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首页> 外文会议>Conference on Laser Weapons technology 24-25 April 2000 Orlando, USA >Active Suppression of Acoustically Induced Jitter for the Airborne Laser
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Active Suppression of Acoustically Induced Jitter for the Airborne Laser

机译：主动抑制机载激光的声诱发抖动

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摘要

The Airborne Laser (ABL) system has extremely tight jitter requiremnets. Acoustic distribances, such as those caused by the pressure recovery system of the high power laser, are a significant jitter source. Several technologies may be appropriate for reducing the acoustically induced jitter. The first choice for mitigation will be passive approaches, such as acoustic blankets. There is, howeve,r some uncertainty whether these approaches will provide sufficient attenuation and there is concern about the weight of these appr0oaches. A testbed that captured the fundamental physics of the ABL acoustically induced optical jitter problem was deeveloped. this testbed consists of a flexure-mounted mirror exposed to an acoustic field that is generated outside a beam tube and then propagates within the tube. Both feedback and adaptive feedforward cofntrol topologies were implemented on the testbed using either of two actuators (a fast steering mirror and a secondary acoustic speaker located near the precision mirror), and a variety of ensors (microphones measuring the acoustic disturbance, accelerometers and microphones mounted on the precision optic, and an optical position sensing detector). This paper summarizes the results from these contorl topologies for reducing the acoustically induced jitter with some control topologies achieving in excess of 40 dB jitter reduction at a single frequency. This work was performed under an SBIR Phase I funded by the Air Force Research Laboratory Space Vehicles Directorate (AFRL/VS).
机译：机载激光（ABL）系统具有极为严格的抖动要求。诸如高功率激光器的压力恢复系统所引起的声学偏差是重要的抖动源。几种技术可能适用于减少声诱发的抖动。缓解的首选将是被动方法，例如隔音毯。然而，这些方法是否会提供足够的衰减还存在一些不确定性，而且这些方法的权重令人担忧。开发了捕获ABL声学引起的光抖动问题的基本物理原理的测试平台。该测试台由安装在挠曲镜上的反射镜暴露于在声束管外部产生的声场，然后在声束管内传播。使用两个执行器（快速转向镜和位于精密镜附近的辅助声学扬声器）中的任一个，以及各种传感器（测量声音干扰的麦克风，加速度计和麦克风），在测试台上实现了反馈和自适应前馈cofntrol拓扑结构以及光学位置感应检测器）。本文总结了这些控制拓扑的结果，这些噪声可通过一些控制拓扑在单个频率上减少超过40 dB的抖动来降低声诱发的抖动。这项工作是在空军研究实验室太空飞行器管理局（AFRL / VS）资助的SBIR第一阶段完成的。

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