Towards Chip-Based Salinity Measurements for Small Submersibles and Biologgers.
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Water’s salinity plays an important role in the environment. It can be determined by measuring conductivity, temperature, and depth (CTD). The corresponding sensor systems are commonly large and cumbersome. Here, a 7.5 × 3.5 mm chip, containing microstructured CTD sensor elements, has been developed. On this, 1.5 mm2 gold finger electrodes are used to measure the impedance, and thereby the conductivity of water, in the MHz frequency range. Operation at these frequencies resulted in higher sensitivities than those at sub-MHz frequencies. Up to 14 kΩ per parts per thousand salt concentration was obtained repeatedly for freshwater concentrations. This was three orders of magnitude higher than that obtained for concentrations in and above the brackish range. A platinum electrode is used to determine a set ambient temperature with an accuracy of 0.005∘ C. Membranes with Nichrome strain gauges responded to a pressure change of 1 bar with a change in resistance of up to 0.21 Ω. A linea.....
JournalInternational Journal of Oceanography
Page RangeArticle 529674 [11pp.]
Essential Ocean Variables (EOV)Sea surface salinity
Maturity LevelTRL 4 Component/subsystem validation in laboratory environment
Best Practice TypeGuide
CitationJonsson, J,; Smedfors, K.; Nyholm, L. and Thornell, G. (2013) Towards Chip-Based Salinity Measurements for Small Submersibles and Biologgers. International Journal of Oceanography, 2013, Article 529674 [11pp.] DOI: https://doi.org/10.1155/2013/529674.
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