Absolute Calibration of a Large-diameter Light Source

Authors :: Brack, J. T.
Cope, R.
Dorofeev, A.
Gookin, B.
Harton, J. L.
Petrov, Y.
Rovero, A. C.
Publication Year :: 2013
Abstract: A method of absolute calibration for large aperture optical systems is presented, using the example of the Pierre Auger Observatory fluorescence detectors. A 2.5 m diameter light source illuminated by an ultra--violet light emitting diode is calibrated with an overall uncertainty of 2.1 % at a wavelength of 365 nm.<br />Comment: 15 pages, 8 figures. Submitted to JINST