Design And Research Of CTD Measurement Circuit System

The CTD measurement technology is one of key ocean technologies , the measurement technology is used to measure the conductivity and temperature in different depth in the sea.It's widely used in marine meteorology,hydrology and military fields.It's of great social and economic meaning to build a reliable high precision CTD measurement circuit system.On the base of analysis on the development status of CTD measurement technology,we designed a kind of CTD measurement circuit system.We finished the hardware circuit design and the function modules debug adopting AVR and MSP430 dual CPU structure combined with AD7791.This paper described the principles of using the thermistor to measure the temperature,using the inductive cell conductivity sensor to measure conductivity and using the pressure senor to measure the depth,finished the calibration work of the sensors.As shown in results, the system is reliability.