Interferometer step scanning systems and methods
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United States of America Patent
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May 1, 2012
Grant Date -
Aug 18, 2011
app pub date -
Feb 16, 2010
filing date -
Feb 16, 2010
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Abstract
In some embodiments, the pathlength difference (retardation) in a step scanning infrared (IR) spectrometer interferometer is maintained under AC servomechanism (servo) control for a first period following a step change, and under DC servo control for a second period following the first period. Data is acquired during and/or after the DC servo control period. Switching off the AC servo control prior to data acquisition allows limiting the dither-frequency noise that could otherwise affect signals of interest, particularly in fast-time-scale applications such as high-speed time-resolved spectroscopy (TSR). A mirror position control circuit controls a mirror position stepping as well as switching a mirror servo control from AC to DC.
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