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関連する概念動画

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 Spectroscopy: Beer–Lambert Law01:09

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The Beer-Lambert law describes the relationship between absorbance and concentration, which combines the principles established by scientists Johann Heinrich Lambert and August Beer. Lambert's law states that when light passes through a medium, the loss in intensity is directly proportional to the original intensity and the path length of the light. Beer's law proposed that the transmittance of a solution remains constant if the product of concentration and path length is constant. The modern...
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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.
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Measuring Spatially- and Directionally-varying Light Scattering from Biological Material
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非線形性修正配列スペクトロラジオメーターを使用して0/45反射率の測定.

Zhifeng Wu, Shize Wang, Xiaofeng Lu

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    まとめ
    この要約は機械生成です。

    正確な反射率因子測定には,システムの線形性が必要です. この研究では,精密な反射率と線形性校正のための光学セットアップを提示し,配列スペクトル放射計の不確実性を最小限に抑えています.

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    科学分野:

    • 光学工学は,光学工学である.
    • メトロロジー・メトロロジー
    • スペクトル放射測定法

    背景:

    • 反射率の測定は幅広いダイナミックレンジをカバーし,精度のために非常に線形なシステムを必要とします.
    • 既存の方法は非線形性やスペクトル散乱光による課題に直面しており,測定の不確実性に影響を及ぼしています.

    研究 の 目的:

    • 反射率因子測定のための光学構成を記述する.
    • 同じセットアップ内で線形性測定を可能にするために.
    • 反射率因子の決定における測定不確実性を最小限にするために.

    主な方法:

    • ブラックボディ・ソース,アプチュール,ホワイト・ディフューザーを統合した線形性校正装置を開発した.
    • 保証されたスペクトル放射と分布は,集積球からの反射率因子測定と一致します.
    • 反射率因子と線形性評価の両方の光学構成を変更しました.

    主要な成果:

    • カリブレーション装置は,球状光源を統合する際のスペクトル放射範囲を同一にします.
    • セットアップは,非線形性とスペクトル散乱光のインパクトを大幅に軽減します.
    • 380~780 nmの白色分散ターゲットの0.20%~0.54% (k=2) の 0/45 反射率因子測定不確実性を達成した.

    結論:

    • 説明されている光学構成は,配列スペクトル放射計を使用して反射率因子測定のための便利で正確な方法を提供します.
    • 統合された線形性校正は不確実性を最小限に抑え,スペクトル測定の信頼性を高めます.
    • このアプローチは,可視スペクトル全体にわたる分散反射度測定の精度を向上させます.