Optical sensor based on sensitive polymer layer

Matthias Will; Tomas Martan; Ralf Müller; Olaf Brodersen; Gerhard J. Mohr

doi:10.1117/12.817974

18 November 2008 Optical sensor based on sensitive polymer layer

Matthias Will, Tomas Martan, Ralf Müller, Olaf Brodersen, Gerhard J. Mohr

Proceedings Volume 7138, Photonics, Devices, and Systems IV; 71380A (2008) https://doi.org/10.1117/12.817974
Event: Photonics, Devices, and Systems IV, 2008, Prague, Czech Republic

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.

Citation Download Citation

Matthias Will, Tomas Martan, Ralf Müller, Olaf Brodersen, and Gerhard J. Mohr "Optical sensor based on sensitive polymer layer", Proc. SPIE 7138, Photonics, Devices, and Systems IV, 71380A (18 November 2008); https://doi.org/10.1117/12.817974

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