摘要
植物油掺伪后难以检测,根据不同油品具有不同介电常数的特性,设计了通过电容值进行检测的数字式油品传感器,建立了传感器等效电路,分析了传感器结构对电容检测的影响。传感器为插杆状结构,平板电容极板为敏感元件,检测时不同油品介质引起的电容量变化经AD7745转换成相应的数字量通过I2C串行总线口输出。实验结果表明:数字式油品传感器能够对掺伪3%以上的植物油进行快速有效鉴别,重复性优于0.2%。
It＇ s difficult to detect whether the edible vegetable oil is adulteration. According to the characteristics that one kind of oil＇ s permittivity is different from others, a capacitive sensor is designed for oil quality detection. The equivalent circuit of the sensor is established to analyze the impact of sensor structure on capacitance detection. The sensor is rod-shaped,and the probe of plate capacitor is sensing unit. The AD7745 chip is used to detect the capacitance change due to different oil quality acting as medium. The detecting result of the sensor is displayed digitally,and is output through the I2C serial bus port. Experiment shows that the sensor can distinguish quickly whether the oil contain adulteration or not to above 3 % edible vegetable oil, and its repeatability is prior to 0.2%.
出处
《传感器与微系统》
CSCD
北大核心
2011年第9期95-97,101,共4页
Transducer and Microsystem Technologies
基金
科学技术部科技型中小企业技术创新基金资助项目(08026214302169)
关键词
植物油
掺伪检测
电容传感器
AD7745
edible vegetable oil
adulteration detection
capacitive sensor
AD7745
