In order to meet the requirement of high precision for sea water temperature measurement in marine environment detection

a high precision temperature sensor

which uses Pt resistor with wire structure as temperature sensitive element is designed. By building high-precision constant current source to drive the temperature sensitive unit

a high stable and low-temperature drift differential sampling circuit is designed

and a series of methods

such as low-noise analog-to-digital converter to suppress component drift and digital compensation correction

are used to comprehensively improve the measurement precision. The experimental results show that the designed temperature sensor has high precision and stable performance

and the relative error between the output and the standard value is less than 0. 02 ℃

which can meet the requirements of high precision seawater temperature measurement.