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Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

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Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
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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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相关实验视频

Updated: Jul 19, 2025

Author Spotlight: A Stable Phantom Material for Optical and Acoustic Imaging
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Author Spotlight: A Stable Phantom Material for Optical and Acoustic Imaging

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测量高度扩散材料的光学性能.

Mathieu Nguyen1, Jean-Baptiste Thomas1,2, Ivar Farup1

  • 1Department of Computer Science, Norwegian University of Science and Technology (NTNU), 2815 Gjøvik, Norway.

Sensors (Basel, Switzerland)
|August 12, 2023
PubMed
概括

这项研究引入了一种新的方法来测量扩散材料中吸收和散射等光学特性. 该技术准确地确定了牛奶脂肪含量,显示了分析类似物质的前景.

关键词:
BSSRDF 的意思是什么?吸收系数 的吸收系数.图像成像设备的设备.逆转模型的逆转模型物质的外观物质的外观降低了分散系数的降低.

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相关实验视频

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科学领域:

  • 光学是什么?光学是什么?光学是什么?
  • 材料科学 材料科学 材料科学
  • 生物物理学的生物物理.

背景情况:

  • 测量高度扩散材料的光学特性,由于高反射率和潜在的传感器和,提出了挑战.
  • 现有的方法可能会与呈现白色或过度和的材料作斗争.
  • 精确的光学特性表征对于各种科学和工业应用至关重要.

研究的目的:

  • 开发和验证一种反向方法,用于从单个反射率测量中确定高度扩散材料的吸收和减少散射系数.
  • 通过将光学特性与牛奶样本的脂肪含量相关联来评估方法的有效性.
  • 探索该方法对其他分散材料 (如白色油漆和纸张) 的适用性.

主要方法:

  • 使用空间解析方法与非线性信任区域算法相结合,以适应法雷尔扩散理论模型.
  • 开发了一种反转技术,从反射率数据中提取两个光学特性 (吸收和减少的散射系数).
  • 使用不同脂肪含量的牛奶样本,白色油漆和纸张验证了该方法.

主要成果:

  • 开发的方法成功估计了扩散材料的吸收和降低了分散系数.
  • 牛奶样本的结果显示,光学特性和脂肪含量之间存在强烈的线性相关性 (R2>0.94).
  • 获取的吸收系数在1 × 10-3至8 × 10-3mm-1之间,而牛奶的分散系数在3至8mm-1之间.
  • 该方法在高度扩散的同位素材料中表现出有效性,尽管纸质分析的相关性不太明显.

结论:

  • 拟议的反向方法提供了一种可靠的方法,可以使用单个反射度测量来测量高度扩散材料的光学特性.
  • 该技术通过其准确地将牛奶脂肪含量与测量的光学性能相关联的能力来验证.
  • 这种方法在各种科学领域提供了一种有价值的工具来表征分散材料.