Inverse problem approaches for stationary Fourier transform spectrometers

Gillard, Frédéric; Lefèbvre, Sidonie; Ferrec, Yann; Mugnier, Laurent M.; Rommeluère, Sylvain; Benoît, Céline; Guérineau, Nicolas; Taboury, Jean

doi:10.1364/ol.36.002444

Cited by 8 publications

(7 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore the 1D interferogram is not a perfect sinusoïd and a simple Fourier transform is not efficient enough to retrieve the spectrum. Within future work, we plan to use inverse problem approaches (proposed in [5]) to obtain the spectrum of the observed scene with a higher accuracy.…”

Section: Image Processing and Firsts Resultsmentioning

confidence: 99%

Compact high-resolution micro-spectrometer on chip: spectral calibration and first spectrum

et al. 2016

Self Cite

View full text Add to dashboard Cite

Compact and hand-held spectrometers may be very interesting for the measurement of spectral signatures of chemicals or objects. To achieve this goal, ONERA and IPAG have developed a new on chip Fourier Transform Spectrometer operating in the visible spectral range with a high spectral resolution (near 2 cm -1 ), named visible HR SPOC (visible High Resolution Spectrometer On Chip). It is directly inspired from the MICROSPOC infrared spectrometer, studied at ONERA in the past years. This spectrometer is made of a stair-step two-wave interferometer directly glued on a CMOS detector making it a very compact prototype. After calibrating the optical path difference, measurements of experimental spectra are presented.

show abstract

Section: Image Processing and Firsts Resultsmentioning

confidence: 99%

Compact high-resolution micro-spectrometer on chip: spectral calibration and first spectrum

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…It consists in producing hyperspectral maps of responses by use of a commercial FTIR spectrometer [10]. An inverse-problem approach is then used to get the spectrum of an unknown source departing from the experimental interferogram and the calibration data [11]. Figure 2 shows examples of hyperspectral data obtained by both TV/4-and TV-FTIR-FPAs.…”

Section: Microspoc: Fundamental Propertiesmentioning

confidence: 99%

“…Indeed, since Microspoc is a static interferometer, it is difficult to separate the components of the residual fixed pattern noise at the spatial frequencies of the interference fringes from the true interference fringes created by the source. Furthermore, the quality of the hyperspectral maps used for the inversion (see [11] and end of section 2) is also crucial, even at spatial frequencies different from the interference fringes. Therefore, in order to reduce this residual fixed pattern noise, two main lines will be followed.…”

Section: Microspoc: Fundamental Propertiesmentioning

confidence: 99%

Dewar cooler integrated MWIR spectrometer for high rates and high dynamic range measurements

Guérineau

Rommeluère

Ferrec

et al. 2015

Next-Generation Spectroscopic Technologies VIII

View full text Add to dashboard Cite

There is a need for compact, hand-held, spectrometers for the measurement of spectral signatures of chemicals or objects. To achieve this goal, a new concept of Fourier-transform interferometer (FTIR) directly integrated on the infrared focal plane array (FPA) has been developed at ONERA. The fundamental properties of this key element called MICROSPOC will be recalled and we will see how those properties can be exploited to get a snapshot, compact and cryogenic MWIR spectrometer. These design rules have been applied to develop a very compact device that combines the metrological properties of a FTIR-FPA of quantum HgCdTe technology with the radiometric performances of a last generation Sofradir detection block (Infrared Detector Dewar Cooler Assembly -IDDCA). The experimental performances of the prototype will be presented, in terms of spectral resolution, acquisition rate, dynamic range and noise equivalent spectral radiance. We will discuss at the end the potential of this technology to meet the requirements of different applications.

show abstract

“…In this paper, we propose another solution based on inversion methods [4], that widely reduces the impact of the disparities of the cut-off wavenumbers over the spectrum. We choose to illustrate the potential of this method by numerical simulations, based on a realistic description of an IRFPA (see Section 3).…”

Section: Introductionmentioning

confidence: 99%

Relevance of an inverse problem approach to overcome cut-off wavenumbers disparities in infrared stationary Fourier transform spectrometers

et al. 2012

Self Cite

View full text Add to dashboard Cite

One of the major limitations to the use of infrared focal plane arrays (IRFPAs) in stationary Fourier transform spectrometers (FTSs) comes from the spatial inhomogeneities of the pixel responses, where the inhomogeneities of the cut-off wavenumbers of the pixels can prevail. The hypothesis commonly assumed for FTSs that all the pixels are equivalent is thus inaccurate and results in a degradation of the estimated spectrum, even far from the cut-off wavenumbers. However, if the individual spectral responses of the pixels are measured beforehand, this a priori information can be used in the inversion process to produce reliable spectra. Thus, spatial inhomogeneities are not an obstacle for the use of infrared stationary FTS. This result is illustrated in this paper by numerical simulations, based on a realistic description of an IRFPA.

show abstract

Inverse problem approaches for stationary Fourier transform spectrometers

Cited by 8 publications

References 6 publications

Compact high-resolution micro-spectrometer on chip: spectral calibration and first spectrum

Compact high-resolution micro-spectrometer on chip: spectral calibration and first spectrum

Dewar cooler integrated MWIR spectrometer for high rates and high dynamic range measurements

Relevance of an inverse problem approach to overcome cut-off wavenumbers disparities in infrared stationary Fourier transform spectrometers

Contact Info

Product

Resources

About