电子测量与仪器学报

李佰明,袁杰,王坤东,雷华明.振荡电路式 LVDT 测量系统设计[J].电子测量与仪器学报,2023,37(2):83-89

振荡电路式 LVDT 测量系统设计

Design of LVDT measurement system based on oscillator circuit

DOI：

英文关键词:linear variable differential transformer LC oscillation circuit displacement measurement inductive sensor

基金项目:国家重点研发计划(2021YFB3203100)资助项目

作者	单位
李佰明	1.上海交通大学电子信息与电气工程学院
袁杰	1.上海交通大学电子信息与电气工程学院
王坤东	1.上海交通大学电子信息与电气工程学院
雷华明	1.上海交通大学电子信息与电气工程学院

Author	Institution
Li Baiming	1.School of Electronics Information and Electrical Engineering, Shanghai Jiao Tong University
Yuan Jie	1.School of Electronics Information and Electrical Engineering, Shanghai Jiao Tong University
Wang Kundong	1.School of Electronics Information and Electrical Engineering, Shanghai Jiao Tong University
Lei Huaming	1.School of Electronics Information and Electrical Engineering, Shanghai Jiao Tong University

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中文摘要:

针对传统 LVDT 测量电路中高成本模块较多且性能不足的问题,提出并设计了一种基于振荡电路的 LVDT 测量系统。测量系统将 LVDT 线圈作为谐振电感接入高性能 LC 振荡器,利用其谐振信号的频移获得待测位移,借助谐振器数学模型及理论分析改善测量系统线性度。样机实验结果显示,在满位移状态下频率范围可达到 73 ~ 122 kHz,采样速率和分辨率可根据实际需求进行调整,其最高分辨率可达到 16. 7 bits,实现亚微米级测量,此时采样速率为 200 Sps,非线性误差为 0. 14%FS。与传统电桥方法相比,该测量系统综合性能更优,且无需低失真激励及高精度解调模块,在电路成本和尺寸方面具有显著优势。

英文摘要:

Focusing on the problem that traditional LVDT measurement circuit requires many high-cost modules and that the performance is relatively low, a LVDT measurement system based on oscillation circuit is proposed and designed. LVDT coil is connected to a highperformance LC oscillator as a resonant inductance. Displacement is obtained by using the frequency shift of the resonance signal. System linearity is improved with the help of the resonator mathematical model and theoretical analysis. The experimental results of the prototype show that under the full displacement state, the frequency range span can reach 73 ~ 122 kHz. The sampling rate and resolution can be adjusted according to the actual needs. A submicronic measuring resolution of 16. 7 bits is achieved when the sampling rate is 200 Sps and the nonlinearity error is 0. 14% FS. The measurement system outperforms the traditional bridge circuit in most aspects, and does not need low distortion excitation and high-precision demodulation module. Besides, it has significant advantages in circuit cost and size.

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