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Photoelectric Effect

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...

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Updated: May 23, 2025

Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography

Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography

Published on: January 15, 2013

可见光两极化敏感光学连贯性断层扫描,具有平衡检测.

Bahar Baradaran¹, Adam J Black¹, Sarah R Heilbronner²

¹University of Minnesota, Department of Biomedical Engineering, Minneapolis, Minnesota, United States.

Journal of biomedical optics

|March 12, 2025

概括

我们开发了一种高分辨率可见光偏振敏感光学连贯性断层扫描 (PS-OCT) 系统. 这种先进的成像技术增强了信号噪声比和双断率灵敏度,以更清晰地可视化生物组织.

关键词:

轴的方向方向轴的方向双重破裂是什么意思保持极化的纤维纤维.减速阻抗的时间

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Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy oSLO and Optical Coherence Tomography OCT

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy oSLO and Optical Coherence Tomography OCT

Published on: August 4, 2018

科学领域:

生物医学光学生物医学光学
光学成像技术的成像
连贯断层扫描是一致的断层扫描.

背景情况:

可见光光学连贯断层扫描 (OCT) 提供了高分辨率,但可以通过信号噪声比 (SNR) 和双断层灵敏度来限制.
极化敏感的OCT (PS-OCT) 提供基于组织双折的对比度,对于可视化像原纤维这样的结构至关重要.

研究的目的:

实施和描述一个具有平衡检测 (BD) 的新型可见光PS-OCT系统.
评估系统对生物组织成像的性能,重点是空间分辨率和双断层灵敏度.

主要方法:

一个光谱域PS-OCT系统是使用独特的干扰仪和定制光谱仪设计的.
实现了平衡检测 (BD),用单个摄像头捕捉了四个对齐的光谱,从而实现了改善SNR的减法.
系统性能是通过测量轴分辨率,BD性能和使用可变延迟器进行延迟测量来进行的.

主要成果:

该系统实现了高分辨率可见光PS-OCT与有效的平衡检测.
证实了信号噪声比 (SNR) 的改善和双断率灵敏度.
生物组织的成像显示了双断层结构的增强划分.

结论:

实施的高分辨率可见光PS-OCT的BD显著提高了SNR和双断率灵敏度.
这一进步使生物组织中的双断层结构能够更好地可视化.
该系统为生物医学成像提供了新的机会,特别是用于解析纤维结构.