Patent ID: 9551726
Date: 2017-01-24
CPC Classifications: G01B,G01H,G01P

Claim:
1. A device for the interferometric measuring of an object ( 10 ), comprising a radiation source ( 1 ) that generates a source beam ( 3 ), a beam splitting device ( 2 ) that splits the source beam ( 3 ) into a measuring beam and a reference beam ( 4 , 5 ), an optic interference device, a first detector ( 6 ) and at least one second detector ( 13 ), with the interference device and the first detector ( 6 ) embodied cooperating such that the measuring beam ( 4 ), at least partially reflected by the object, is at least partially interfered as a receiver beam ( 4 b ) and the reference beam ( 5 ) on at least one detector area of the first detector ( 6 ), the beam splitter device is embodied to split the source beam ( 3 ) into a measuring beam ( 4 ), a first partial reference beam ( 5 . 1 ), and at least one second partial reference beam ( 5 . 2 ) and for splitting the receiver beam ( 4 b ) into a first partial receiver beam ( 4 . 1 b ) and at least a second partial receiver beam ( 4 . 2 b ), the first receiver beam ( 4 b ) is interfered with the first partial reference beam ( 5 . 1 ) on the detector area of the first detector ( 6 ) and the second partial receiver beam ( 4 . 2 b ) with the second partial reference beam ( 5 . 2 ) is interfered on a detector area of the second detector ( 13 ), here respectively forming an optic interference, an assessment unit to evaluate measuring signals of the first and the second detector ( 6 , 13 ), which is embodied to evaluate the measuring signals of the two detectors according to principles of reception diversity in which the light signals of the two detectors are separated by at least one of separation with regard to polarization, spatial separation, or a modal split, a signal processing unit embodied to generate a combined output signal from the measuring data of the first and the second detector by a weighed addition of the measuring signals of the first and the second detector, wherein the measurement signals from the first and second detector are each demodulated, the measurement signals from the first and second detector are each subjected to a power measurement, and an assessment of the measuring signals of the two detectors (