Are the magnetic scales used by absolute and incremental read heads the same

Although the magnetic scales used by absolute read heads and incremental read heads are both position measurement sensors, there are clear differences in their principles and functions. Their magnetic scales are not exactly the same. Let us explore the differences between the two below.

An absolute read head is a position sensor typically used for measuring linear position. It reads position information by monitoring an absolute code strip. An absolute read head can determine the exact position accurately without re-zeroing the starting point. This type of read head is useful for applications requiring high-precision position control, such as CNC machines and industrial robots.

The magnetic scale used for incremental measurement is another type of position sensor and differs from an absolute read head in several ways. Incremental magnetic scales determine position by measuring relative displacement rather than by directly reading an absolute position value. The sensor usually calculates relative displacement based on the number of signal pulses detected, which is an offset relative to an initial or previous position. Therefore, incremental magnetic scale systems generally require a zero calibration during system initialization to ensure measurement accuracy.

Both absolute read heads and incremental magnetic scales are used for position measurement, but their working principles and application scenarios differ. Absolute read heads are suitable for cases that require precise absolute position information, while incremental magnetic scales are more suitable for measuring relative displacement and changes. Choose the appropriate sensor based on the specific application requirements and precision needs.