Design of absolute 1.5D grating scale

The grating scale is a high-precision displacement measurement sensor based on the principle of grating optics. Among them, the 1.5D grating scale, as a special type, traditionally relies on relative measurement methods. In this paper, we introduce an innovative concept of an absolute 1.5D grating scale, whose core lies in the addition of labels at both ends of the grating scale. This design utilizing the concept of absolute measurement overcomes the limitations of relative measurement, enabling direct reading of position information without a reference point, thus significantly enhancing overall performance.The grating scale features a large detection range, high precision, and fast response, making it widely used in various fields such as machinery manufacturing, electronic equipment manufacturing, scientific research, and aerospace.