Thesis
Optically relayed push-pull velocity interferometry resolved in time and position
Washington State University
Master of Science (MS), Washington State University
2005
Handle:
https://hdl.handle.net/2376/313
Abstract
A novel technique was developed to improve the spatial and velocity accuracy of line-VISAR. Specifically, a four-to-one optical relay was developed using open optics. Besides reducing the complexity, cost and alignment difficulty of true quadrature line-VISAR, the most precise type of line-VISAR, the relay technique provides unprecedented velocity and position resolution. The VISAR equations which produce the velocity record from the interfered phase were rederived around the concept of optical equivalence. This provides a more intuitive and general derivation, which allows for combinations of delay elements of different materials and accounts for individual path attenuations. A method for precisely obtaining optical equivalence by using white-light interference was also developed. A new analysis program was written to complement quadrature push-pull line-VISAR instruments. This software makes use of multi-variable, nonlinear optimization to align the four quadrature images in time and position, under guidance from the user. An important element of the analysis software is a modified two-dimensional phase unwrapping technique. This modification automatically identifies a curve along which a fringe may need to be added. These automations greatly reduce the user effort and improve the accuracy of the analysis.
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Details
- Title
- Optically relayed push-pull velocity interferometry resolved in time and position
- Creators
- Dirk J. Robinson
- Contributors
- J. R. Asay (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Physics and Astronomy, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525169801842
- Language
- English
- Resource Type
- Thesis