Patent ID: 6862092

Claim:
An apparatus for measuring spectral information of light from at least one object, comprising: a transparent body having a front side and a back side, the front side including an entrance surface having at least one entrance aperture for receiving light, and at least a first front reflecting surface, and the back side including at least a first back reflecting surface for reflecting light received from the at least one entrance aperture to the at least one front reflecting surface, and an exit surface, at least one of the at least a first front reflecting surface and the at least a first back reflecting surface including a first diffractive optical element, and at least one of the at least a first front reflecting surface and the at least a first back reflecting surface including a first focusing element, the first diffractive element being arranged to disperse diverging light received from the at least one entrance aperture; and a light detector unit arranged to receive the dispersed light through the exit surface from the at least one reflecting surface on the front side.