Inductive Touch Sensor

An inductor develops a magnetic field when a current flows through it.

Inductive touch sensor.

The physics unlike capacitive touch sense which requires only a pcb capacitor and a fingertip inductive touch sense involves two separate components. Non contact operation free from any wear and tear high switching frequencies and accuracy. Then when your finger which comes either in contact or really close the capacitance of the circuit changes and a touch is detected. A pcb inductor and a metal plate.

This paper discusses the technologies of capacitive and inductive sensors and concludes with a key feature comparison. Inductive sensors are nowadays indispensable for industrial applications. Inductive sensing based designs for touch on metal offers a completely sealed and contactless solution with a greatly simplified assembly process. For inductive i ve seen two kinds one that s pen based where there are a bunch of elements putting out a small em.

Comparison between inductive and capacitive proximity sensors. In addition to being insensitive to dirt moisture and other contaminants inductive touch on metal buttons offer a robust solution that does not use moving. In addition they are insensitive to vibration dust and moisture. To start with what s similar let s talk about the internals of inductive and capacitive prox switches.

A key step in selecting a position sensor is understanding the requirements of sensor size resolution repeatability accuracy mounting constraints and environmental ruggedness. Alternatively a current will flow through a circuit containing an inductor when the magnetic field through it changes. While there are clear differences between the two types of sensors there are similarities as well. As compared to mechanical switches they offer almost ideal conditions.

An inductive sensor is a device that uses the principle of electromagnetic induction to detect or measure objects. Inductive touch system design guide for hmi button applications 1 mechanical design implementing an effective inductive touch solution requires appropriate system mechanical design and matching sensor design. The mechanical design should take into consideration the material properties button geometry and sensor construction and mounting. Inductive touch sense as you might have guessed is a technique in which touch events are detected by measuring changes in inductance.

Like inductive sensors capacitive sensor outputs can be no nc or analog.