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相关概念视频

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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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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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
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Precision Implementation of Minimal Erythema Dose MED Testing to Assess Individual Variation in Human Inflammatory Response
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采用高分辨率分散反射光谱的标准化in vivo方法来评估防晒对紫外线A和高能可见光的有效性.

Rita Touti1, Pascale Renoux1, Hicham Nocairi1

  • 1L'oréal Research and Innovation, Chevilly-Larue, France.

Photodermatology, photoimmunology & photomedicine
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概括

准确的防晒评估需要精确的测量方法. 使用高分辨率光谱学可确保可靠的对UVA和高能可见光 (HEV) 的保护评估,与插值方法不同.

关键词:
高分辨率的扩散反射光谱学.防晒剂是一种防晒剂.紫外线A是一种紫外线.可见光 可见光 可见光.

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科学领域:

  • 皮肤病学 皮肤病学
  • 照相保护 照相保护
  • 频谱学是一种光谱学.

背景情况:

  • 标准化防晒评价对于有效保护紫外线 (UV) 和高能可见光 (HEV) 非常重要.
  • 个别的皮肤类型和状况需要定制的防晒策略.

研究的目的:

  • 调查标准化防晒性能评估的方法考虑.
  • 评估对UVA,特别是长时间UVA1和HEV光的保护.

主要方法:

  • 一项涉及15名受试者的体内研究评估了6种商业防晒.
  • 采用混合扩散反射光谱 (HDRS) 采用1纳米步骤 (310-450纳米).
  • 结果与使用四个离散波长 (365,405,435,450 nm) 的线性插值方法进行了比较.

主要成果:

  • 高分辨率光谱分析 (1纳米步骤) 提供了一致的防晒排名.
  • 从离散波长的线性插值导致不一致的排名和错误分类.
  • 在380-400纳米范围内发现了差异,影响了保护评估.

结论:

  • 用纳米级测量的分散反射谱学准确地确定紫外线和HEV范围内的防晒吸收概况.
  • 防晒的性能特征是依赖于方法的.
  • 从更广泛的波长波段进行线性插值,可能会产生不准确的结果.