Working Principle of Absolute Magnetic Grating Rulers

Absolute magnetic grating rulers are precision instruments widely used in machining and CNC applications. They measure position with high stability and accuracy by sensing changes in magnetic fields. The working principle is described below.

First, an absolute magnetic grating ruler consists of a read head and a scale. The scale typically contains magnetic markers arranged in a specific pattern, and the read head senses magnetic field changes. Each marker corresponds to a unique position code.

As the scale moves relative to the read head, the magnetic markers cause detectable changes in the field. The read head converts these signals into electrical signals that are processed to identify position information. Unlike incremental magnetic grating rulers, absolute types can report the current position immediately after power-on without a homing operation, thanks to the unique encoding on the scale that provides a distinct code for each position.

The absolute magnetic grating ruler offers a simple and efficient way to achieve high-precision position measurement, making it valuable in machining and CNC environments. With ongoing technological advancement, its application is expected to expand further.