Patent ID: 8547555

Claim:
A spectrometer comprising: a base plate; a light source mounted to the base plate and configured to transmit light; an interferometer mounted to the base plate, the interferometer receiving light from the light source and outputting modulated light; an accessory compartment configured to accept a sample analysis accessory device, the accessory compartment comprising a first wall extending from the base plate, the first wall comprising a first light port configured to accept first light; a second wall extending from the base plate; and a third wall extending from the base plate between the first wall and the second wall; a sample analysis device mounted to the base plate and separated from the accessory compartment by the first wall, the sample analysis device configured to perform attenuated total reflectance analysis of a sample and comprising a crystal configured to receive second light; a tip configured to press the sample against the crystal; and a detector configured to detect third light after reflection of the second light within the crystal; a first optical element mounted to the base plate and configured to receive and to reflect the modulated light toward the first light port to form the first light; a second optical element mounted to the base plate; and an actuator mounted to the second optical element and configured to move the second optical element between a first position and a second position, wherein, in the first position, the second optical element is configured to receive the modulated light and to reflect the modulated light toward the crystal to form the second light such that the first optical element does not receive the modulated light, and further wherein, in the second position, the second optical element does not receive the modulated light.