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Related Concept Videos

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 Absorption Spectroscopy: Interference01:25

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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...
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IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

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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.
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Atomic Absorption Spectroscopy: Instrumentation01:22

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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
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H2O absorption spectroscopy via focused laser differential interferometry.

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    This study introduces absorbing-FLDI (A-FLDI), a new method combining focused laser differential interferometry with tunable diode laser absorption spectroscopy. The technique successfully measures methane-air flame properties and significantly reduces path-integration effects.

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    Area of Science:

    • Fluid dynamics
    • Laser-based measurement techniques
    • Spectroscopy

    Background:

    • Focused laser differential interferometry (FLDI) is a valuable tool for flow analysis.
    • Simultaneous absorption spectroscopy (AS) measurements are crucial for detailed flow characterization.
    • Integrating AS with FLDI presents an opportunity to enhance flow measurement capabilities.

    Purpose of the Study:

    • To demonstrate a modified FLDI technique capable of simultaneous absorption spectroscopy measurements.
    • To evaluate the performance of this absorbing-FLDI (A-FLDI) technique in a Hencken burner plume.
    • To explore the potential of A-FLDI for reducing path-integration effects and enabling spatially resolved flow measurements.

    Main Methods:

    • Modification of focused laser differential interferometry (FLDI) using an infrared tunable diode laser (TDL).
    • Implementation of simultaneous absorption spectroscopy (AS) measurements.
    • Testing the A-FLDI technique on a Hencken burner plume with a methane-air flame.
    • Comparison with traditional TDLAS and electrical hygrometer measurements.

    Main Results:

    • The A-FLDI technique successfully detected five distinct absorbance peaks of the methane-air flame.
    • The method retained the expected behavior of standard FLDI.
    • Significant reductions in path-integration (PI) length were observed, ranging from 82% to 84%.

    Conclusions:

    • The developed A-FLDI technique enables simultaneous flow property analysis (pressure, temperature, molecular density) and absorption spectroscopy.
    • A-FLDI offers a promising approach to mitigate path-integration effects in AS.
    • This advancement paves the way for more precise, spatially and temporally resolved local flow measurements.