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Expanding range of pulsed range sensors with active projection from spatial light modulators

机译：通过空间光调制器的主动投影来扩展脉冲范围传感器的范围

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LIDAR-based systems measure the time-of-flight of a laser source onto the scene and back to the sensor, building a wide field of view 3D raster image, but as a scanning process, there are problems associated with motion inside the scene over the duration of the scan. By illuminating the entire scene simultaneously using a broad laser pulse, a 2D camera equipped with a high speed shutter can measure the time-of-flight over the entire field of view (FOV), thereby, recording an instantaneous snap-shot of the entire scene. However, spreading the laser reduces the range. So what is required is a programmable system that can track multiple regions of interest by varying the field of regard to (1) a single direction, (2) the entire FOV, or (3) intermediate views of interest as required by the evolving scene environment. In this project, the investigators intend to add this variable illumination capability to existing instantaneous ranging hardware by using a liquid crystal spatial light modulator (SLM) beam steering system that adaptively varies the (single or multi) beam intensity profiles and pointing directions. For autonomous satellite rendezvous, docking, and inspection, the system can perform long-range sensing with a narrow FOV while being able to expand the FOV as the target object approaches the sensor. To this end in a previous paper, we analyzed the performance of a commercially available TOF sensor (3DVSystems' Zmini) in terms of the depth sensitivity versus target range and albedo. In this paper, we will analyze the laser system specifications versus range of field-of-view when beam steering is performed by means of a Boulder Nonlinear Systems' phase-only liquid crystal SLM. Experimental results show that the adjustable laser beam FOV extensively compensate the reflected image grayscale from objects at long range, and prove the feasibility of expanding range with the projection from the SLM.
机译：基于LIDAR的系统可测量激光源到场景并返回传感器的飞行时间，构建宽视场的3D光栅图像，但是作为扫描过程，场景内部的运动存在一些问题扫描的持续时间。通过使用宽激光脉冲同时照射整个场景，配备了高速快门的2D相机可以测量整个视场（FOV）的飞行时间，从而记录整个瞬间的瞬时快照现场。但是，散布激光会缩小范围。因此，所需要的是一种可编程的系统，该系统可以通过根据变化的场景所要求的（1）单个方向，（2）整个FOV或（3）感兴趣的中间视图改变视场来跟踪多个感兴趣的区域环境。在此项目中，研究人员打算通过使用液晶空间光调制器（SLM）光束控制系统将这种可变照明功能添加到现有的即时测距硬件中，该系统可以自适应地改变（单或多）光束强度分布和指向方向。对于自主的卫星交会，对接和检查，该系统可以以较窄的FOV执行远程感测，同时能够在目标物体接近传感器时扩展FOV。为此，我们在深度灵敏度，目标范围和反照率方面分析了商用TOF传感器（3DVSystems的Zmini）的性能。在本文中，我们将分析通过Boulder Nonlinear Systems仅相位液晶SLM进行光束转向时，激光系统规格与视场范围的关系。实验结果表明，可调激光束FOV可广泛补偿远距离物体的反射图像灰度，并证明了用SLM投影扩大范围的可行性。

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