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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Raman Spectroscopy Instrumentation: Overview01:26

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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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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Infrared (IR) Spectroscopy: Overview01:09

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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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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IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Prism interferometer for a compact Fourier-transform spectroscope.

T Kiyokura, T Ito, R Sawada

    Optics Letters
    |December 8, 2007
    PubMed
    Summary
    This summary is machine-generated.

    A new prism-scanning interferometer was developed for field-use Fourier-transform spectroscopy. This innovative design simplifies alignment and improves efficiency for portable spectrometers.

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    Area of Science:

    • Optical Engineering
    • Spectroscopy
    • Interferometry

    Background:

    • Fourier-transform spectroscopy (FTS) is a powerful technique for spectral analysis.
    • Developing field-portable spectrometers presents challenges in terms of size, complexity, and environmental sensitivity.
    • Existing interferometer designs can be sensitive to ambient conditions and require precise, time-consuming alignment.

    Purpose of the Study:

    • To develop a novel prism-scanning interferometer as a foundational component for a field-use spectrometer.
    • To overcome limitations of traditional FTS systems, particularly for portable applications.
    • To simplify the construction and operation of interferometers for field deployment.

    Main Methods:

    • A prism-scanning interferometer was designed and constructed.
    • The interferometer utilizes a sliding triangular prism with two mirror surfaces coupled to a fixed triangular-prism beam splitter.
    • The design was tested to evaluate its operational characteristics and performance.

    Main Results:

    • The prototype prism-scanning interferometer demonstrated basic functionality.
    • The design effectively eliminates the influence of ambient air on measurements.
    • Alignment procedures were significantly simplified compared to conventional designs.
    • The optical path difference was doubled, halving the required stage-moving distance.
    • Measured spectral resolution and wavelength scale closely matched theoretical calculations.

    Conclusions:

    • The developed prism-scanning interferometer is a promising step towards practical field-use spectrometers.
    • The simplified and robust design offers advantages for portable spectroscopic instrumentation.
    • This approach addresses key challenges in deploying FTS technology outside of laboratory settings.