Han Weiqiang, Gao Xiaodong, Fan Zhenjie, Bai Le, Liu Bo
Institute of Optics and Electronics of Chinese Academy of Sciences, Chengdu 610209, China.
Key Laboratory of Science and Technology on Space Optoelectronic Precision Measurement, CAS, Chengdu 610209, China.
Sensors (Basel). 2020 Apr 30;20(9):2550. doi: 10.3390/s20092550.
In infrared weak target detection systems, high-frequency vibrating mirrors (VMs) are a core component. The dynamic surface shape of the VM has a direct impact on imaging quality and the optical modulation effect, so its measurement is necessary but also very difficult. Measurement of the dynamic surface shape of VMs requires a transiently acquired image series, but traditional methods cannot perform this task, as, when the VM is vibrating at a frequency of 3033 Hz, using high-speed cameras to acquire the images would result in frame rates exceeding 1.34 MFPS, which is currently technically impossible. In this paper, we propose the long exposure short pulse synchronous phase lock (LSPL) method, which can capture the dynamic surface shape using a camera working at 10 FPS. In addition, our proposed approach uses a single laser pulse and can achieve the dynamic surface shape measurement on a single frame image.
在红外弱目标检测系统中，高频振动镜是核心部件。振动镜的动态表面形状直接影响成像质量和光调制效果，因此对其进行测量既必要又极具难度。测量振动镜的动态表面形状需要瞬态获取的图像序列，但传统方法无法完成此任务，因为当振动镜以3033 Hz的频率振动时，使用高速相机采集图像会导致帧率超过1.34 MFPS，这在当前技术上是不可能的。在本文中，我们提出了长曝光短脉冲同步锁相（LSPL）方法，该方法可以使用工作在10 FPS的相机捕获动态表面形状。此外，我们提出的方法使用单个激光脉冲，并且可以在单帧图像上实现动态表面形状测量。
