Method and apparatus for full phase interferometry
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United States of America Patent
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Jul 1, 2008
Grant Date -
Dec 28, 2006
app pub date -
May 22, 2006
filing date -
May 23, 2005
priority date (Note) -
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Abstract
An apparatus and method for differential spectral interferometry comprising providing an interferometer comprising a light source; employing an element to provide a dithered relative phase shift between target and reference arms of the interferometer, detecting output from the interferometer, demodulating signals received from the detector at different multiples of the dither frequencies, generating more than one real-valued interferograms from demodulated signals, and using the real-valued interferograms to obtain the complex spectral interferogram.
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