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通过建立LC谐振传感器的互感耦合系统的电路模型,给出了测试端输入阻抗的幅值、实部、虚部及相位与传感器谐振频率的关系,并用MATLAB软件进行了仿真分析。仿真结果表明,当传感器与检测线圈接近发生谐振时,阻抗各分量发生突变。制备了环氧树脂基底的传感器模拟结构,并通过改变传感器与检测线圈之间的距离,测试了传感器的谐振频率。测试结果表明,阻抗相位测得的谐振频率受耦合系数的影响,测试时应调整传感器与检测线圈之间的距离来选择合适的耦合系数,以提高测量的精度,而其他阻抗分量测得的谐振频率基本不受耦合系数的影响。
By setting up the circuit model of LC resonant sensor ’s mutual inductance coupling system, the relationship between the amplitude, real part, imaginary part and phase of the input impedance of the test terminal and the resonant frequency of the sensor is given and simulated by MATLAB software. Simulation results show that when the sensor and the detection coil close to resonance occurs, the impedance component of the mutation. The sensor simulation structure of epoxy resin substrate was prepared and the resonant frequency of the sensor was tested by changing the distance between the sensor and the detection coil. The test results show that the resonant frequency measured by the impedance phase is affected by the coupling coefficient. During the test, the distance between the sensor and the detection coil should be adjusted to select the appropriate coupling coefficient to improve the measurement accuracy, while the other impedance components The resonant frequency is basically unaffected by the coupling coefficient.