Multi-spectral piston sensor for co-phasing giant segmented mirrors and multi-aperture interferometric arrays
Abstract
This paper presents the optical design of a multi-spectral piston sensor suitable for co-phasing giant segmented mirrors equipping the future extremely large telescopes (ELTs). The general theory of the sensor is described in detail and numerical simulations have been carried out, demonstrating that direct piston and tip-tilt measurements are feasible within accuracies close to 20 nm and 10 nrad, respectively. Those values are compatible with the co-phasing requirements, although the method seems to be perturbed by uncorrected atmospheric seeing.
- Publication:
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Journal of Optics A: Pure and Applied Optics
- Pub Date:
- December 2009
- DOI:
- 10.1088/1464-4258/11/12/125503
- arXiv:
- arXiv:0908.4040
- Bibcode:
- 2009JOptA..11l5503H
- Keywords:
-
- Physics - Optics;
- Astrophysics - Instrumentation and Methods for Astrophysics
- E-Print:
- Journal of Optics A: Pure Applied Optics vol. 11, 125503 (2009)