Spectrometer accessory measuring hemispherical directional reflectivity and -transmissivity of horizontal sample in Ulbricht integrating sphere, includes mirrors or optical fibers forming beam paths

摘要

A basal sphere opening accommodates a sample. For transmissivity measurement, a mirror reflects the horizontal spectrometer beam (9) vertically upward, through the sample holder (4) and sample, into the sphere (5). For reflectivity measurement, a mirror (2) first deflects the horizontal spectrometer beam upwardly. A basal sphere opening accommodates a sample. For transmissivity measurement, a mirror reflects the horizontal spectrometer beam (9) vertically upward, through the sample holder (4) and sample, into the sphere (5). For reflectivity measurement, a mirror (2) first deflects the horizontal spectrometer beam upwardly. One or more further mirrors (7, 8) then redirect the beam into the sphere (5) through a top opening, vertically down onto the sample. At least one mirror deflecting the beam upwardly, can be displaced out of the beam path. It is alternatively semi-reflective An Independent claim is included for the corresponding method of measurement, in which the sample lies in contact with a sample dish largely transparent to the beam. The sample surface faces the inside of the integrating sphere. Preferred features: In a similar variant, optical fiber is used to guide the beam, rather than mirrors.