedings of SPIE-The International Society for Optical Engineering; vol.6681 >Sounding of the environment by means of the un-impulse of the low-power continuous source
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Sounding of the environment by means of the un-impulse of the low-power continuous source

机译：通过低功率连续源的非脉冲声对环境进行探测

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摘要

At the present time laser systems for atmospheric remote sensing assume the use of powerful pulse lasers in most cases and a signal backscattered from a medium is recorded with a certain step digitization corresponding to the required spatial resolution. Moreover a distance extension of sounding requires essentially disproportionate increase in radiation power and use of complex methods to extend a dynamic range of receiving devices; it also causes the multiple scattering effects which can be difficult to take into account. Qualitatively new approach which allows many by-effects to be avoided is proposed. The approach is based on use of a low-power radiation source (for example, white light) with specified gating, when time of source radiation interruption is equal to a pulse duration of an ordinary lidar (about 10~(-8) c), and frequency corresponds to a propagation time of radiation in a zone where the multiple scattering can be neglected. Digitization of the recorded backscattered signal can produce by ordinary digital systems as a discrete readout of signals with the same duration. However to increase a reconstruction accuracy for the medium characteristics we propose to reconstruct the average values of these characteristics over the parts commensurable with the sounding path length. The algorithm proposes creation of recording system with corresponding gating for incoming signal. Estimations 1 have shown that the measurements with accuracy of ～ 1…10 % become possible in the single scattering over the wide range of atmospheric conditions and for safety source power up to 10-20 watt. Moreover, a linear operating mode for photoelectric multiplier can be easily provided and measurements can be carried out in the daytime with the specified accuracy. Such an approach allows us to increase a precision of measurements and can be applied in various areas from the lidar and radar systems to biological and medical devices.
机译：目前，用于大气遥感的激光系统在大多数情况下都假定使用大功率脉冲激光，并且从介质反向散射的信号以与所需空间分辨率相对应的特定步进数字化被记录下来。此外，探测距离的扩展本质上要求辐射功率的增加不成比例，并且需要使用复杂的方法来扩展接收设备的动态范围。它也会引起多重散射效应，而这是很难考虑的。提出了一种定性的新方法，该方法可以避免许多副效应。该方法基于使用具有指定门控的低功率辐射源（例如白光），当源辐射中断的时间等于普通激光雷达的脉冲持续时间（大约10〜（-8）c）时，并且频率对应于在可以忽略多重散射的区域中辐射的传播时间。普通数字系统可以将记录的反向散射信号数字化，作为具有相同持续时间的信号的离散读数。但是，为了提高介质特性的重构精度，我们建议在与探测路径长度相当的部分上重构这些特性的平均值。该算法提出了创建具有输入信号的相应门控的记录系统。估计1表明，在大范围的大气条件下以及对于安全源功率高达10-20瓦的单次散射中，可以进行精度为〜1…10％的测量。此外，可以轻松提供光电倍增器的线性工作模式，并且可以在白天以指定的精度进行测量。这种方法使我们能够提高测量精度，并且可以应用于从激光雷达和雷达系统到生物和医疗设备的各个领域。

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