Abstract
ABSTRACTWe describe the Starfire Optical Range (SOR) Atmospheric Monitor (SAM). SAM is a 40 cm telescope feeding a Shack-Hartmann wave-front sensor with 20 subapertures across the telescope aperture, which in turn feeds a 1 kHz CCD camera. The unique features of SAM include the ability to work through both day and night and the ability to estimate r0 values down to 1.5 cm at 750 nm. Because SAM can measure 200 tilts simultaneously in 1 ms, it is able to detect rapid changes in turbulence parameters. It will be able to estimate the Fried parameter r0, the Greenwood parameter fg, scintillation, and a rough profile simultaneously. After describing the basic design and construction of SAM and our algorithm for estimating r0, we describe the initial capabilities of the system. We show some initial data regarding the diurnal variation of r0 at the SOR, simulations of SAM’s performance, and a validation against another system. We conclude with future plans for the system.
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