Patent ID: 8736815

Claim:
A position sensor configured to measure a position data of a target, the position sensor comprising: a radiation source configured to provide a radiation beam, the radiation beam having a propagation direction; a first grating configured to diffract the radiation beam into at least a first diffraction beam having a propagation direction component in a first diffraction direction that is substantially perpendicular to the propagation direction; a second grating, arranged in an optical path of the first diffraction beam, the second grating being configured to diffract the first diffraction beam diffracted at the first grating into at least a second diffraction beam having a propagation direction component in a second diffraction direction substantially perpendicular to the first diffraction direction and to the propagation direction, the second grating being connected to the target; a first detector configured to detect at least a part of the first diffraction beam diffracted by the first grating; and a second detector configured to detect at least part of the second diffraction beam diffracted by the first grating and the second grating.