title: Sampling period criterion in a scanning-beam technique.
abstract: The scanning-beam technique for measuring the response of a detector to an irradiance is analyzed. With this method the irradiance responsivity is determined by integration of the spatial responsivity. Since in practice the integration is approximated by a summation over steps with a finite step size, errors are introduced. It is shown both theoretically and experimentally that the error vanishes when the reciprocal step size lies beyond the diffraction limit. Furthermore, comparison shows that experiment and theory are in good agreement.
authors.affiliation: Nederlands Meetinstituut Van Swinden Laboratorium BV, Schoemakerstraat 97, 2628 VK Delft, The Netherlands. cschrama@nmi.nl
authors.forename: C A
authors.initials: CA
authors.lastname: Schrama
authors.forename: E W
authors.initials: EW
authors.lastname: van der Ham