舰用防爆型氧气探测器的温度补偿方法

Shipboard explosion-proof type oxygen detector temperature compensation

常规氧传感器的透氧膜对温度变化比较敏感,受其影响显著线性度较差。针对在高温、高湿、高盐雾腐蚀等船用条件下,防爆区内宽温范围探测的氧气探测器如何满足精度要求的问题,本文论述了采用硬件补偿方式对电化学氧传感器进行温度补偿的方法,使氧探测器能较为精准的测量不同温度下的氧浓度,并在讨论部分提出了软件补偿方式——最小二乘法进行氧传感器温度补偿。通过对该硬件补偿方法进行线形度测试、高低温试验等测试,证明其很容易实现不同温度下的氧气浓度的精确测量;并且通过分析可知,将最小二乘法应用在氧传感器的温度补偿方面具有很高的可行性。

The oxygen permeable membrane of conventional oxygen sensor is significantly affected by temperature,so the conventional oxygen sensor is sensitive to the ambient temperature and easily results to the poor linearity.Furthermore,it is also a big problem for the conventional oxygen sensor used in explosionproof area aboard to meet the requirements of precision under the conditions of high temperature,high humidity and high salt spray corrosion.In this paper,a hardware compensation method is used in the design of electrochemical oxygen sensor for temperature compensation.In addition,the software compensation method,i.e.least-squares method,used for the temperature compensation of oxygen sensor is also discussed.The linearity test and high/low temperature test indicate that it is easy to realize the accurate measurement of oxygen concentration at different temperatures for hardware compensation.And the analysis to leastsquares method show the high feasibility for temperature compensation of oxygen sensor.