Iterative algorithm for three flat test

Area of Science:

• Optical metrology
• Surface characterization
• Precision engineering

Background:

• Classical absolute planarity measurements rely on multiple interferometric tests comparing three reference flats.
• Existing data reduction methods can be complex and time-consuming.

Purpose of the Study:

• To develop and validate a new numerical algorithm for absolute planarity measurements.
• To demonstrate the accuracy and versatility of the iterative approach.

Main Methods:

• A novel iterative data processing algorithm was developed for interferometric planarity analysis.
• The algorithm converges to a solution numerically.

Main Results:

• The iterative algorithm was successfully applied to both synthetic and experimental interferogram data.
• High accuracy and versatility were demonstrated for the new measurement approach.

Conclusions:

• The presented iterative algorithm offers an accurate and versatile alternative for absolute planarity measurements.
• This method simplifies data reduction compared to traditional analytical techniques.