Jérôme Genest
University of Ottawa
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Publication
Featured researches published by Jérôme Genest.
Applied Optics | 2002
Raphaël Desbiens; Jérôme Genest; Pierre Tremblay
A radiometric model of the instrument line shape (ILS) of Fourier-transform spectrometers is presented. We show first that common line-shape models are based on distribution of the radiant intensity in the interferometer. The complete steps between the source and the ILS are exposed as the core of the model. Relationships between the ILS, the spectrum as measured by the instrument, and the spectrum as emitted by the scene are demonstrated from the ILS model. Then the formal radiometric modeling of the ILS is derived, including the contribution of the aperture of the optical system. The particular case of a centered circular aperture with a uniform Lambertian radiance in the field of view is discussed. Conditions are deduced to ensure that the only spectral variation of the ILS is a scaling with wave number, as is usually assumed in current line-shape models. The ILS dependence on the scene is also discussed, and the effect of taking into account the radiometry on the ILS is estimated for the case of an ideal thin lens used as a collimator.
Vibrational Spectroscopy | 2002
Jérôme Genest; Pierre Tremblay
The impact of optical aberrations in the input collimator on the instrument line shape of a Fourier-transform spectrometer is modeled using an analytic line shape model. Each third-order aberration is considered separately. Design guidelines are obtained stating which aberrations are more important and allowing to choose the sign of some aberrations to minimize their impact on the line shape.
Applied Optics | 2003
Jérôme Genest; Pierre Tremblay
The effect of diffraction the instrument line shape of a Fourier-transform spectrometer is studied with an analytical line-shape model. The expression for the instrument line shape of a diffracted point source is obtained. A simple condition on the throughput of the instrument is derived under which diffraction is negligible when compared with the field-of-view-induced line shape. The effect of diffraction is illustrated and compared for various instruments.
Fourier Transform Spectroscopy/ Hyperspectral Imaging and Sounding of the Environment (2007), paper JWA6 | 2007
Philippe Saucier; Frédéric Talbot; Jérôme Genest; Pierre Tremblay
We discuss the realisation of an all-fiber spectrometer working on the principle of heterodyne measurement using two high brightness frequency combs exhibiting supercontinua in the NIR (1.2 µm - 1.9 µm).
Proceedings of SPIE, the International Society for Optical Engineering | 2007
Jérôme Genest; Simon Roy; Patrick Dubois; Simon Potvin
Imaging Fourier-transform spectrometers can quickly produce massive amounts of raw data, especially when paired with large focal plane arrays. As the spatial resolution is increased, overwhelming amounts of data must be managed properly. A suitable design of the data processing chain is thus required to minimize the dataload and deliver processed information in real-time. This paper reviews the work being done to tailor data processing pipelines for Fourier-transform spectrometers (FTS) coupled with externally triggered CCD cameras. Various sampling techniques as well as spectral calibration and line shape correction approaches will be reviewed. Since traditional sampling techniques are not well suited for an FTS operating with a CCD camera, a hybrid time-position sampling approach is presented to reduce the number of samples per pixel. Furthermore, the approach enables a sampling jitter correction algorithm that can account for velocity fluctuations and channel delays, such as the CCD integration time. A fast spectral calibration approach is also demonstrated, based on a rapid line shape integration scheme. The calibration algorithm brings all pixel spectra on the same spectral grid and allows the user to directly compare spectral features between pixels. Moreover, the correction method offers software field-widening capabilities by binning pixels after spectral calibration. A large single-pixel detector can thus be emulated from the CCD array, allowing the user to broaden the field of view and to increase the SNR.
Fourier Transform Spectroscopy/ Hyperspectral Imaging and Sounding of the Environment (2007), paper JWA8 | 2007
Simon Roy; Jérôme Genest; Martin Chamberland
A new approach to interferogram sampling is presented. The method reduces data load and processing overhead while allowing post-correction of sampling errors. It is particularly well suited for continuous-scan spectrometers equipped with a CCD camera.
Fourier Transform Spectroscopy/ Hyperspectral Imaging and Sounding of the Environment (2007), paper JWA7 | 2007
Simon Roy; Simon Potvin; Jérôme Genest; Raphaël Desbiens
A new approach to line shape correction is presented. The method uses line shape integration to calibrate the spectral grids of pixels and is thus convenient for spectrometers equipped a CCD camera.
Fourier Transform Spectroscopy: New Methods and Applications (1999), paper FWE17 | 1999
Jérôme Genest; Pierre Tremblay
The theory of partial coherence [1] is an ideal framework to properly model the optical design of Fourier transform spectrometers.
Archive | 2012
Jean-Philippe Déry; Jérôme Genest; Martin Chamberland
Advances in Imaging (2009), paper JTuB14 | 2009
Simon Potvin; Jérôme Genest; Benjamin Couillard; Simon Savary; Martin Chamberland