基于单片机的氧气检测仪英文原版参考文献word版.doc

0925-4005/$ – see front matter ? 2006 Elsevier B.V. All rights reserved. doi:10.1016/j.snb.2006.03.056 Sensors and Actuators B 121 (2007) 629–638 Microcontroller-based portable instrument for stabilised optical oxygen sensor Alberto J. Palmaa, Javier L′opez-Gonz′alezb, Luis J. Asensioa, Maria Dolores Fern′andez-Ramosb, Luis Fermin Capit′an-Vallveyb,~ a Department of Electronics and Computer Technology, Campus Fuentenueva, Faculty of Sciences,University of Granada, E-18071 Granada, Spainb Solid Phase Spectrometry Research Group, Department of Analytical Chemistry, Campus Fuentenueva,Faculty of Sciences, University of Granada, E-18071 Granada, Spain Received 26 January 2006; received in revised form 13 March 2006; accepted 14 March 2006Available online 5 June 2006 Abstract A novel measurement system comprised of a portable electronic instrument with an opto-chemical sensor for atmospheric oxygen sensing is presented. Optical sensors based on luminescence quenching have been thoroughly investigated in the search for sufficient sensitivity and high stability. The dye platinum octaethylporphyrin complex immobilised in a polystyrene membrane was selected as an oxygen probe that was stabilised with the heterocyclic amine DABCO, achieving in this way a mean drift of 0.01% oxygen concentration per day. The portable instrument is based on a microcontroller. Its main features are: a single optical sensor channel, lack of optical filters, fully digital signal processing, autonomous operation with computer communication capability for reprogramming and data saving and low power consumption. The use of a digital output photodetector makes it possible to avoid analogue processing with the consequent circuitry saving and better noise immunity. The measured parameter in the transduction process is quite similar to the luminescence lifetime. The typical measurement range is from 0 to 30% oxygen and the response time is below 30 s for full range swing. Typical instrument charact