• Volker Ebert
  • Jürgen Wolfrum
Part of the Heat and Mass Transfer book series (HMT)


Absorption spectroscopy is one of the oldest techniques of non-intrusive investigation of gaseous media. In this technique the radiation emitted by a source towards a radiation detector is absorbed along its way to the detector. This loss is monitored and analyzed for its dependence on wavelength. Absorption is widely used for industrial gas analysis because of its simplicity, low cost and effectiveness. Nevertheless it is still an area of active research. Up to the late sixties most spectroscopic data was gained only with the help of broadband sources and monochromators or filters, however, with the development of lasers, research gained an important tool to improve the quality of the data and, more importantly, to access completely new areas for the application of non-intrusive optical measurements. These new possibilities are based on the superior properties of laser radiation which include high spectral resolution, very high spectral power density and directivity of the radiation. Chemical analysis and determination of temperature by optical methods in some cases has already been made possible or could be carried out much more specifically with these features, while signal to noise and sensitivity could be enhanced dramatically.


Absorption Line Harmonic Signal Line Strength Linear Absorption Coefficient Lorentzian Line Shape 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • Volker Ebert
  • Jürgen Wolfrum

There are no affiliations available

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