MAGNIFICATION OF CONIC MIRROR REFLECTOMETERS

Conic mirror reflectometers are used to measure the diffuse reflectanc e and total integrated scatter of surfaces. In spite of the long histo ry of using conic mirrors for these purposes, the maximum magnificatio n of the three primary types of conic mirror (hemisphere, hemiellipsoi d, and dual paraboloid) had not been compared quantitatively. To our k nowledge, an exact magnification formula has not been published for an y of the three primary conic mirrors. The maximum magnification is nee ded for proper sizing of detectors and radiation sources used with ref lectometers. Exact analytical expressions for the maximum magnificatio n of a Coblentz hemisphere, a hemiellipsoid, and a dual-paraboloid mir ror system are derived and compared.