Abstract
We describe the new atmospheric optical turbulence profiler FASS (Full Aperture Scintillation Sensor). Based on scintillation, the instrument uses a fast and low-noise detector to record and process sequences of scintillation images. Statistical processing of these data is based on the calculation of power spectra of intensity in annular pupil zones over the angular coordinate. The angular power spectra are used to measure the optical turbulence intensity of 14 layers located at logarithmically spaced distances from 0 to 25 km. The reference functions relating turbulence strength to the angular power spectra are computed by numerical simulation. Measurement of the ground-layer turbulence and total seeing with FASS is possible as the detector is optically conjugated below ground (negative distance). Results of measurement campaigns at different observatories are reported, showing a good agreement of turbulence profiles measured by FASS with two other instruments, SCIDAR and MASS.
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