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• W2187255085 abstract "A new dissolved oxygen sensor for marine applica- tion was developed and first tests in the field were carried out. The sensor uses a micro-electrode as the sensing element that has an inherently fast response and an increased resistance to bio- fouling due to the properties of the electrode material, platinum, and the employed operation repime. Introduction of a cleaning cycle, where the potential applied to the electrode is altered, allows the elimination of material building up at the electrode surface as well as the reconditioning of the electrode-surface, thus minimizing drift and the effect of bio-fouling. Micmdisc electrodes ranging between 10 and SO pm diameter have been tested. The sensor has been adapted to operate on a CTD system or on towed instrument platforms. Results of test cruises will be presented, I. INTRODUCTION Dissolved oxygen sensors for oceanographic applications are generally suffering from slow response and relatively large drift. The commonly used membranes are also sensitive to handling and prone to bio-fouling. The permeability of the membrane seriously decreases with pressure and temperature also affects its properties. The consequence is that membrane oxygen sensors display a significant hysteresis between down- casts and upcasts. In order to obtain calibration points for the measured oxygen profiles oceanographers have to take bottle samples for every CTD-cast and analyze these with standard laboratory methods on board the research vessel. The development of a microelectrode oxygen sensor ad- dresses the problems of existing DO-sensors. By using a microelectrode as the sensing element an inherently fast re- sponse and operation without a membrane can be achieved. This mode of operation avoids the problems that membranes introduce to oxygen sensors, namely drift with pressure (and therefore hysteresis), the thermal lag of the enclosed working electrolyte and the change in permeability of a membrane due to bio-fouling. Long-term stability of the sensor is achieved by the introduction of 'cleaning pulses' that also act as pre- conditioning for the microelectrode. A further advantage of the presented sensors is the simple way in which they are produced, First tests in the laboratory and in the field show promising results." @default.
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• W2187255085 date "2005-01-01" @default.
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• W2187255085 title "Development and first results of microelectrode DO-sensor a new fast response" @default.
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