Department of Electrical Engineering, 100 Inha-ro, Michuhol-gu, Inha University, Incheon 22212, Korea.
Sensors (Basel). 2019 Oct 4;19(19):4310. doi: 10.3390/s19194310.
In this study, a new submersion detection sensor with improved reliability and stability is proposed. The new sensor uses two Resistance Temperature Detectors (RTDs) and operates on the thermal equilibrium principle. The submersion detection sensor controls two RTDs that maintain a constant temperature difference between them in the surrounding environment. The first RTD is used as a reference sensor to measure ambient temperature and the second RTD is supplied with higher current than the reference sensor for self-heating. When submerged, because the thermal conductivity and convective heat transfer coefficient of water are higher than that of air, the temperature difference between the two RTDs is lower in water than in air based on the thermal equilibrium principle. Under these conditions, a submersion detector with a signal conditioning circuit detects these temperature differences. The static performance of the proposed sensor was evaluated by checking whether malfunctions occurred at varying ambient temperatures, differing humidities, and when there was rainfall. In addition, the dynamic performance was evaluated using the response time at varying ambient air temperatures before submersion and with changing water temperatures after submersion, as a metric. The proposed submersion detection sensor is expected to find useful application in aircrafts, ships, and various other industrial fields.
本研究提出了一种新的浸水检测传感器，具有更高的可靠性和稳定性。该新型传感器使用两个电阻温度探测器（RTD），并基于热平衡原理运行。浸水检测传感器控制两个 RTD，在周围环境中保持它们之间恒定的温差。第一 RTD 用作参考传感器，测量环境温度，而第二 RTD 则比参考传感器供应更高的电流以进行自加热。当浸入水中时，由于水的导热性和对流换热系数高于空气，因此根据热平衡原理，两个 RTD 之间的温差在水中比在空气中低。在这些条件下，带有信号调理电路的浸水探测器会检测到这些温差。通过检查在不同的环境温度、不同的湿度以及有降雨时是否发生故障，评估了所提出传感器的静态性能。此外，还通过在浸水前测量不同环境空气温度下的响应时间以及在浸水后测量不同水温下的响应时间来评估动态性能。所提出的浸水检测传感器有望在飞机、船舶和各种其他工业领域得到应用。
