An Adaptive Analog Circuit for LVDT's Nanometer Measurement Without Losing Sensitivity and Range
An Adaptive Analog Circuit for LVDT's Nanometer Measurement Without Losing Sensitivity and Range
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用于 LVDT 纳米测量且不损失灵敏度和范围的自适应模拟电路
DOI：
10.1109/jsen.2014.2364610
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发表时间：
2015-04-01
影响因子：
4.3
通讯作者：
Ding, Han
中科院分区：
文献类型：
--
作者：
Chen, Gang;Zhang, Bo;Ding, Han
为提高线性可变差动Transformer（LVDT）的纳米级测量范围而不损失分辨率，设计了一种自适应电路。该调理电路采用模糊比例积分微分控制的可编程增益放大器阵列产生参考信号，并根据LVDT的磁芯位置进行自调整，保证了模数转换器的信号在满量程工作范围内变化很小。因此，可以在不损失测量范围的情况下提高测量系统的灵敏度。仿真结果表明，该电路较好地解决了微弱信号检测中分辨率与检测范围之间的矛盾。而且，信噪比也得到了很大的改善。此外，基于DSP的信号调理器，它利用自适应电路，证明了新的设计和纳米精度在很宽的范围内获得的性能。
A self-adaptive circuit for the linear variable differential transformer (LVDT) has been developed to enhance its nanometer measurement range without loss resolution. By applying a fuzzy-proportional-integral-derivative controlled programmable gain amplifier array to produce a reference signal, which can adjust itself according to LVDT's core position, the conditioning circuit has ensured the signal to analog-to-digital converter varying in a very small interval over full-scale operating range. Thus, the sensitivity of the measurement system can be improved without losing measurement range. The simulation result demonstrated that the proposed circuit has solved the contradiction between resolution and range, which usually occurs in weak signal detection. Moreover, the signal-to-noise ratio has been ameliorated greatly. Additionally, the DSP-based signal conditioner, which utilizes the self-adaptive circuit, demonstrates the performance of the novel design and nanometer precision is obtained in a wide range.