Author Affiliations
Abstract
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
A stable and broadband microwave photonic phase shifter based on the combined use of a linear chirped fiber Bragg grating and optical single-sideband (OSSB) modulation is proposed and experimentally demonstrated. The quality of the radio frequency (RF) signal is improved by the spectral separation delay processing. The theoretical fundamentals of the scheme are explained and the phase shift can be controlled linearly by the wavelength of the light source. In the experiment, a full 360° phase shift with a 10 GHz bandwidth can be achieved and tuned dynamically, continuously, and stably.
060.3735 Fiber Bragg gratings 060.4510 Optical communications 060.5625 Radio frequency photonics Chinese Optics Letters
2016, 14(4): 040601
1 中国科学院沈阳自动化研究所, 辽宁 沈阳 110016
2 中国科学院沈阳自动化研究所扬州工程技术研究中心, 江苏 扬州 225127
3 浙江理工大学机械与自动控制学院, 浙江 杭州 310018
线结构光视觉传感器的标定精度直接关系到测量结果的精度。传统的有模型标定方法为了提高标定精度，相应的模型也会越复杂，计算量也很大。为了实现高精度、高效率、低成本地标定线结构光视觉传感器，提出一种基于标准量块的线结构光视觉传感器直接标定方法，设计了标定靶标，不需要标定模型，直接建立查找索引表，在查找索引表中搜索直接得到或者采用最小二乘法拟合算法得到待标定点的空间三维坐标。实验结果表明该标定方法具有较高的标定精度，y方向平均绝对测量误差为0.0279 mm，z方向平均绝对测量误差为0.0237 mm，能够满足高精度测量需要，且计算简单、易于实现。
测量 线结构光传感器 直接标定方法 标准量块 中国激光
2014, 41(11): 1108002
