Lunar scintillometer to validate GLAO turbulence distribution measurements

Kevin Newman; Michael Hart; Eduardo Bendek; Edison Bustos

doi:10.1117/12.927127

13 September 2012 Lunar scintillometer to validate GLAO turbulence distribution measurements

Kevin Newman, Michael Hart, Eduardo Bendek, Edison Bustos

Proceedings Volume 8447, Adaptive Optics Systems III; 84471A (2012) https://doi.org/10.1117/12.927127
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

A lunar scintillometer, LuSci, is an inexpensive and robust instrument which deploys a linear array of photodiodes pointed toward the moon to measure scintillation produced by atmospheric turbulence. Covariances between the signals from the photodiodes are analyzed to derive estimates of the turbulence profile within a few hundred meters above the ground. Instrument parameters and phase of the moon are taken into account. This method has been used for site testing and monitoring. We present the development of a new LuSci instrument used to validate the ground-layer turbulence distribution measured from the laser wavefront sensor signals of the Ground Layer Adaptive Optics system at the MMT. The near-simultaneous measurements are used to characterize the performance of the GLAO system. We describe the instrument, its operation, approaches to data reduction, and use in performance characterization of a GLAO system.

Citation Download Citation

Kevin Newman, Michael Hart, Eduardo Bendek, and Edison Bustos "Lunar scintillometer to validate GLAO turbulence distribution measurements", Proc. SPIE 8447, Adaptive Optics Systems III, 84471A (13 September 2012); https://doi.org/10.1117/12.927127

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