Analyzing the Focus Sensor Images for ODI at WIYN

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The WIYN (Wisconsin, Indiana, Yale, & NOAO) is building the One Degree Imager (ODI) for its 3.5m telescope at Kitt Peak. ODI is a wide field imager that is focusing on delivering the excellent image quality of the WIYN telescope. Maintaining good telescope focus is essential for the success of this instrument. A proposed technique for focusing ODI is using a CCD sensor that is tilted with respect to the instrument’s focal plane. We numerically analyzed images obtained with a prototype focus camera using several methods to determine the location of the best-focused stars. Specifically, a least chi-squares fit was used to fit a second order polynomial to the plot of FWHM versus pixel position along the CCD for the stars taken in these focus sensor images. Once ODI is operational at WIYN, one can use this algorithm to find the best FWHM and its position along the CCD, and feed this information back to the telescope control system. These numerical methods were implemented in the scripting language tcl/tk because of its easily built user interfaces and ready acceptance at Kitt Peak Observatory.
R.P.N.'s research was supported by the NOAO/KPNO Research Experiences for Undergraduates (REU) Program which is funded by the National Science Foundation through Scientific Program Order No. 3 (AST-0243875) of the Cooperative Agreement No. AST-0132798 between the Association of Universities for Research in Astronomy (AURA) and the NSF.

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