红外与激光工程, 2019, 48 (6): 0606001, 网络出版: 2019-07-29  

阵列分束激光三维成像技术

Array beam laser three-dimensional imaging technology
作者单位
华北光电技术研究所 固体激光技术重点实验室, 北京 100015
摘要
针对现有激光三维成像中使用的面阵APD探测器相邻像元间隔较大, 导致激光利用率低从而影响探测距离的缺点, 提出阵列分束激光三维成像技术。该技术对激光发射源采用液晶空间光调制器进行衍射阵列分束, 将一束激光分成与阵列APD探测器相应的阵列子光束, 调整激光发射子光束和阵列APD探测器的位置, 使得子光束照射目标后聚焦到阵列APD探测器的像元上, 提高了整束激光的利用效率。介绍了阵列分束激光三维成像技术系统组成和工作原理, 提出采用液晶空间光调制器的方法实现阵列分束的方案, 研制了阵列分束激光三维成像原理样机, 利用研制的原理样机对采用阵列分束后的效果进行了验证。实验结果表明, 采用该技术后, 采用峰值功率10 kW、脉宽8 ns的激光源, 填充因子2/3的8×8 APD, 三维成像作用距离达到510 m, 同等条件下与不分束相比, 作用距离提升39.1%。
Abstract
Laser effective utilization rate is low because the gap between adjacent pixels in APD detectors used in laser 3D imaging is too large. Aiming to the question, the array beam laser 3D imaging technology was proposed. A laser beam of the laser radiation source was diffracted into sub-beams in array with a liquid crystal spatial light modulator, so that the laser beam can be divided into sub-beams corresponding to the array APD detector. The positions of the laser beam and array APD detectors were adjusted, so that the laser beam can irradiate on an object and focus on the effective array pixel of APD detector, the utilization efficiency of laser beam was improved. The composition and working principle of array beam laser 3D imaging system were introduced. The scheme to realize the array beam by using liquid crystal spatial light modulator was proposed The prototype of the array beam laser 3D imaging system was studied, and the result of laser array beam using the prototype was verified. The experimental result shows that 3D imaging range reaches 510 meters with peak power 10 kW, pulse width 8 ns, and 8×8 APD detector fill factor 2/3, the effect distance increases by 39.1%, compared with the laser 3D imaging system without array beam.

刘波, 赵娟莹, 眭晓林, 曹昌东, 颜子恒, 吴姿妍. 阵列分束激光三维成像技术[J]. 红外与激光工程, 2019, 48(6): 0606001. Liu Bo, Zhao Juanying, Sui Xiaolin, Cao Changdong, Yan Ziheng, Wu Ziyan. Array beam laser three-dimensional imaging technology[J]. Infrared and Laser Engineering, 2019, 48(6): 0606001.

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