Abstract
A technique that compensates for low spatial frequency spurious phase changes during an interference experiment is developed; it permits temporal averaging of multiple phase measurements, made before and after object displacement. The method is tested with phase-stepped real-time holographic interferometry applied to cantilever bending of a piezoelectric bimorph ceramic. Results indicate that temporal averaging of the corrected data significantly reduces the white noise in a phase measurement without incurring systematic errors or sacrificing spatial resolution. White noise is reduced from 3° to less than 1° (λ/360) using these methods.
Original language | English (US) |
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Pages (from-to) | 1087-1094 |
Number of pages | 8 |
Journal | Applied Optics |
Volume | 32 |
Issue number | 7 |
DOIs | |
State | Published - Mar 1993 |
Externally published | Yes |
Keywords
- Compensation
- Holographic interferometry
- Phase drift
- Phase stepping
- Temporal averaging
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Engineering (miscellaneous)
- Electrical and Electronic Engineering