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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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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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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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Related Experiment Video

Updated: May 2, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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[Study on CO2 measurement using tunable multi-mode diode laser absorption spectroscopy].

Guang-Zhen Gao1, Bao-Xue Chen2, Bo Hu3

  • 1School of Optical-electrical Computer Engineering University of Shanghai for Science Technology Shanghai 200093 China. ggzz8848@163.com

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|March 12, 2014
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Tunable diode laser absorption spectroscopy (TDLAS) offers reliable carbon dioxide detection. This multi-mode laser system provides accurate, stable measurements for ambient air monitoring.

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Area of Science:

  • Gas Spectroscopy
  • Laser Technology

Context:

  • Tunable diode laser absorption spectroscopy (TDLAS) is a mainstream gas detection technique.
  • Single-mode lasers face challenges with thermal and mechanical fluctuations.
  • Multi-mode lasers offer enhanced stability and reliability.

Purpose:

  • To develop and validate a multi-mode diode laser system for carbon dioxide detection.
  • To combine correlation spectroscopy and wavelength modulation spectroscopy (TMDL-COSPEC-WMS) for improved accuracy.
  • To assess the system's performance in controlled CO2/N2 mixtures.

Summary:

  • A multi-mode FP laser system utilizing TMDL-COSPEC-WMS was employed for CO2 measurement at 1570 nm.
  • CO2 concentrations were derived from normalized WMS-2f signal peaks against reference signals.
  • High linearity (0.9987) and a detection limit of 335 ppm·m were achieved over a 0.6%-30% concentration range.

Impact:

  • The system demonstrated high accuracy and stability, with a standard deviation of 0.0367% over 20 measurements.
  • Results confirm the system's potential utility for accurate carbon dioxide detection in ambient air.
  • The approach overcomes limitations of single-mode lasers in long-term monitoring applications.