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<p>The change of seawater temperature significantly affects the solubility of gas in it. With the increase of water temperature, the gas in sea water gradually precipitates to form bubbles, which may attach to the surface of the sensitive unit of the conductivity sensor, affecting the accuracy of the measurement results of the sensor. The effect of bubble on the measurement of conductivity sensor is discussed through a series of rising and cooling experiments in sea tank, and the effect is reduced by cooling method or specific debubling operation. The experimental results show that the bubble attachment will cause the measurement value of the conductivity sensor to be lower than the standard value, and the difference will gradually increase with the accumulation of bubbles on the surface of the sensitive unit. The offset of the electromagnetic induction conductivity sensor in the cooling measurement process of this study reached a maximum of −&#xa0;0.0252mS/cm, and the offset in the heating measurement process reached a maximum of −&#xa0;1.0761mS/cm. These offsets seriously affect the accuracy of the measurement data. The error of the electrode type conductivity sensor during the cooling measurement process was controlled within the range of ± 0.005mS/cm, and even during the heating measurement process, the maximum error was only −&#xa0;0.0133mS/cm. In addition, the research shows that the electrode conductivity sensor performs better than the induction conductivity sensor in terms of anti-bubble interference. Therefore, the influence of bubbles on the measurement results of the conductivity sensor should be fully considered when Conductivity Temperature Depth (CTD) profiler measurement is carried out, and the operation of excluding bubbles and cooling measurement should be adopted to ensure the accuracy and reliability of the obtained data.</p>

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Study on the Influence of Bubbles on the Measurement Results of CTD Conductivity Sensor

  • 期刊论文

  • 发表日期：

    2025年7月8日

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  • Qindan Liu,
  • Yue Yin,
  • Mengyang Liu,
  • Aihua Xu,
  • Yuzhen Guo,
  • Lijun Zhang,
  • Hua Zhang,
  • Jiangyong Hu

摘要

The change of seawater temperature significantly affects the solubility of gas in it. With the increase of water temperature, the gas in sea water gradually precipitates to form bubbles, which may attach to the surface of the sensitive unit of the conductivity sensor, affecting the accuracy of the measurement results of the sensor. The effect of bubble on the measurement of conductivity sensor is discussed through a series of rising and cooling experiments in sea tank, and the effect is reduced by cooling method or specific debubling operation. The experimental results show that the bubble attachment will cause the measurement value of the conductivity sensor to be lower than the standard value, and the difference will gradually increase with the accumulation of bubbles on the surface of the sensitive unit. The offset of the electromagnetic induction conductivity sensor in the cooling measurement process of this study reached a maximum of − 0.0252mS/cm, and the offset in the heating measurement process reached a maximum of − 1.0761mS/cm. These offsets seriously affect the accuracy of the measurement data. The error of the electrode type conductivity sensor during the cooling measurement process was controlled within the range of ± 0.005mS/cm, and even during the heating measurement process, the maximum error was only − 0.0133mS/cm. In addition, the research shows that the electrode conductivity sensor performs better than the induction conductivity sensor in terms of anti-bubble interference. Therefore, the influence of bubbles on the measurement results of the conductivity sensor should be fully considered when Conductivity Temperature Depth (CTD) profiler measurement is carried out, and the operation of excluding bubbles and cooling measurement should be adopted to ensure the accuracy and reliability of the obtained data.