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相关概念视频

Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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相关实验视频

Updated: Jun 7, 2025

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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单双网格干涉度与两个固有的相位移干涉图.

Saifollah Rasouli, Samaneh Khoshkhatti

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    概括
    此摘要是机器生成的。

    这项研究引入了一种新的双干扰测量方法,用于分析相位样本. 该技术提供了快速,准确的相提取,没有复杂的算法,非常适合动态样本.

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    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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    The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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    相关实验视频

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    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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    科学领域:

    • 光学和光子学 在光学和光子学.
    • 干涉测量是干涉测量的方法.
    • 相对照显微镜相对照显微镜

    背景情况:

    • 传统的干扰测量方法通常需要复杂的相位移动步骤,对振动敏感.
    • 分析动态相样本,如生物标本,由于速度和稳定性限制而存在挑战.

    研究的目的:

    • 开发一种新的,自我引用的,通路干涉测量技术,用于快速准确地测量缓慢变化的相位样本的相位.
    • 证明该方法对动态样本的适用性及其与传统方法相比的优势.

    主要方法:

    • 一个双网格干涉测量设置,使用两个衍射顺序 ((0,+1) 和 (+1,0)) 在单个中创建同步的相位移干涉图.
    • 精确控制格子分隔,以在干扰光束之间引入特定的相差.
    • 该方法的应用是用纳米粒子在非线性液体样本中研究热透镜.

    主要成果:

    • 提出的方法成功地从一对固有的相位移交干扰图中提取相位信息,而无需外部相位移.
    • 使用弧形函数准确地重建相位模式,绕过了对相位变化<π的福里埃变换和相位重建算法的需求.
    • 该技术实现了实时操作,相提取速度比基于富里埃的方法快60倍.

    结论:

    • 这种新的双干扰测量方法简单,准确,不敏感于振动,适合分析动态样本.
    • 它提供了显著的速度优势,并且在某些条件下消除了对参考干扰图或复杂相位重建算法的需求.
    • 该技术对近乎透明的生物和其他动态的毫米尺度样本进行实时分析非常有希望.