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Proceedings Paper

Optical sensor based on sensitive polymer layer
Author(s): Matthias Will; Tomas Martan; Ralf Müller; Olaf Brodersen; Gerhard J. Mohr
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Paper Abstract

In chemical, oil, and food industries, there are still higher requirements on miniaturization of optical sensors for a concentration measurement of gases e.g. a CO2, O2, and NH3. The paper deals with development of miniaturised optical sensor for an aqueous carbon dioxide measurement using a sensitive polymer layer. The optical sensor module consists of two parts, a remission sensor and a removable layered structure (with incorporated dyed polymer) which is closely placed on the surface of a remission sensor. A dyed polymer film is used as an optical-chemical transducer working on a principle of colour changes caused by a chemical reaction of an analyte and indicator dye. A novel remission sensor module was developed for an evaluation of the spectral absorption changes of sensitive polymer layer. The remission sensor module composed of LED diodes located in a central cavity of the sensor module and PIN diodes situated around the cavity. The LEDs emit light with optimised wavelengths and irradiate the polymer film. Light response (the changes of the spectral absorption) of the irradiated polymer film is detected by PIN diodes. A colour shift is further analyzed and evaluated by electronics without using a photometer.

Paper Details

Date Published: 18 November 2008
PDF: 7 pages
Proc. SPIE 7138, Photonics, Devices, and Systems IV, 71380A (18 November 2008); doi: 10.1117/12.817974
Show Author Affiliations
Matthias Will, CiS-Institute for Micro Sensors GmbH (Germany)
Tomas Martan, CiS-Institute for Micro Sensors GmbH (Germany)
Institute of Photonics and Electronics (Czech Republic)
Ralf Müller, CiS-Institute for Micro Sensors GmbH (Germany)
Olaf Brodersen, CiS-Institute for Micro Sensors GmbH (Germany)
Gerhard J. Mohr, Friedrich-Schiller-Univ. Jena (Germany)


Published in SPIE Proceedings Vol. 7138:
Photonics, Devices, and Systems IV

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