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Vol. 186, Issue 3, March 2015, pp. 43-48




Investigation of the Performance of an Inductive Seawater Conductivity Sensor

WU Sheng, LAN Hui, LIANG Jin-Jin, TIAN Yu, DENG Yun, LI Hong-Zhi, LIU Ning

National Ocean Technology Center, No. 60 of Xian Yang road, 300112 Tian Jin, China
Tel.: +86)22-87862059, fax: +86 22-27536536

E-mail: olivier_wu9201@163.com


Received: 19 December 2014 /Accepted: 27 February 2015 /Published: 31 March 2015

Digital Sensors and Sensor Sysstems


Abstract: As one of the factors in marine hydrographic survey, seawater salinity plays an important role in marine scientific research, marine exploitation and military defense. In practical measurement, the salinity is always presented indirectly by seawater conductivity value. Compared with the electrode conductivity sensors, inductive conductivity sensors have an advantage of anti-biofouling, and that is very interested in long term ocean observation device. From the principle point of view, this paper discus the different methods to improve inductive sensor output signal, which is confirmed by the relative experimental results. The basic working system of inductive sensor is described here as well as a calibration in standard seawater. From a wide range of temperature, measurement absolute error and stability are close to those of actual electrode conductivity sensors. Furthermore, in the 1000 meters deep sea experiment, our inductive sensor presents a perfect similarity of conductivity profile like sea- bird sensor, even for some small variations. The performance of our inductive sensor can compete with that of commercially available electrode conductivity sensors.


Keywords: Salinity measurement, Conductivity measurement, Electrode sensor, Inductive sensor, Temperature drift.


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