Patent ID: 8040506

Claim:
A sensor for a spectrometer, comprising: at least one optical element over which an exciting light source beam is routed and from which a target beam is emitted towards a sample to be analyzed, wherein said at least one optical element is able to move so as to vary the direction of said target beam, wherein said at least one element is able to move between at least two positions, including: a position according to which the axis of said target beam and the axis of said source beam are merged or parallel; and a position according to which the axis of said target beam is substantially perpendicular to the axis of said source beam, wherein said movable at least one optical element comprises at least three lenses disposed so that two of said lenses have the same first focal axis, and the third of said lenses has a second focal axis forming an angle of 90° with said first focal axis, wherein said three lenses are carried by a rotary ring, and wherein said at least one optical element includes a beam splitter.