CALIBRATION OF A PERMANENT CONTROL BEACON FOR A 300-METER PHOTOMETRIC RANGE

摘要

This report describes the development and the results of a series of calibrations of a portable projector for the purpose of providing facilities for calibrating a permanent control beacon. This beacon was installed on a 300-meter outdoor photometric range at the National Bureau of Standards. Its calibration involved determinations of atmospheric transmission, and required a portable standard light source with sufficient intensity to be measured photometrically at the distance employed.