Patent ID: 6844558

Claim:
A position measuring device, comprising a material measure including a carrier substrate extending along a defined measuring direction and having a surface including at least one track having first porous subsections and second subsections, the first porous subsections and the second subsections alternatingly arranged and have different optical properties, the first porous subsections generating a photoluminescence wavelength λ 2 , and the second subsections being non-photoluminescent; and a scanning unit movable relative to the material measure along said measuring direction and including at least one opto-electronic detector element via which scanning signals which are modulated as a function of relative movement between said material measure and said scanning unit are detected and a light source configured to apply radiation of a defined wavelength λ 1 to the material measure, the radiation from the light source configured to excite the photoluminescence in the first subsections of the material measure.