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相关概念视频

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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基于传输光放大的灵敏光诱导热弹性光谱

Zhenfeng Gong1, Ruoran Kan1, Mingzhe Li1

  • 1Dalian University of Technology, Dalian, Liaoning 116024, China.

Photoacoustics
|August 21, 2025
PubMed
概括

高精度的气体检测是通过光诱导热弹性光谱 (LITES) 和传输光放大来实现的. 这种方法提高了信号与噪声的比率,即使在低光强度下也能进行敏感的测量.

科学领域:

  • 光谱学
  • 光学传感器
  • 气体分析

背景情况:

  • 光诱导热弹性光谱 (LITES) 是一种气体检测技术.
  • 改善信号噪声比 (SNR) 和最小检测极限 (MDL) 是高精度气体分析的关键.
  • 低光强度测量在实现高灵敏度方面存在挑战.

研究的目的:

  • 通过光感应热弹性光谱 (LITES) 检测传输光放大效果,以实现高精度的气体检测.
  • 在弱光条件下显示高SNR和低MDL.
  • 探索LITES传感器中增加光路长和光束反射的可能性.

主要方法:

  • 使用具有100个反射和16米光学长度的多通道电池.
  • 使用模块化激光束与光学放大器相连.
  • 包含一个窄带光纤过器 (0.8纳米带宽) 和光纤减弱器.

主要成果:

  • 通过传输光放大,实现了3.6倍的信号噪声比 (SNR).
  • 在传输光强度为0.048μW的情况下,获得了1823的高SNR和0.110ppm的最小检测极限 (MDL).
  • 在μW的光强度水平上证明了高精度的气体检测能力.
关键词:
光诱导热弹性光谱学光学放大器光学过器二次波信号

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结论:

  • 传输的光放大显著提高了LITES中的SNR,使得在低光强度下能够高精度检测气体.
  • 采用LITES放大方法可以增加光路长度和光束反射,提高传感器性能.
  • 这种技术为开发灵敏且强大的气体传感系统提供了有前途的途径.