Institut Fuer Chemo-und Biosensorik Muenster E.v.

Institut Fur Chemo Und Biusensorik Munster E.v.

Thomas Huth-Fehre

Thomas Kantimm

Frank Kowol

Karl Cammann

Roger Feldhoff

The invention relates to a method for testing the functionality of a spectrometer for faults comprising at least one radiation source, one filter arrangement for separating the radiation into different wavelength ranges, and one receiving arrangement. The invention also relates to a spectrometer comprising a fault recognition device. Reference values are generated at at least two different color temperatures of the radiation source and in the different wavelength ranges. Actual received signals at at least two color temperatures to be set are compared with the reference values in order to test the spectrometer. In the occurrence of variations, the type of variation is determined according to the wavelength ranges and the color temperatures, and definite faults are concluded from the type of variation.

Method for testing the functionality of a spectrometer and a spectrometer comprising a fault recognition device

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.

Process and device for recognizing organic substances

Process for determining the surface state of highways in particular, and

Growing community of inventors

Altenberge, Germany

Thomas Huth-Fehre