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本文介绍了氢离子敏场效应晶体管的温度特性,分析了敏感膜-溶液间的界面电势差及其温度系数,并采用线性近似法提出了反映溶液pH 值与输出电压、温度和器件常数之间关系的表达式。介绍了一种可以测量pH 值与温度的微机温度补偿系统。采用温度特性已知的标准缓冲液标定常数后,就可对待测液进行测量。标定与测量均可自动进行。研究表明该系统可以在pH 值很宽的范围进行补偿。在pH4.00、6.86与9.20标准缓冲液中,温度由5℃变至45℃过程中,温度造成的误差仅为未补偿时的1/40,相当于0.001PH/℃。
In this paper, the temperature characteristics of hydrogen ion sensitive field effect transistors are introduced. The interfacial potential difference and temperature coefficient between the sensitive membrane and the solution are analyzed. The relationship between the solution pH and the output voltage, temperature and device constants Expression. A microcomputer temperature compensation system which can measure pH value and temperature is introduced. After calibrating the constant with a standard buffer of known temperature characteristics, the measured solution can be measured. Calibration and measurement can be carried out automatically. Research shows that the system can compensate for a wide range of pH values. In pH4.00, 6.86 and 9.20 standard buffer, temperature change from 5 ℃ to 45 ℃, the temperature error caused by only 1/40 of the time without compensation, equivalent to 0.001PH / ℃.