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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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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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The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte...
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Compact Grism-Based High-resolution Colorimetric Sensing System for Liquid Samples.

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    Summary
    This summary is machine-generated.

    We developed a semi-autonomous device for precise absorbance spectrum measurement. This system achieves high spectral resolution (0.38 nm) and intensity precision using integrated optical, microfluidic, and electronic modules.

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    Area of Science:

    • Spectroscopy
    • Analytical Chemistry
    • Microfluidics

    Background:

    • Existing spectrophotometry methods face challenges with spectral resolution and intensity precision.
    • Accurate absorbance spectrum measurement is crucial for various scientific analyses.

    Purpose of the Study:

    • To propose and develop a semi-autonomous device for high-resolution, high-precision absorbance spectrum measurement.
    • To integrate optical, microfluidic, and electronic modules for a comprehensive analytical system.

    Main Methods:

    • The system utilizes a polychromator spectrophotometer with a Grism diffractive component for high spectral resolution.
    • A filter monochromator is incorporated for enhanced intensity precision.
    • Integrated microfluidics handle sample manipulation, while an electronic module manages control and data acquisition via a user interface.

    Main Results:

    • The developed system demonstrated a spectral resolution of 0.38 nm when tested with a mercury-argon lamp.
    • The integrated design successfully combined optical, microfluidic, and electronic functionalities.

    Conclusions:

    • The proposed semi-autonomous device offers a significant advancement in absorbance spectrum measurement capabilities.
    • This technology addresses limitations in spectral resolution and intensity precision, enabling more accurate sample analysis.