PATENT CLAIM ANALYSIS

Application Number: 15775973
Application Type: Utility
Filing Date: 2018-05
Publication Date: 2018-11
Patent Classification: ["356", "477000"]

Abstract:
An interferometer for areally measuring an optically smooth surface is presented, including means for illuminating a surface region with a plurality of discrete object waves from different directions and comprising means which, on a detector, superimpose object waves reflected at the surface onto a reference wave that is coherent with a plurality of object waves in order to form an interferogram. The interferometer is distinguished by virtue of it being configured to illuminate the surface with a plurality of object waves at the same time and produce the reference wave by way of a Fizeau beam splitter plate or a Fizeau objective, and by virtue of the interferometer including an interferometer stop that is arranged in the beam path upstream of the detector, and imaging optics, wherein the interferometer stop is situated within, or slightly outside of, the Fourier plane of the imaging optics and said interferometer stop filters the object waves reflected by the surface.

Claim (Index 17):
Method for areally measuring an optically smooth surface, in which a surface region, to be measured, of the surface is illuminated with a plurality of object waves from different directions, and the object waves reflected at the surface are superimposed, on a detector, onto a reference wave that is coherent with a plurality of object waves in order to form an interferogram in which dimensions of the surface are imaged, the surface being illuminated with a plurality of object waves at the same time, and the reference wave being produced by way of a Fizeau beam splitter plate or a Fizeau objective, and thus by means of beam splitting from one of the object waves that illuminate the surface, and the object waves reflected by the surface being filtered by an interferometer stop that is arranged within the beam path upstream of the detector, and that is situated within, or slightly outside of, the Fourier plane of imaging optics, characterized in that the object waves are produced by means of a rigid, grid-like arrangement of switchable point light sources, and the optically smooth surface is illuminated, during the measurement thereof, with different samples of mutually differing object waves, each sample producing its own reference wave that is deactivated when illumination with a different sample occurs, and, for each measured value recording, the reference wave that reaches the detector and interferes there with the object waves originating from exactly one point light source and completely illuminating the detector.

Metadata:
- Claim Count in Document: 44.0
- Percentile: 93.0
- Lexical Diversity: 2.10127
- Patent Class: 356.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['12856723', '10838694', '11800840', '15385143', '11354534']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7058813702639444
- 35 USC 102 Novelty (BERT): 0.4964064172499709
- Combined Prediction Score: 0.684933874962547
- Mean Citation Score: 246.20876200000004
- Max Citation Score: 264.7556
- Similarity Product: 233.15763031878475

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 0
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test