Institut Fuer Chemo-und Biosensorik Muenster E.v.

Roger Feldhoff

Thomas Kantimm

Frank Kowol

Thomas Huth-Fehre

In a process for recognizing organic substances in solids by measuring the spectram of the radiation which is reflected or transmitted, radiation with a wavelength between 2-4 &mgr;m is used and, for radiation of solids, unmodulated radiation is used. The radiation source should have an output of at least 50 W and the distance between the illumination optics from the solid being investigated should be at least 10 cm. Recognition is based on absorption bands of the extended oscillations of C&mdash;H bonds and sometimes the presence of absorption bands of N&mdash;H bonds. Broad band radiation is preferable for radiation of the solids, and the reflected or transmitted radiation is directed through a narrow band filter with adjustable transmission frequency. This can be advantageously formed with an acousto-optical filter.

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Münster, Germany

Roger Feldhoff