Concept
Aanderaa 4797 pCO2 optode prototype
| URI | http://vocab.nerc.ac.uk/collection/L22/current/TOOL2163/1/ | ||
|---|---|---|---|
| Within Vocab | SeaVoX Device Catalogue | ||
| Alternative Labels | AA optode 4797 | ||
| Definition | A prototype optical sensor for measuring partial pressure of dissolved carbon dioxide (pCO2) in natural waters. A titanium housing includes a sensing foil composed of two fluorescence indicators embedded in an ion-impermeable, hydrophobic, gas permeable polymer layer. One of these indicators responds to the pH change induced by the diffusion of CO2 gas from the surrounding water into the sensing layer. The second indicator acts as a reference with a fluorescence intensity independent of pH. The combined indicators are excited by an amplitude modulated blue light (LED) and the fluorescence light is detected by a photodiode fitted with a filter to exclude light from the excitation light. The lifetime and phase shift of the returning fluorescent signals are used to determine pCO2 concentration. A temperature sensor is included in the titanium housing close to the foil and this allows for temperature compensation by the internal microprocessor. Response time is limited by CO2 diffusion into the foil and is approximately 5 mins in cold water. Sensors are rated to 6000 m depth, have a wide dynamic range (0 - 50000 uatm), and are stable in water for time periods longer than 7 months. Not to be deployed in sulphidic environments as foil is sensitive to hydrogen sulphide. Full description can be found in Atamanchuk et al. (2014). | ||
| Date | 2025-05-09T14:57:47 | ||
| Identifier | SDN:L22::TOOL2163 | ||
| Note | accepted | ||
| Is Version Of | TOOL2163 | ||
| version | 1 | ||
| Broader | L05:351 |
dissolved gas sensors | |
| Related | L35:MAN0007 |
Aanderaa | |
B75:ORG00228 |
Aanderaa Data Instruments AS | ||
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