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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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Atomic Fluorescence Spectroscopy01:29

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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
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相关实验视频

Updated: Mar 15, 2026

Detection and Isolation of Circulating Melanoma Cells using Photoacoustic Flowmetry
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基于紫外线光声谱的高流速微量甲检测,使用长共振光声细胞.

Qianjin Gan1, Zhongqi Feng2, Deng Zhang2

  • 1School of Optoelectronic Engineering, Xidian University, Xi'an 710071, China.

Sensors (Basel, Switzerland)
|March 14, 2026
PubMed
概括

一个新的紫外光声谱学 (UV-PAS) 系统提供了灵敏,稳定和实时的甲 (H2CO) 检测. 这种先进的系统克服了传统方法的局限性,使得即使在高气流速下,也可以进行可靠的监测.

关键词:
甲检测器 甲检测器高气体流速,高气体流速.紫外线光声谱学超紫外线光声谱学

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相关实验视频

Last Updated: Mar 15, 2026

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科学领域:

  • 环境科学 环境科学
  • 分析化学 分析化学
  • 频谱学是一种光谱学.

背景情况:

  • 甲 (H2CO) 是一种危险的挥发性有机化合物,在室内和工业环境中普遍存在.
  • 对H2CO的实时,敏感的检测对于环境安全至关重要.
  • 传统的光声谱法 (PAS) 方法在灵敏度,稳定性和高流速操作方面存在问题.

研究的目的:

  • 开发一种用于甲检测的新型紫外线光声谱 (UV-PAS) 系统.
  • 在H2CO监测中实现高灵敏度和长期稳定性.
  • 克服传统PAS系统的局限性,特别是它们对低气体流速的依赖.

主要方法:

  • 开发使用320nm紫外线激光源的UV-PAS系统.
  • 集成了一个紧的差分光声学电池 (PAC),优化了声学共振和流动干扰抑制.
  • 在 (N2) 背景下运行,仔细优化共振器长度和缓冲区配置.

主要成果:

  • 紫外线-PAS系统在高流速250sccm时显示出稳定的光声学响应.
  • 光声细胞的共振频率达到了1767赫兹,质量系数为46.
  • 确定了2.50ppm (1秒) 和88.1ppb (2202秒) 的最低检测极限,具有线性响应 (R2 = 0.98844).

结论:

  • 拟议的UV-PAS系统为实时微量甲检测提供了一种灵敏,稳定和具有成本效益的解决方案.
  • 该系统在高气体流速下表现出强大的性能,提高了其实际适用性.
  • 这项技术在环境和工业安全应用中具有持续在线监控的巨大潜力.