• J. Wolfrum
  • V. Ebert


One of the oldest techniques of non-intrusive investigation of gaseous media is absorption spectroscopy. There the radiation emitted by a source towards a radiation detector is being absorbed along its way to the detector and this loss is monitored and analysed for its dependence on wavelength. It 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 important, 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 as there is high spectral resolution, very high spectral power density and directivity of the radiation. Chemical analysis and determination of temperature by optical methods was 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 Line Shape Function Harmonic Detection 
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© Springer-Verlag Berlin Heidelberg 1994

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  • J. Wolfrum
  • V. Ebert

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