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Advances in Sea Surface Layer Temperature Measurements with Fast Responding Thermistor Arrays on Drifting Buoys


Affiliations
1 National Institute of Ocean Technology, Ministry of Earth Sciences, Government of India, NIOT Campus, Chennai - 600 100, India
2 Vels University, School of Engineering, Electronics and Communication Engineering Department, Pallavaram, Chennai - 600 117, India
 

A precise and accurate ocean temperature measurement system is essential for better understanding and knowledge of the spatial and temporal variability of thermal stratification of the upper-ocean layers is fundamental. The National Institute of Ocean Technology, Chennai has indigenously developed a novel negative temperature coefficient (NTC) thermistor based sensor array with RS232 digital output for drifting buoy (Pradyu) (DB) wherein, it is mainly used in ocean observation applications. The DB is built with Indian satellite (INSAT) for real time data telemetry.

The NTC sensing element is used in developing the temperature sensor for the measurement of sea surface layer temperature. The Steinhart–Hart equation and coefficients are applied on each sampling to zero down the error components involved in temperature measurements which corresponds to the nonlinear functionality of the NTC element. In-house developed SST sensor and sensor array are calibrated and extensively tested in laboratory conditions. The results of the SST and sensor array laboratory calibrations and field validations are briefly presented here with significant data sets collected in the Bay of Bengal warm pool regions.


Keywords

Drifting Buoy, NTC Thermistor Sensor, Sensor Array, Steinhart–Hart Coefficients.
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  • Advances in Sea Surface Layer Temperature Measurements with Fast Responding Thermistor Arrays on Drifting Buoys

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Authors

R. Srinivasan
National Institute of Ocean Technology, Ministry of Earth Sciences, Government of India, NIOT Campus, Chennai - 600 100, India
V. Rajendran
Vels University, School of Engineering, Electronics and Communication Engineering Department, Pallavaram, Chennai - 600 117, India
Shijo Zacharia
National Institute of Ocean Technology, Ministry of Earth Sciences, Government of India, NIOT Campus, Chennai - 600 100, India
Tata Sudhakar
National Institute of Ocean Technology, Ministry of Earth Sciences, Government of India, NIOT Campus, Chennai - 600 100, India

Abstract


A precise and accurate ocean temperature measurement system is essential for better understanding and knowledge of the spatial and temporal variability of thermal stratification of the upper-ocean layers is fundamental. The National Institute of Ocean Technology, Chennai has indigenously developed a novel negative temperature coefficient (NTC) thermistor based sensor array with RS232 digital output for drifting buoy (Pradyu) (DB) wherein, it is mainly used in ocean observation applications. The DB is built with Indian satellite (INSAT) for real time data telemetry.

The NTC sensing element is used in developing the temperature sensor for the measurement of sea surface layer temperature. The Steinhart–Hart equation and coefficients are applied on each sampling to zero down the error components involved in temperature measurements which corresponds to the nonlinear functionality of the NTC element. In-house developed SST sensor and sensor array are calibrated and extensively tested in laboratory conditions. The results of the SST and sensor array laboratory calibrations and field validations are briefly presented here with significant data sets collected in the Bay of Bengal warm pool regions.


Keywords


Drifting Buoy, NTC Thermistor Sensor, Sensor Array, Steinhart–Hart Coefficients.

References





DOI: https://doi.org/10.18520/cs%2Fv115%2Fi2%2F325-330