CAJ | 학술논문

文中介绍了电容式液位传感器的测量原理，提出了一种基于CAV444线性电容－电压转换芯片的电容式液位传感器设计与优化方案。该方案根据所测液位范围对应的电容值变化范围对调理电路的输出电压进行了变换，以提高传感器的灵敏度，并根据被测信号的带宽设计了低通数字滤波器，提高了传感器的抗干扰能力。测试结果表明，该传感器性能稳定，最大非线性误差为0.75％，测量结果线性度好；引用误差为1.13％，测量准确度高，能够满足大多数工业现场实际的液位测量需求。
문중개소료전용식액위전감기적측량원리，제출료일충기우CAV444선성전용－전압전환심편적전용식액위전감기설계여우화방안。해방안근거소측액위범위대응적전용치변화범위대조리전로적수출전압진행료변환，이제고전감기적령민도，병근거피측신호적대관설계료저통수자려파기，제고료전감기적항간우능력。측시결과표명，해전감기성능은정，최대비선성오차위0.75％，측량결과선성도호；인용오차위1.13％，측량준학도고，능구만족대다수공업현장실제적액위측량수구。
The measurement principle of capacitive liquid level sensor was introduced at first .And then,that how to design and optimize such a sensor based on CAV444 was proposed.Finally,a liquid level sensor was fabricated and tested.According to the rang of capacitance ,which corresponds to the measured level , the output voltage of the conditioning circuit was converted to in-crease the sensitivity of the sensor ,and a low-pass digital filter was designed according to the bandwidth of the signal to improve the resistance of the sensor .Finally,the design and testing of the sensor system were completed .The testing results shovo that the max non-linearity error is 0.75%,maximum fiducial error is only 1.13%,and this sensor has good linearity ,high measurement accura-cy,and good stability .Therefore,this sensor meets the requirements of practical liquid level measurement .