Patent ID: 9678436
Date: 2017-06-13
CPC Classifications: G02B,G03F

Claim:
1. An irradiation module for a measuring apparatus, the irradiation module being light-conductive, being configured as a cohesive body and comprising: a beam-splitting surface arranged within the irradiation module for splitting an incoming measuring beam into two partial beams; an optical diffraction grating for interaction with a first of the two partial beams; and a reflection surface for reflecting the second partial beam; wherein the irradiation module has a closed surface such that respective beam paths of the partial beams are totally enclosed by the surface of the irradiation module up to where the partial beams are brought together again in the irradiation module, and the irradiation module is configured to cause the first partial beam to be reflected by the optical diffraction grating at least twice, and to cause the second partial beam to be reflected by the reflection surface at least twice before the first and second partial beams are brought together again.