Angular acceptance analysis of an infrared focal plane array with a built-in stationary Fourier transform spectrometer.
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.
ONERA-The French Aerospace Lab, Palaiseau, France.
Frédéric
F
Gillard
Yann
Y
Ferrec
Nicolas
N
Guérineau
Sylvain
S
Rommeluère
Jean
J
Taboury
Pierre
P
Chavel