Patent ID: 8633455

Claim:
A device comprising: an optically stimulated luminescence (OSL) reader for reading an OSL sensor positioned above an optical light pipe of the OSL reader, wherein the OSL reader comprises: a light source emitting stimulation light for stimulating an optically stimulated luminescent material (OSLM) of the OSL sensor; and the optical light pipe for illuminating the OSL sensor with the stimulation light, wherein the stimulation light defines a first light path, wherein the optical light pipe is located on a first light path between the light source and the reading position for the OSL reader, wherein the OSL reader comprises a dichroic mirror positioned so that the stimulation light passes there through and so that luminescence light emitted by the OSL sensor is reflected towards an emitted light detector and wherein the dichroic mirror is located on the first light path between the light source and the optical light pipe, and wherein the OSL reader comprises a green filter for filtering out non-green light in the stimulation light and wherein the green filter is located on the first light path between the light source and the optical light pipe.