Fundamental performances of a micro stationary Fourier transform spectrometer

Abstract

International audienceA new configuration of micro-spectrometer based on an infrared stationary Fourier transform (FTIR) interferometer has been developed at ONERA. Our device is based on a classic infrared focal plane array (FPA) of HgCdTe technology with a built-in two-wave wedge-like interferometer. This new architecture generates research works in several domains. Technological researches are conducted in collaboration with the CEA to optimize the manufacturing process and reduce the technological defects. In parallel, researches in optical design are conducted to implement the FTIR-FPA in a complete system. For this, theoretical work is needed to understand and describe the fringes formation inside the detection structure when illuminated by a wave which is not ideal, i.e. emitted by an extended source positioned at a finite distance from the detection plane. The results of this theoretical study are presented. These results are exploited to design a compact spectrometer with a very simple optical architecture. First experimental data are presented and discussed

Simulation and experiment of the static FTIR based on micro multi-step mirrors

“…At the same time, with the urgent requirement for real-time spectral detection and on-line examination, Fourier transform spectrometer with small volume and little mass is indispensable in some special fields [2], such as spacial detection, environmental monitoring, chemical analysis and biomedical diagnostics, etc. Till now, many kinds of micro FTS based on micro optical electro mechanical systems (MOEMS) technology have been investigated [3][4][5][6][7][8][9][10]. However, most of the works are based on temporal modulation; their moving precision and system stability are still big problems.…”

Angular acceptance analysis of an infrared focal plane array with a built-in stationary Fourier transform spectrometer

“…A simulation method is presented. In contrast to previous work [11], we have derived the complete formalism for both configurations. In Section 4, a recom-mended architecture of a miniaturized spectrometer based on our FTIR-FPA is proposed.…”

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.…”