Sensors and Actuators - Fachbereich Physik der Universität ...

Quelle: http://www.anc.univie.ac.at/deutsch/sensor/chemosensoren/transducer.html
Optische Gassensoren
Fluoreszenz-O2-Optrode (optical electrode) - Sauerstoff-Gassensor
Fluorescent optrodes utilize the fluorescence quenching of special indicator dyes. In this
cases, the incident light excites a secondary Iight emission with a different wavelength.
Several sensor types were developed for measuring the partial pressure of molecular
oxygen in liquids, for instance, in blood. The fluorescent dye, such as perylene dibutyrate, is
absorbed to organic beds contained within a hydrophobic gas permeable membrane, such
as porous polyethylene tubing. The dye is excited with blue light (468 nm) and it emits
radiation at 514 nm (green).
The oxygen partial pressure can be calculated according to the Stern-Volmer equation:
where A and m are empirical constants. Fluorescent dyes can also be applied for pH
measurements and in other ion-selective optrode types.
Quelle: www.sensedu.com
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