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Common causes:

  • Beam blocked
  • Low throughput accessory
  • Poor environment
  • Failing source
  • Fogged beamsplitter
  • Poorly tuned moving mirror control
  • Failing detector
  • Electronic fault

Suggestions:

*Follow infrared beam (conceptually, as it is not visible). Make sure path is unobstructed. Does problem exist with accessories removed?
*Reduce environmental vibrations.
*Inspect beamsplitter for fogging, replace if necessary.
*If poorly controlled moving mirror is suspected, try a different scanning velocity. However, if using a detector that has a considerable frequency response dependence, such as a DTGS detector, results may be ambiguous.
*As last resort, swap detector/electronics/power supplies, one at a time.

*
(see also General Noise)

Common causes:

  • Noise is greater at high frequency: interferometer component misaligned
  • Misaligned focussing mirror
  • Scattering sample

Suggestions:

*Align fixed interferometer mirror or other interferometer component with alignment capability.
    *
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