Design of High-precision and Fast-response Temperature Measurement System for Ocean

Aimed at the requirement of fast-response high-precision temperature of ocean expendable probe,this paper presented a new design scheme of temperature sensor.The special encapsulation of high-sensitivity NTC(negative temperature coefficient) thermistor completed temperature sensor.The MSP430 microcontroller and 24-bit AD7799 realized system digitization.The multi-points calibration and interpolation method to nonlinear sensor realized high-accurate temperature measurement.The experiments in the laboratory and South China Sea show that the system possesses stable operation and high reliability.The experiment results show that the measurement response time is less than 100 ms,the measurement resolution exceeds 0.001 ℃ and the measurement accuracy is 0.02 ℃.