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相关概念视频

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

532
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
532
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

600
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
600
IR Spectrometers01:25

IR Spectrometers

1.5K
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...
1.5K

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相关实验视频

Updated: Sep 11, 2025

Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy
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使用声光调节过器的拉曼测量空间异质拉曼光谱仪,具有等级镜结构.

Fuguan Li, Shuo Yu, Xiaotian Li

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    一种基于波器的新型声光调节式等镜空间异质拉曼光谱仪 (AOTF-EMSHRS) 提高了详细化学分析的信号噪声比. 这种先进的拉曼光谱仪为复杂样品提供了高分辨率和广谱检测.

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    Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging
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    科学领域:

    • 频谱学是一种光谱学.
    • 分析化学 分析化学
    • 光学工程是指光学工程.

    背景情况:

    • 拉曼光谱对于分子鉴定至关重要.
    • 现有的空间异质拉曼光谱仪在信号噪声比 (SNR) 和光谱范围方面存在局限性.
    • 集成声光调节过器 (AOTF) 提供了快速波长选择和性能提高的潜力.

    研究的目的:

    • 开发和评估一个声学光学调节的过器镜空间异质拉曼光谱仪 (AOTF-EMSHRS).
    • 在光谱分辨率,SNR和检测范围方面评估AOTF-EMSHRS的性能.
    • 证明仪器分析复杂有机和无机样本的能力.

    主要方法:

    • 整合一个AOTF与 echelle格子和镜面空间异质体检测系统.
    • 优化光路径以实现高分辨率和广谱覆盖.
    • 对各种物质,溶液和混合物的实验分析,比较具有和没有AOTF集成的性能.

    主要成果:

    • AOTF-EMSHRS的理论分辨率为1.53厘米-1和检测范围为100-4397厘米-1.
    • 与没有AOTF的系统相比,AOTF-EMSHRS系统的SNR至少提高了两倍.
    • 成功检测和分析各种样品,包括不同度的溶液和不同容器中的混合物.

    结论:

    • AOTF-EMSHRS是一种高效的拉曼光谱仪,具有增强的SNR和光谱能力.
    • 该仪器在复杂的样本分析和识别方面表现出色.
    • 这项技术为各种科学应用提供了拉曼光谱学的重大进步.