The incremental displacement sensors are based on a magnetic principle: consisting of a magnetic scale and a multi-slot reading head that responds to changes in magnetic flux, they detect linear movements with high precision and resolution.
The scale of ferromagnetic alloy or magnetic tape is magnetized by an alternating magnetic field with a pole spacing of 0.2 mm. A special recording head and a laser measurement system guarantee that the graduations are very precise. From
the magnetic pattern on the scale, the multi-slot reading head generates a signal proportional to the movement.
The analog signal generated by the reading head is electronically divided and digitized. Changes in length can be measured with a resolution of from 1 μm down to 0.1 μm.
Thanks to its slim shape with a diameter of 8 mm and its high accuracy over the full range of measurements, model 8738 DK is particularly suitable for use in multi-point measuring equipment. The spindle and spindle guide are protected from dust by a bellow.
