THREE-DIMENSIONAL LIGHT ABSORPTION SPECTROSCOPIC IMAGING

摘要

An absorption imaging spectrometer (10) for providing a three-dimensional spectral image of a light-transmitting sample. Temporally incoherent light (12) is used to illuminate the sample (26), with a portion of the beam split off as a reference beam and subsequently recombined with the return beam from the sample after a variable delay path. An optical configuration is provided for modulating a time delay of the reference beam, with the interferogram obtained at each surface of dielectric discontinuity within the sample being deconvolved to derive an absorption spectrum.