Fourier transform spectroscopy is a widely employed method for obtaining visible and infrared spectral imagery,with applications ranging from the desktop to remote sensing.Most fielded Fourier transform spectrometers(FTS)employ the Michelson interferometer and measure the spectrum encoded in a time-varying signal imposed by the source spectrum interaction with the interferometer.A second,less widely used form of FTS is the spatial FTS,where the spectrum is encoded in a pattern sampled by a detector array.