在电气工程学中，电容式感应是基于电容耦合原理的一种技术，可用在多种感应器上，如侦测和测量：距离，位置和位移，湿度，液平面以及加速等。电容感应技术正逐步取代传统的输入设备鼠标，并越来越受欢迎。电容式感应器被用在平板电脑的触摸板，MP3播放器，电脑显示器，手机以及其他设备上。越来越多的工程设计师选择电容式感应器，其优点是用途广泛，可靠且稳健，独特的人机交互界面，且价格较机械式输入设备更低。电容式触摸感应器选择被广泛的使用在手持设备和MP3播放器上。 电容式感应器可以侦测到任何导电或具备介电性能的物体。它可以取代传统的机械按键，其他的一些新技术如多点触控和基于手势的触摸屏也是以电容式感应为前提的。

In electrical engineering, capacitive sensing is a technology, based on capacitive coupling, that can detect and measure anything that is conductive or has a dielectric different from air.

Many types of sensors use capacitive sensing, including sensors to detect and measure proximity, position or displacement, humidity, fluid level, and acceleration. Human interface devices based on capacitive sensing, such as trackpads, can replace the computer mouse. Digital audio players, mobile phones, and tablet computers use capacitive sensing touchscreens as input devices. Capacitive sensors can also replace mechanical buttons.