【摘要】 本文针对电容称重传感器电容检测电路的输出电压值与载荷质量之间的非线性特性,在测试系统中增加了非线性校正环节,利用多项式拟合法,求取传感器反非线性特性,进行曲线拟合实现非线性校正,并给出逼近多项式系数的最小二乘求解方法。实际应用表明,其测量载荷的精度可以达到要求,非线性校正效果明显,具有良好的应用和推广价值。更多还原

【Abstract】 The capacitance weighing transducer presents a challenge in nonlinearity,i.e.the relationship between the output voltage of the transducer and the loading is nonlinear.To obtain accurate measurement,it is necessary to compensate the nonlinearity.This paper presents a nonlinearity compensation method.By making use of polynomial fitting,the inverse nonlinear characteristics have been found and a fitting curve is given,aiming to compensate the nonlinearity.This paper also presents a least square method of finding polynomial coefficients for nonlinearity com- pensation.It has been shown experimentally that the nonlinearity can be compensated satisfactorily and the desired accuracy has been achieved.The approach suggested in this paper may be used for other applications.更多还原