Sliding the MLS sensors along a magnetic scale will produce a sine and a cosine output signal as a function of its position relative to a magnetic pole. In order to deliver satisfying results, this will be achieved as long as the air gap between sensor edge and magnetic scale surface does not exceed approximately half of the pole pitch. As the sensor principle is based on the anisotropic magneto resistance effect, the signal amplitudes are nearly independent on the magnetic field strength and therefore air gap variations do not have a strong effect on the measured accuracy. The sensor detects a magnetic gradient field and is thus almost insensitive to homogenous magnetic stray fields. Precise displacement values will be obtained by using a sine/cosine decoder device. The maximal obtainable precision depends on the accuracy of the magnetic scale and on the distance sensor – magnetic scale. Errors <1% of the pole pitch per meter are commonly achievable. MLS hybrids are available for pole pitches of 1, 2, 2.5 and 5mm.
Sin- / cos-output signals suitable for signal evaluation by standard ASIC’s
Allows very high precision measurements in harsh and dirty environments
High accuracy / low hysteresis
Insensitive to air gap fluctuations
Highly reliable due to contactless measurement principle
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