基于光波映射展宽技术的稀疏图像实时获取

A real-time sparse imaging system based on the optical mapping and boardening technology

针对传统成像技术的成像速度慢且灵敏度低,本文采用光波映射展宽技术搭建一个一维稀疏图像实时获取系统,以实现高速图像的实时获取。基于空间光栅的空-频映射以及色散光纤的频-时映射,充分利用傅里叶变换的色散效果,使得系统简化并能够实现实时处理的性能。从光栅公式入手,对系统的量程和空间分辨率进行了初步分析,并通过系统实验将上述理论结果进行验证。实验表明,本文系统能够将一维的条形码以20.9 MHz的帧率在示波器上实时成像,比目前的常用成像技术高4个量级。

Traditional imaging technologies can neither capture ultrafast processes nor get high sensitivity in their imagirlg processes. This paper aims to build an ultrafast one-dimensional real-time imaging sys- tem which is based on the optical mapping and boardening technology. By the use of optical image ampli- fication, we realize the system with both ultrafast continuous real-time imaging and high sensitivity. This system makes full use of the dispersive Fourier transform in order to simplify the construction of the system and realize the real-time image processing, while the system is based on the space-frequency map- ping of the spatial grating and the frequency-time mapping of the dispersive fiber. Besides, this paper dis- cusses not only the system measuring range but also the spatial resolution from both the grating formula and the features of the gratings and other components of the system. We get some ideal experimental re- sults to verify the system performance. As a result,we get real-time imaging at a frame rate of 20. 9 MHz,which is 4 orders of magnitude higher than that of the traditional imaging system. Our system measuring range is about 7.0 ram,while the spatial resolution can reach as low as 280.