A displacement measuring system consists of sensors and a scale and is used for measuring a distance to a measuring object. We distinguish between absolute and incremental displacement measurement. With an absolute measuring system, the position value is available immediately after switching on. With an incremental measuring system, a reference point must first be approached after switching on in order to obtain the zero position. This is the case, for example, with optical systems such as the glass scale / optical scale, with stainless steel grid.
Optical length measurement - With stainless steel grid
1)Incremental
2) Absolute
Operating principle
The GIVI MISURE glass scales are optical displacement measuring systems and consist of a very finely divided scale made of steel or ground glass.
The advantage of glass and glass ceramic is the very low thermal expansion, so that temperature fluctuations have practically no influence on the measuring accuracy.
Steel is characterized by a low resistance to contamination and can also be used at extreme temperatures.