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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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Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.
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High-definition Fourier Transform Infrared FT-IR Spectroscopic Imaging of Human Tissue Sections towards Improving Pathology
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多分析仪检测用基于地表的中红外显微光谱仪进行测量.

Henry Tan1,2, Jiajun Meng1,2, Kenneth B Crozier1,2,3

  • 1School of Physics, University of Melbourne, Parkville, Victoria 3010, Australia.

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概括

这项研究引入了一种紧的超表面微光谱仪,用于同时检测多种化学物质,特别是汽油中的乙醇和甲醇. 这种新型设备实现了精确的燃料质量监测,扩大了中红外光谱学的应用.

关键词:
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科学领域:

  • 中红外 (MIR) 光谱学
  • 化学传感器是一种化学传感器.
  • 纳米光子学 纳米光子学

背景情况:

  • 传统的富里埃变换红外光谱仪 (FTIR) 是庞大而昂贵的.
  • 对于用于现场应用的便携式,具有成本效益的微光谱仪的需求正在增加.
  • 过器阵列探测器阵列微光谱仪为in situ传感提供了一个紧,强大的平台,但通常专注于单个分析物的检测.

研究的目的:

  • 为了证明使用超表面波器阵列微光谱仪同时检测多个分析仪.
  • 将这项技术应用于汽油中乙醇和甲醇度的实时监测.
  • 扩大基于地表MIR光谱仪的能力,超出单个分析物识别范围.

主要方法:

  • 制造一个超表面,由层中的周期性亚波长孔组成,以创建带通波器.
  • 使用反向镜头设置,用微波计对过器阵列进行成像.
  • 化学测量模型的开发和应用,包括部分最小平方 (PLS) 和支向量机回归 (SVR),用于定量分析.
  • 测试不同乙醇和甲醇含量 (0-20%v/v) 的汽油混合物的测试模型.

主要成果:

  • 超表面波器阵列微光谱仪成功地同时监测了乙醇和甲醇度.
  • 使用立方内核的支持向量机回归 (SVR) 模型产生了最佳性能.
  • 实现了乙醇的1.23%v/v和甲醇的1.84%v/v的预测平均平方根误差 (RMSEP).
  • 确定了4.22%v/v的乙醇和6.86%v/v的甲醇的伪无变检测极限.

结论:

  • 超表面波器阵列微光谱仪可以实现同时多分析体检测.
  • 这项技术适用于实际应用,如燃料质量监测.
  • 这项研究显著扩大了基于地表的MIR光谱仪的潜在应用.