Abstract:

This paper devises a highaccuracy temperature measurement circuit with a temperature measurement bridge to improve temperature measurement accuracy of an expendable bathythermograph (XBT). A new calibration method is also presented. We further design a reliable water immersion detection module combined with software and hardware. Ocean experiment results indicate that the temperature curve measured by XBT has more than ninety percent similarity degree with standard CTD, less than 0.2 ℃ for average temperature measurement error. This is in the range of allowed error, so temperature measurement accuracy attains expected values.

Key words: expendable bathythermograph, temperature measurement accuracy, water immersion detection