Optical Metrology of Adaptive Membrane Mirrors

Abstract

Current space-based imaging platforms are significantly constrained in both size and weight by the launch vehicle. Increased payload size and weight increases the cost and decreases the selection of launch vehicles. The challenge of membrane optics in space is implementing adaptive optics technology via a membrane surface that provides at least rough order of magnitude imaging—enabling a large lightweight imaging system where small can be eliminated by processes such as real time holography.

A system was developed which categorizes surface properties of optical quality membrane material with the ability to interpret membrane mirror deformation. Membrane mirrors with adaptive control were constructed and analyzed using this system which provided sub-micron deformation data with associated optical aberrations, proving the ability of PVDF film to provide adaptive control to regions of interest on membrane mirrors. Remaining technical challenges include bonding methods and eventual multi-layer laminate bonding of the PVDF control surfaces to the membrane.

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References

1. Bin-Nun, E. and F. Dothan-Deutsch . 1973. “Mirror with Adjustable Radius of Curvature,” The Review of Scientific Instruments, 44(4): 512-513.

2. Carreras, R. A. et al. 1999. “Tunable Membrane Mirrors Used with Real Time Holography.” Research Briefing.

3. Cassapakis, C. G. et al. 1998. “Inflatable Space Antennas—A Brief Overview,” 1998 IEEE Aerospace Conference Proceedings, New York: IEEE Press, 453-459.

4. Department of the Air Force . 1995. New World Vistas: Air and Space Power for the 21st Century. Technical Report. Washington: USAF Scientific Advisory Board.

5. Freeland, R. E. et al. 1998. Inflatable Deployable Space Structures Technology Summary. Technical Report, 49th International Astronautical Federation Congress: Melbourne, Australia IAF-98-1.5.01, International Astronautical Federation.

6. Gruneisen, M. T. et al. 1999. “Correction of Large Dynamic Aberrations by Real-Time Holography Using Electro-Optical Devices and Nonlinear Optical Media,” Proceedings of SPIE—The International Society for Optical Engineering, High-Resolution Wavefront Control: Methods, Devices, and Applications, July, 3760: 207-212.

7. Rotge, J. R. et al. 1999. “Large Optically Flat Membrane Mirrors,” Proceedings of SPIE—The International Society for Optical Engineering, High-Resolution Wavefront Control: Methods, Devices, and Applications, July, 3760: 207-212.

8. Malacara, D. 1978. Optical Shop Testing. John Wiley & Sons.

9. Marker, D. K. et al. 1999. “Minimum Strain Requirements of Optical Membranes,” Proceedings of SPIE—The International Society for Optical Engineering, High-Resolution Wavefront Control: Methods, Devices, and Applications, July, 3760: 224-231.

10.

10. Sato, T. et al. 1980. “Adaptive PVDF Piezoelectric Deformable Mirror System,” Applied Optics, 19(9).

11.

11. Steinhaus, E. and Lipson, S. G. 1979. “Bimorph Piezoelectric Flexible Mirror,” Journal of the Optical Society of America, 69(3): 478-481.

12.

12. UBE Specialty Materials On Line Catalogs: Upilex-S. 2000. On-Line Product Information. UBE Corporation, http://www.orbital-e.co.jp/ube-labo/upilex-s.html.