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 30 to less than 10 (λ/360) using these methods. Key words: Temporal averaging, compensation, phase stepping, phase drift, holographic interferometry.
Original language | English (US) |
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Pages (from-to) | 147-154 |
Number of pages | 8 |
Journal | Applied Optics |
Volume | 32 |
Issue number | 2 |
DOIs | |
State | Published - Jan 10 1993 |
Externally published | Yes |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Engineering (miscellaneous)
- Electrical and Electronic Engineering