摘要
智能电导率仪采用交流测量法来测量电导率。正弦激励的产生是通过阻抗测试芯片AD5933来实现的。AD5933输出的正弦激励加在电导池的电极上,AD5933可以计算出溶液阻抗经过傅里叶变换后阻抗的实部R和虚部I(结果保存在AD5933的寄存器中),然后再计算出校准系数A,就可以通过单片机计算出溶液的真实阻抗,进而计算出溶液的电导率。温度补偿电路测量溶液温度,用于修正温度对测量带来的影响。
Intelligence conductivity meter used AC measurement method measure the conductivity.Using a sine wave as a power incentives.Sinusoidal excitation is generated by impedance test chip AD5933. AD5933 output sinusoidal excitation applied to the electrode conductivity celI,AD5933 impedance solution can be calculated impedance real part R and an imaginary part / after Fourier transform （results stored in the AD5933 registers）,and then calculate the calibration coefficients .4 which can be calculated by the microcontroller,then calculate the solution conductivity.The temperature compensation circuit measures temperature in order to refine results.
出处
《电子质量》
2014年第9期39-42,46,共5页
Electronics Quality
关键词
溶液电导率
电极极化
正弦激励
滤波、放大
AD转换
solution conductivity
electrode polarization
sinusoidal excitation
filtered and amplified
AD conversion
