An Overview of the Frontier Optica FT-IR Spectrometer . 25
Optical system
The optical system is under the main cover of the instrument. Usually the main cover of the
instrument is closed, but to perform most maintenance tasks the cover has to be open. When
you do this, a safety interlock automatically switches off the power. Nevertheless, the
instrument should be disconnected from the mains before opening the main cover for
maintenance.
Consistent, reliable performance is achieved by having few moving or adjustable parts, and
by extensive insulation of the optical system from the effects of humidity and vibration.
Stability of the optical system
The entire optical system is purged and sealed at the factory. A supply of desiccant placed
within the system removes any water vapor and carbon dioxide that may enter. A desiccant
indicator is fitted in the top cover, which warns you when the desiccant needs changing (an
internal humidity sensor is available as an option).
In the Frontier Optica FT-IR spectrometer, KBr windows separate the sample compartment
from the purged optical system. You can purge the sample compartment with clean, dry,
oil-free air or nitrogen. Either one removes water vapor; however, nitrogen is preferable
because it also removes atmospheric carbon dioxide.
WARNING
Do not use a flammable gas to purge Frontier Optica FT-IR instruments.
The instrument contains a hot source, and a fire or explosion will result.
Only use clean, dry, oil-free nitrogen or air to purge the instrument.
The optics are kinematically mounted to ensure accurate positioning and to make them
rugged. The interferometer is enclosed and mounted on anti-vibration mounts to guard
against air and bench borne disruptions. The interferometer uses very low-friction point
bearings and a frictionless electromagnetic drive to ensure long life.
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