High Accuracy Measurement of Aperture Area Relative to a Standard Known Aperture

摘要

Precise knowledge of the area of apertures used in high precision radiometry isextremely important. A method is presented here for the determination of the area of round and irregularly shaped apertures by comparison to a standard aperture which has been measured by other means to high accuracy. The method presented here is quick and has no physical contact with the fragile edge of the aperture opening.