投弃式温深测量仪高精度测温电路设计

Design of high-accuracy temperature measurement circuit of an expendable bathythermograph

为提高投弃式温度深度测量仪(XBT)的测温精度,本文利用电桥测温的方法设计了高精度测温电路,提出了新的校准方法,并应用软硬件结合设计了可靠的入水检测模块。海试结果表明,该XBT测量的温度剖面与标准CTD剖面曲线相似度在0.9以上,测温平均误差小于0.2℃,在允许误差范围内,测温精度达到预期目标。

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.