Patent ID: 9188427
Filing Date: 2015-11-17
Classification: G01B,G01S

Abstract:
1. A projective optical metrology system comprising a first and a second optical units, the first optical unit comprising: an optical input configured to receive a first light signal; a number of optical paths; a separator configured to separate a number of components of the first light signal received by the optical input and to couple each of the separated components to a corresponding optical path; and a light target designed to emit a second light signal and formed by a number of light elements, each light element being optically coupled to a corresponding optical path, so as to be illuminated, in use, by the component of the first light signal coupled to said corresponding optical path; and wherein the second optical unit comprises: a light source designed to generate said first light signal; an optoelectronic sensor designed to receive said second light signal, such that said second light signal forms an image of the light target on said optoelectronic sensor; and an electronic processing unit configured to determine at least one quantity indicative of the mutual arrangement of the light target and the second optical unit, on the basis of said image.