Special Methods and Applications

SPECIAL METHODS AND APPLICATIONS 5.1. Difference Absorption Spectroscopy 

Except for the typical support of spectroscopy by computers, the above-mentioned manipulation of spectra for an automatic recording as well as computerized devices are qualified to be used in process control with online data acquisition and inline control functions reacting to threshold parameters in automatic monitoring. In addition, computers are applied in library searches for similarities of the measured spectra by use of structural retrieval algorithms or neuronal nets. Even spectra in the UV/Vis are not characteristic, such libraries can be used to store calibration spectra, including disturbing factors [31,32]. 

Such computerized equipment can be integrated in laboratory and information management systems, which send evaluated data and facts to a central processing unit, where they are combined with information from other examinations [33,34]. 

(1) a general form of the Lambert-Beer law was given taking into account that solutions can contain more than one compound. This equation can be explicitly written in the form  

It represents a linear system of differential equations, which can be solved by matrix analysis and use of normal equations. The chosen wavelengths correspond for example to numbers written at the axis in Fig. 5b ( i = 300, X2 = 400, = 500). At these wavelengths the three pure 

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