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Related Concept Videos

Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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.
The atomizer used in AAS can be either a flame atomizer or an...
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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. Samples for...
Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

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).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
UV–Vis Spectroscopy: Beer–Lambert Law01:09

UV–Vis Spectroscopy: Beer–Lambert Law

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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Related Experiment Video

Updated: Jun 22, 2026

High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis
07:55

High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis

Published on: September 22, 2017

High bandwidth absorption spectroscopy with a dispersed supercontinuum source.

Johan Hult, Rosalynne S Watt, Clemens F Kaminski

    Optics Express
    |June 24, 2009
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a fast optical gas sensor using a supercontinuum source for rapid, broad spectral acquisition. It enables high-speed methane detection with detailed spectral resolution for precise measurements.

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    High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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    High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

    Published on: December 22, 2015

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    Last Updated: Jun 22, 2026

    High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis
    07:55

    High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis

    Published on: September 22, 2017

    High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
    13:31

    High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

    Published on: December 22, 2015

    Area of Science:

    • Spectroscopy
    • Optical Sensing
    • Gas Analysis

    Background:

    • Traditional gas sensors often lack the speed and resolution for real-time, detailed molecular analysis.
    • Broad bandwidth spectral acquisition is crucial for identifying various gas species and their concentrations.

    Purpose of the Study:

    • To develop and demonstrate a novel optical gas sensor with ultrahigh wavelength sweep and repetition rates.
    • To enable quantitative measurements of methane (CH4) at high speeds.

    Main Methods:

    • Utilizing a dispersed supercontinuum source for broad bandwidth spectral acquisition.
    • Performing wavelength sweeps from 1100 nm to 1700 nm in 800 ns with 40 pm spectral resolution.
    • Conducting quantitative measurements of CH4 using 80 nm sweeps near 1665 nm at rates exceeding 100 kHz.

    Main Results:

    • Achieved wavelength sweeps covering 1100-1700 nm in 800 ns with high spectral resolution.
    • Demonstrated CH4 detection at rates over 100 kHz, analyzing key spectral features.
    • Investigated the impact of averaging on measurement precision at high acquisition rates.

    Conclusions:

    • The developed optical gas sensor offers unprecedented speed and spectral resolution for gas analysis.
    • High-speed quantitative CH4 measurements are feasible, paving the way for advanced gas sensing applications.
    • Understanding averaging effects is key to optimizing precision in ultrahigh-speed measurements.