• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文OA文献 >Compressive sensing optical coherence tomography using randomly accessible lasers
【2h】

Compressive sensing optical coherence tomography using randomly accessible lasers

机译：使用随机可及激光的压缩感测光学相干断层扫描

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We propose and demonstrate a novel a compressive sensing swept source optical coherence tomography (SSOCT) system that enables high speed images to be taken while maintaining the high resolution offered from a large bandwidth sweep. Conventional SSOCT systems sweep the optical frequency of a laser ω(t) to determine the depth of the reflectors at a given lateral location. A scatterer located at delay τ appears as a sinusoid cos (ω(t)τ ) at the photodetector. The finite optical chirp rate and the speed of analog to digital and digital to analog converters limit the acquisition rate of an axial scan. The proposed acquisition modality enables much faster image acquisition rates by interrogating the beat signal at randomly selected optical frequencies while preserving resolution and depth of field. The system utilizes a randomly accessible laser, a modulated grating Y-branch laser, to sample the interference pattern from a scene at randomly selected optical frequencies over an optical bandwidth of 5 THz , corresponding to a resolution of 30 μm in air. The depth profile is then reconstructed using an l_1 minimization algorithm with a LASSO constraint. Signal-dependent noise sources, shot noise and phase noise, are analyzed and taken into consideration during the recovery. Redundant dictionaries are used to improve the reconstruction of the depth profile. A compression by a factor of 10 for sparse targets up to a depth of 15 mm in noisy environments is shown.
机译：我们提出并演示了一种新颖的压缩感测扫频光源光学相干断层扫描（SSOCT）系统，该系统能够在保持大带宽扫描所提供的高分辨率的同时拍摄高速图像。常规的SSOCT系统扫描激光的光频率ω（t）以确定给定横向位置上反射镜的深度。位于延迟τ处的散射体在光电探测器处显示为正弦余弦（ω（t）τ）。有限的线性chi速率以及模数转换器和数模转换器的速度限制了轴向扫描的采集速率。所提出的采集方式通过在随机选择的光学频率下询问拍子信号，同时保留分辨率和景深，可以实现更快的图像采集速率。该系统利用随机可访问的激光（调制光栅Y分支激光）以5 THz的光学带宽（对应于空气中30μm的分辨率）以随机选择的光学频率从场景中采样干涉图样。然后使用具有LASSO约束的l_1最小化算法重建深度轮廓。在恢复过程中，分析并考虑了与信号相关的噪声源，散粒噪声和相位噪声。冗余字典用于改善深度轮廓的重建。在嘈杂的环境中，对于稀疏的目标，压缩深度为15毫米，压缩率为10倍。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号