Metrology system for the Terrestrial Planet Finder Coronagraph

Details Metrology system for the Terrestrial Planet Finder Coronagraph Metrology system for the Terrestrial Planet Finder Coronagraph

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5528...22s&link_type=abstract

Space Systems Engineering and Optical Alignment Mechanisms. Edited by Peterson, Lee D.; Guyer, Robert C. Proceedings of the

Physics

Scientific paper

The Terrestrial Planet Finder (TPF) employs an aggressive coronagraph designed to obtain better than 1e-10 contrast inside the third Airy ring. Minute changes in low-order aberration content scatter significant light at this position. One implication is the requirement to control low-order aberrations induced by motion of the secondary mirror relative to the primary mirror; sub-nanometer relative positional stability is required. We propose a 6-beam laser truss to monitor the relative positions of the two mirrors. The truss is based on laser metrology developed for the Space Interferometry Mission.

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