Using eddy current sensors to measure linear position

There are many instances in industry when the distance of an object from a target source needs to be measured. And, this can be achieved easily using a suitable position sensor. Eddy current position sensors are one type of sensor that are suitable for use in instances like this, and they especially excel in harsh environments because the magnetic field which is used does not easily become polluted by dirt, grime or any other contaminants.

The reference coil in the sensor generates a magnetic field which in turn induces eddy currents in the target. When the target approaches the sensor, there is a change in the eddy currents induced in the target accordingly. Through conditioning electronics, this change is converted into a linear output DC voltage. There are may different sensor measurement ranges and designs and advice can always be sought from Micro Epsilon engineers before selecting a suitable sensor. It’s also worth considering the resolution of the sensor. If you need to monitor very small changes in displacement of the target you will need a sensor that has a very small resolution. Micro Epsilon specialise in miniature, extreme high resolution sensors.

Most eddy current linear position sensors have a range of different outputs available that can be used for your specific applications. The output can be in digital format, analogue format or even a current or frequency output can be generated by the sensor.