title: Nonlinearity measurements on photometric devices.
abstract: An apparatus for the determination of deviations from linearity between incoming flux and the signal of a photometric device is presented. The response curve is formed exclusively from flux ratio measurements in the neighborhood of 1.0, which assures that the determination of a possible nonlinearity cannot be affected by the nonlinearity itself.
authors.forename: E
authors.initials: E
authors.lastname: Pitz