Patent ID: 8482729

Claim:
A spectrometer for interfacing an optical sensor with a display unit, the spectrometer comprising: a plurality of measurement radiation sources; a plurality of radiation source fibers, each radiation source fiber optically coupled to one of the plurality of measurement radiation sources; a reflected radiation fiber optically coupled to the optical sensor; a measurement radiation output fiber comprised of an image fiber; a radiation mixing bar intermediate the plurality of radiation source fibers and the measurement radiation output fiber, an input end of the radiation mixing bar optically coupled with the plurality of radiation source fibers and an output end of the radiation mixing bar optically coupled with the measurement radiation output fiber; a reference radiation fiber having an input end optically coupled to the output end of the radiation mixing bar and an output end optically coupled to an attenuator; a shield housing that is electrically conductive to provide electromagnetic interference shielding, each of the plurality of measurement radiation sources, the plurality of radiation source fibers, the radiation mixing bar, and the reference radiation fiber within the shield housing, wherein the radiation mixing bar is optically coupled to at least one of the plurality of radiation source fibers and the measurement radiation output fiber via a film coupler, and wherein a shim surrounds at least a portion of the film coupler.