作者：高峰，施亮
单位：上海交通大学自动化系，上海 200240
中图分类号：TP212.1              
文献标识码：A              
文章编号：1006-883X(2022)02-0024-06
收稿日期：2021-12-28

摘要：传统的机械开关由于机械结构的限制、寿命有限等缺点，已逐渐被触控式开关所代替。常见的触控开关技术有电容式、电感式、电阻式以及光学式等，其中电感式触控开关因其抗干扰性强，能更好地应对金属盖板的结构设计等诸多优势，可应用于更多智能产品交互场景的设计。电涡流式传感器是电感式触控开关的技术核心，因此，该文从电涡流传感器原理出发，采用谐振测量法实现对位移变化量的有效测量，分析了传感器的灵敏度问题。由此提出一种激励信号源频率自校准实现方法，利用这种自校准方法实现对激励信号源频率校准以提高电感式触控传感器的灵敏度。
关键词：触控开关；电感式传感器；灵敏度；频率自校准

Research on Elf-Calibration Method of Excitation Signal Source Frequency of the Inductive Touch Sensor
GAO Feng, SHI Liang
(Department of Automation, Shanghai Jiao Tong University, Shanghai 200240, China)
Abstract: Traditional mechanical switches have been gradually replaced by touch switches due to the limitations of the mechanical structure, limited life and other shortcomings. Common touch switch technologies include capacitive, inductive, resistive and optical, among which inductive touch switches can be applied to the design of more intelligent product interactive scenarios due to their many advantages such as strong anti-interference and better response to the structural design of metal lids. The eddy current sensor is the technical core of the inductive touch switch, so the paper starts from the principle of eddy current sensor, uses the resonance measurement method to realize the effective measurement of displacement change and analyzes the sensitivity of the sensor. The paper proposes a self-calibration method of excitation signal source frequency, and uses this self-calibration method to realize the calibration of excitation signal source frequency to improve the sensitivity of the inductive touch sensor.
Key words: touch switch; inductive sensor; sensitivity; frequency self-calibration

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备注：2022年 第28卷 第02期