摘要
基于温度补偿的原理,对引起电阻探针腐蚀监测数据波动的关键因素进行了大量研究和分析,发现异种金属间的接触电势和温差电势差,是造成测量数据温度漂移的主要原因.文中通过特殊的电路设计,采用交变激励源对温漂效应进行补偿,极大降低了电阻探针内部接触电势产生的温差效应,使腐蚀速率的测量精度显著提高.现场和实验室测量表明:其电阻分辨率可达到0.5μΩ,腐蚀速率灵敏度达到了0.1μm/a.
This paper studies and analyses the key factors which induce fluctuation of corrosion data measured by electrical resistance probe based on principle of temperature compensation, and it was found that the main factos are contact potential between different metals and differential temperature potential due to the temperature drift. The measurement accuracy of the corrosion rates is improved greatly according to the compensation of temperature drift through a specially designed AC drive circuit ,which eliminates the temperature difference caused by contact potential within electrical resistance probe. It is verified by field and lab test that the resistance resolution is 0. 5 μΩ and the measurement sensitivity of the corrosion rate is 0. 1 μm/a.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2007年第5期338-341,共4页
Corrosion Science and Protection Technology
关键词
电阻探针
接触电势
温差电势
温度补偿
交变激励电路
electrical resistance probe
contact potential
differential temperature potential
temperature compensation
AC drive circuit
