Publications (8)
A comparison of next-generation turbulence profiling instruments at Paranal
Ryan Griffiths, Lisa Bardou, Timothy Butterley +6
A six-night optical turbulence monitoring campaign has been carried at Cerro Paranal observatory in February and March, 2023 to facilitate the development and characterisation of t…
Adapting CNNs for Fisheye Cameras without Retraining
Ryan Griffiths, Donald G. Dansereau
The majority of image processing approaches assume images are in or can be rectified to a perspective projection. However, in many applications it is beneficial to use non conventi…
Demonstrating 24-hour continuous vertical monitoring of atmospheric optical turbulence
Ryan Griffiths, James Osborn, Ollie Farley +3
We report what is believed to be the first example of fully continuous, 24-hour vertical monitoring of atmospheric optical turbulence. This is achieved using a novel instrument, th…
HARMONI at ELT: line spread functions in a diffraction limited spectrometer
Stephen P. Todd, Ãamonn J. Harvey, Anna MacIver +8
HARMONI is the first light, adaptive optics assisted, near-IR integral field spectrograph for the ELT. It covers a spectral range from 800~nm to 2450~nm with resolving powers from…
NOCaL: Calibration-Free Semi-Supervised Learning of Odometry and Camera Intrinsics
Ryan Griffiths, Jack Naylor, Donald G. Dansereau
There are a multitude of emerging imaging technologies that could benefit robotics. However the need for bespoke models, calibration and low-level processing represents a key barri…
Single-star optical turbulence profiling techniques for the SHIMM and other Shack-Hartmann instruments
Ryan Griffiths, Timothy Butterley, Richard Wilson +1
Atmospheric optical turbulence (OT) monitoring is crucial for site characterisation at astronomical observatories and optical communications ground stations. The Shack-Hartmann Ima…