The eddy current linear position sensors utilise a reference coil for producing a magnetic field in a target. This reference coil is also used for monitoring the field in the neighbouring sensing coil to find out the distance from the target. As the target starts getting closer to the sensor, the magnetic field gets disrupted and this disruption is sensed by the other coil.
Eddy current linear position sensors also determine the variations in the magnetic field due to the presence of close conductive objects. Field detection and generation information is offered in the range of kHz to MHz. As these sensors operate by the interruption of the magnetic field, it is possible to have ferrous or nonferrous, magnetic or non-magnetic targets.
How to select the appropriate eddy current linear position sensors
The range that eddy current linear position sensors can measure and its sensing frequency are two of the most important specifications to consider. The sensing frequency is actually the frequency range on which the device operates. Static resolution of the eddy current linear position sensors is also an important consideration.
The smallest rise of the quantity that can be recognised is known as the resolution. The static resolution tells you about the change in quantity that is required for the sensor to determine the change. In order to determine the small changes in position, you will need a sensor with a very small resolution.
Electrical output offered by the eddy current linear position sensors can be computer signals (serial or parallel), digital, analogue voltage, frequency or current. By considering these things, you can easily get the right eddy current linear position sensor to suit your requirements.
