A simple method for detecting very small changes in capacitance or inductance

被引：3

作者：

Deguchi, Mikio ^{[1
]}

机构：

[1] Niihama Coll, Natl Inst Technol KOSEN, Dept Elect & Control Engn, 7-1 Yagumocho, Niihama, Ehime 7928580, Japan

来源：

MICROELECTRONICS JOURNAL | 2020年 / 101卷

关键词：

Capacitive sensor; Inductive sensor; Object detection; Proximity sensor; IMAGE-RECONSTRUCTION ALGORITHMS; PROXIMITY SENSOR; TOMOGRAPHY; DESIGN; ELECTRONICS; WIRELESS; LIQUID; SYSTEM;

D O I：

10.1016/j.mejo.2020.104802

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A simple method for detecting very small changes in capacitance or inductance is presented. In the circuit used in the proposed method, which employs LC resonance, the phase of the output signal sharply and monotonically changes by about 180 degrees around the resonance frequency. When the capacitance or inductance changes slightly, the resonance frequency shifts accordingly. This change can be sensitively detected as a phase shift of the output signal by applying a fixed frequency signal to the circuit near the resonance frequency. The circuit used for detection is entirely composed of general-purpose electronic components and does not use special function devices. This method can be applied in various practical contexts, for example, object detection, proximity sensing, monitoring material properties, and electric capacitance tomography.

引用

页数：12

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