Infrared focal plane array with a built-in stationary Fourier-transform spectrometer: basic concepts

Abstract

A novel configuration of stationary Fourier transform infrared (FTIR) spectrometer is presented. Contrary to classic configurations, the interferometer is directly integrated in the focal plane array (FPA) during its process of fabrication. A first, to the best of our knowledge, demonstration of the spectrometric function has been achieved departing from a well-known structure of an HgCdTe photodetector. We show that the obtained FTIR-FPA can be described by intrinsic parameters such as an optical path difference and a so-called spectrometric efficiency. First experimental results are presented.

Atise: a miniatureFourier-transform spectro-imaging concept for surveying auroras and airglow monitoring from a 6/12u cubesat

“…ATISE instrument is based on the MICROSPOC principle that was described in [1] and [2] It is made of a two-wave interferometer glued in front of the detector. Rays coming from infinite are partly reflected by the detector face and the substrate face as illustrated in fig.…”

Biomedical optical spectroscopic techniques to characterize medicinal drug Fibril-SF powder

“…The computerized FT instrument may save the IR or Raman Spectrum of samples for different data processing's. Thus, it is interesting for many researchers in the fields of biochemistry, biomedicine, biophysics and biomaterials to use both vibrational spectroscopes' to investigate structural components of biosamples [6][7][8] . In many fields such as Biomedicine, Biochemistry, Biophysics and Bio Materials, the biomedical optical spectroscopy techniques such as FT-IR & FT-Raman are interesting.…”

“…The sample is radiated by IR light to IR spectroscopy, and The Vibration introduced by electrical dipole moment is detected. In Raman spectroscopy, the samples is illuminated by a monochromatic visible or near IR light from a laser source and its vibration during the electrical polarisability changes are determined [5,8,9]. Thus, both vibrational techniques may provide complementary information, since the shapes and position of both spectral bands on the energy scale are closely located for the specific functional groups of molecule ( fig.2).…”

Inverse problem approaches for stationary Fourier transform spectrometers

“…We have recently proposed a new design of Fourier transform IR (FTIR) spectrometer [1] that operates without the need for a scanning mechanism. The approach consists of designing and building an IR focal plane array (FPA) containing a simple modification that turns it into a stationary FTIR spectrometer.…”

“…1(a). A solution to this problem is to compute the FT over a onedimensional (1D) interferogram extracted from the image using a precise 2D cartography of the optical path difference in front of each pixel of the array [1]. Second, the interferogram is not the result of two wave interferences (as in the Michelson interferometer case).…”