Abstract

This paper studies a novel CTD sensor (SZQ1-1) which is developed for underwater glider to meet the requirement of autonomous acquisition of high-quality profile hydrodynamic oceanography data. An independently developed electromagnetic induction type conductivity sensor, a quick response thermistor and a high-precision pressure sensor is used to integrate the CTD sensor. Several designs of compact mechanical structure and low-power control acquisition circuit are developed in the CTD sensor. The SZQ1-1 CTD is calibrated with measuring instrument in the laboratory and fourth-degree polynomial fitting equations are developed to fit the curves. After software-based calibration, the SZQ1-1 is compared with SBE 19plus by sea trial. The SZQ1-1 and SBE 19plus were carried by an underwater glider which dived in Northern South China Sea with a maximum depth of 500.36 m. Because the thermal lag error exists in the original data measured with the CTD sensor in the underwater glider, the measured conductivity and salinity data are revised again in the software. According to sea trial results, the real-time temperature, salinity and depth profile data obtained by SZQ1-1 sensor is consistent with the data measured with SBE 19plus.

摘要

本文研究了一种为水下滑翔机开发的新型CTD传感器（SZQ1-1），以满足自主获取高质量剖面水动力海洋学数据的需求。CTD传感器采用自主研发的电磁感应式电导率传感器、快速响应热敏电阻和高精度压力传感器集成。CTD传感器开发了多种机械结构紧凑和低功耗控制采集电路的设计。SZQ1-1 CTD在实验室用测量仪器校准，并建立了四次多项式拟合方程来拟合曲线。在基于软件的校准之后，SZQ1-1 通过海试与 SBE 19plus 进行比较。SZQ1-1和SBE 19plus由一架水下滑翔机携带，在南海北部最深500.36 m下潜。由于水下滑翔机CTD传感器测得的原始数据存在热滞后误差，因此在软件中对测得的电导率和盐度数据进行了重新修正。根据海试结果，SZQ1-1传感器获得的实时温度、盐度和深度剖面数据与SBE 19plus测得的数据一致。