Patent ID: 8345235

Claim:
A spectrometer accessory locatable in a spectrometer so that the beam of analyzing radiation of the spectrometer is incident on the accessory, said accessory enabling reflectance measurements to be made on a sample at each of a range of angles, said accessory comprising a housing defining a sample location, optical elements located in said housing for directing analyzing radiation to said sample location and a detector located in said housing for receiving a radiation reflected from the sample, at least one of the optical elements including a mirror which is rotatable and translatable so that it can be oriented to direct the radiation to be incident on the sample over the range of angles, and said detector being movably mounted, the arrangement being such that when said mirror is moved a corresponding movement of the detector occurs to ensure that the radiation reflected from the sample remains incident on the detector; wherein said accessory further comprises a first guide coupled to said mirror for controlling at least one of the rotational and translational movement and a second guide coupled to said detector for controlling movement of said detector.