Stationary Fourier transform spectrometry is an interesting concept for building reliable field or embedded spectroradiometers, especially for the mid- and far- IR. Here, a very compact configuration of a cryogenic stationary Fourier transform IR (FTIR) spectrometer is investigated, where the interferometer is directly integrated in the focal plane array (FPA). We present a theoretical analysis to explain and describe the fringe formation inside the FTIR-FPA structure when illuminated by an extended source positioned at a finite distance from the detection plane. The results are then exploited to propose a simple front lens design compatible with a handheld package.
© 2012 Optical Society of America
Original Manuscript: December 21, 2011
Manuscript Accepted: February 11, 2012
Published: May 21, 2012
Frédéric Gillard, Yann Ferrec, Nicolas Guérineau, Sylvain Rommeluère, Jean Taboury, and Pierre Chavel, "Angular acceptance analysis of an infrared focal plane array with a built-in stationary Fourier transform spectrometer," J. Opt. Soc. Am. A 29, 936-944 (2012)