The simulation of the local seeing in segments active alignment

Details The simulation of the local seeing in segments active alignment The simulation of the local seeing in segments active alignment

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spie.8336e..17y&link_type=abstract

Integrated Modeling of Complex Optomechanical Systems. Edited by Andersen, Torben; Enmark, Anita. Proceedings of the SPIE, Volu

Computer Science

Performance

Scientific paper

For a ring segmented telescope and some others dilute aperture segmented telescope, active alignment is essential for closing the control loop. We choose an internal optical metrology to sense the tip and tilt of each segment for the active alignment. The local seeing is an important factor for the performance of this sensing. The effect of temperature gradient and turbulence near ground on the accuracy and frequency of the tip and tilt sensing is modeled. We draw the conclusions as following: 1) It's of importance to take into account the effect of local seeing on the internal optical metrology of active alignment. The magnitude of this effect depends on the heat flux from the heat sources around the telescope. 2) The effect of temperature gradient is a symmetric error, which can induce low order aberration on the primary mirror at a low temporal frequency. It can be compensated, if the temperature gradient is measured exactly. 3) The effect of turbulence is a random error. Increasing the integral time could efficiently decrease the error, but bring down the frequency of active alignment. Ultimately, we believe that a careful enclosure design and thermal control are quit essential for a accurate and fast active alignment.

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