CAJ | 학술논문

分析了液体电导率的测量原理，将电导率的测量转化为电压信号的测量，并建立了等效电路模型；利用 MATLAB 对测量电导率电路模型进行了仿真分析，观察不同参数变化对输出电压幅值的影响，得出在理想与非理想电阻情况下输入正弦波激励信号频率变化对测量结果的影响，为提高测量精度，可利用方波信号代替正弦波信号作为激励源；给出了在低功耗应用中，基于 MSP430单片机和 nRF905无线模块组成无线数据传输的电导率变送器的设计。
분석료액체전도솔적측량원리，장전도솔적측량전화위전압신호적측량，병건립료등효전로모형；이용 MATLAB 대측량전도솔전로모형진행료방진분석，관찰불동삼수변화대수출전압폭치적영향，득출재이상여비이상전조정황하수입정현파격려신호빈솔변화대측량결과적영향，위제고측량정도，가이용방파신호대체정현파신호작위격려원；급출료재저공모응용중，기우 MSP430단편궤화 nRF905무선모괴조성무선수거전수적전도솔변송기적설계。
Analyzes measuring principle of liquid conductivity , the measure of conductivity is translated into the measure of voltage signal , also equivalent circuit model is built . Simulation analysis by MATLAB are done for measuring conductivity circuit model , the effects on output voltage amplitude are observed with the changes of different parameters variety , the frequency change of input sine-wave excitation signal will influence on measuring result under ideal and non-ideal resistance . In order to improve measuring precision , square wave signal used as excitation source may replace sine-wave signal . Under the low power application , conductivity transmitter with wireless data transmission function is designed based-on MSP430 and nRF905 wireless module .