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Theses

Génération de motifs à haute résolution sans optique: Application à la caractérisation spatiale des détecteurs infrarouge

Abstract : The last decade's amazing advances in microelectronics have led to the development of large infrared focal plane arrays (IRFPAs) with a high density of pixels per square centimetre. Therefore, the characterisation of these new components becomes a challenge, particularly the measurement of the spatial responses, described by the modulation transfer function (MTF). For this purpose, the projection of perfectly known patterns that illuminate the entire surface of the IRFPA and contain sub-pixel details is required. For several years, an original technique of MTF measurement has been explored at ONERA. The first idea was to use the self-imaging property of a grating illuminated by a quasi-monochromatic plane wave, called the Talbot effect. A first test bench has been developed and has produced measurements on IRFPAs working in [1-2,5 µm] and [3-5 µm] spectral ranges. For the long-wavelength infrared (LWIR) spectral range (8-12 µm), the technique appeared to come up against physical limitations (called non-paraxial effects) and other solutions have been explored, based on the use of a particular category of self-imaging fields, called non-diffracting arrays (NDAs). The object of this thesis is to study quantitatively and rigorously these non-paraxial effects and to develop the solutions formerly proposed. In particular, original techniques of generating NDAs of high-resolution (i.e. containing small details, close to the working wavelength) are studied, both theoretically and experimentally. These techniques are based on the use of a panchromatic illumination and a particular class of self-imaging transmittances called the continuously self-imaging gratings. At last, for spectrally-resolved MTF measurements, it is shown that an incoherent summation of monochromatic self-images acquired at different distances can produce patterns analogous to those obtained with panchromatic light.
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https://tel.archives-ouvertes.fr/tel-00008863
Contributor : Emmanuel Di Mambro <>
Submitted on : Thursday, March 24, 2005 - 10:04:37 PM
Last modification on : Thursday, June 2, 2016 - 8:18:24 PM
Long-term archiving on: : Friday, April 2, 2010 - 9:52:58 PM

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  • HAL Id : tel-00008863, version 1

Citation

Emmanuel Di Mambro. Génération de motifs à haute résolution sans optique: Application à la caractérisation spatiale des détecteurs infrarouge. Physique [physics]. Université Paris Sud - Paris XI, 2005. Français. ⟨tel-00008863⟩

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