Onera (office National D'etudes Et De Recherches Aerospatiales)

Office National D'etudes Et De Recherches Aerospatiales

Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Université Grenoble Alpes

Office National D'etudes Et De Recherches Aerospatiales (onera)

Onera

Silios Technologies

Nicolas Guerineau

Jerome Primot

Guillaume Druart

Florence De La Barriere

Joël Deschamps

Sabrina Velghe

Riad Haidar

Manuel Fendler

Riad Haïdar

Jérôme Primot

Sylvain Rommeluere

Etienne Le Coarer

Tatiana Grulois

J&eacute;r&ocirc;me Primot

Michel Tauvy

Bruno Toulon

Gilles Lafargues

Martin Piponnier

Yann Ferrec

A spectral imager, including: a photodetector including a plurality of photosensitive sites exposed on a photosensitive surface; a collimating lens including an intermediate focal plane; an array of interferometers including two main waves, each including a cavity defined by two faces; an array of microlenses arranged in a plane parallel to the photosensitive surface, each microlens paired with an interferometer to form an optical pair, including an image focal plane coinciding with the photosensitive surface and facing a section of the photosensitive surface.

Fourier transform multi-channel spectral imager

Some embodiments are directed to a wide-field imaging system for the infrared spectral range. The system can include a vacuum chamber that is optically open for the passage of the field rays originating from the scene to be imaged, a cooled dark chamber placed inside the vacuum chamber and provided with a cold diaphragm, an infrared detector placed inside the cooled dark chamber, and a device for optically conjugating the field rays with the detector.

Wide-field infrared imaging system

A method for range imaging allows determining respective distances to multiple objects, based on a single image. The image is captured through a component having a transmittance function of which the Fourier transform is inscribed on a circle within a plane of spatial frequencies. A Fourier transform of the captured image is calculated in order to obtain a total spectrum for the image content. The distance to each object is then calculated based on several homothetic superimpositions of a reference spectrum with the total spectrum, so that said reference spectrum coincides with a portion of the total spectrum each time.

Method and device for range imaging

A micro-machined optical measuring device including: a set of photosensitive detector elements situated on a given face of a first support; a second support, assembled to the first support, forming a prism and including a first face through which a visible radiation is intended to penetrate and a second face, forming a non-zero angle &#x3b8; with the first face and a non-zero angle &#x3b1; with the given face of the first support, the second face being semi-reflective, the first support and the second support being positioned such that an interferometric cavity is made between the second face and the given face, the distance between the given face of the first support and the second face of the second support varying regularly.

Micro-machined imaging interferometer having a static interferometric cavity

The method comprises positioning a diffraction grating with a two-dimensional meshing on the path of the beam to be analyzed and processing at least two interferograms of at least two different colors, each interferogram being obtained in a plane from two sub-beams with different diffraction orders. The invention can be used to analyze and correct divided wavefronts.

Wavefront analysis method involving multilateral interferometry with frequency difference

A method and a system for analyzing the wavefront of a light beam, wherein a diffraction grating is arranged in a plane perpendicular to the light beam to be analyzed and optically conjugated to the analysis plane. Different emerging beams of the grating interfere to generate an image having deformations linked to the gradients of the wavefront to be analyzed. The method is characterized in that the grating carries out the multiplication of an intensity function which is implemented by a two-dimensional grating with hexagonal meshing of surface S transmitting the light of the beam to be analyzed into plural emerging beams arranged in a hexagonal meshing, by an phase function which is implemented by a two-dimensional grating with hexagonal meshing of surfaceS which introduces a phase shift close to 2&#x3c0;/3 (modulo 2&#x3c0;) between two adjacent secondary beams.

Compact achromatic optical interferometer of the three-wave lateral shearing type

The invention aims to integrate a two-wave stationary interferometer on a photodetector during fabrication in order to constitute a miniature stationary Fourier transform spectrometer. The interferometer essentially comprises a plate having a first plane face coinciding with an image plane on semiconductor photosensitive elements and a second face that is not parallel to the first face. The second face reflects a wave that has a phase difference relative to the incident wave interfering with it that is a function of the local thickness of the plate.

Stationary fourier transform spectrometer

In a process for analyzing the wavefront of a light beam, a diffraction grating with rectangular meshing is placed in a plane perpendicular to the light beam to be analyzed and optically conjugate with the analysis plane. Different emergent beams from the grating interfere to form an image whose deformations are related to the slopes of the wavefront analyzed. The grating multiplies an intensity function, implemented by a two-dimensional intensity grating, which defines a rectangular meshing of sub-pupils transmitting the light from the beam to be analyzed into a plurality of emergent beams disposed in accordance with a rectangular meshing, with a phase function implemented by a two-dimension phase grating which introduces a phase shift between two adjacent emergent beams such that the two emergent beams are in phase opposition.

Achromatic optical interferometer with continuously adjustable sensitivity

Growing community of inventors

Antony, France

Nicolas Guerineau