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Analysis on the Calibrating Methods Based on Surface Temperature and Salinity Sensors
Author(s): 
Pages: 100-105
Year: Issue:  1
Journal: Ocean Technology

Keyword:  temperature and salinity sensorconductance methodcalibrationleast square methodregression equation;
Abstract: The inductive temperature and salinity sensor measures salinity based on the conductance method and has the advantage of real-time field measuring. Seawater temperature, conductance and pressure need to be determined before measuring the salinity. When using the surface inductive temperature and salinity sensor, the pressure value needs not to be taken into account, and the precisions of temperature and conductance directly determine the accuracy of salinity measuring, so calibrating temperature and salinity is necessary before using the sensor. This paper analyzes the operational principle of the sensor and designs the calibrating process, including the regression equation selection and coefficient calculation. The regression equations of temperature, conductance and temperature compensation are in multinomial format, the coefficients are calculated with the least square method using 5 to 7 groups of experiment data from high-precision salimeter and platinum resistance thermometer,and the regression of conductance is calculated with the dichotomy method in which conductance is derived with temperature and salinity. Finally, a series of experiments demonstrate the error range of calibrating regression equation.
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