Bogucki, DarekSnowdon, TomDoerr, JenniferSerafy, Joseph2022-09-072022-09-072022-08-08Bogucki, D.J.; Snowdon, T.; Doerr, J.C.; Serafy, J.E. A Salinity–Temperature Sensor Based on Microwave Resonance Reflection. Sensors 2022, 22, 5915. https:// doi.org/10.3390/s22155915https://hdl.handle.net/1969.6/93954We developed and tested a microwave in situ salinity sensor (MiSSo) to simultaneously measure salinity and temperature within the same water sample over broad ranges of salinity (S) (3–50 psu) and temperature (T) (3–30 ◦C). Modern aquatic S sensors rely on measurements of conductivity (C) between a set of electrodes contained within a small volume of water. To determine water salt content or S, conductivity, or C, measurements must be augmented with concurrent T measurements from the same water volume. In practice, modern S sensors do not sample C and T within the same volume, resulting in the S determination characterized by measurement artifacts. These artifacts render processing vast amounts of available C and T data to derive S time-consuming and generally preclude automated processing. Our MiSSo approach eliminates the need for an additional T sensor, as it permits us to concurrently determine the sample S and T within the same water volume. Laboratory trials demonstrated the MiSSo accuracy of S and T measurements to be <0.1 psu and <0.1◦C, respectively, when using microwave reflections at 11 distinct frequencies. Each measurement took 0.1 µs. Our results demonstrate a new physical method that permits the accurate S and T determination within the same water volume.en-USAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/aquatic salinity measurementsaquatic temperature measurementsenvironmental monitoringArticlehttps:// doi.org/10.3390/s22155915