Device for detecting objects by holography
AssigneeCommissariat A L'energie Atomique Et Aux Energies Alternatives
InventorChristophe Constancias
Life of this patent
Estimating the term…
Abstract
A device for detecting at least one object present in a sample, the device including a light source to emit at least one incident wave at a wavelength λ, a detection volume intended to receive the object, and to receive at least one incident wave, an image sensor positioned to receive at least one scattered light wave obtained by diffraction of the incident wave on the object and a reference wave from the source and not diffracted on the object and to generate a holographic image, and a computer data processing device to digitally reconstruct the object based at least on the holographic image and the wavelength λ. The device also comprises a support comprising patterns organized to form at least one diffraction grating, the grating being periodic and having a pitch P, such that λ/2≤P≤2λ.
Claims25
A device for detecting at least one object, the device including:
- a light source configured to emit incident waves at a wavelength λ,
- a detection volume intended to receive the object, and to receive the incident waves,
- an image sensor positioned to receive at least scattered waves obtained by scattering incident waves on the object and reference waves corresponding to incident waves not scattered on the object, the sensor being configured to generate a holographic image based at least on the scattered waves and on the reference waves,
- a computer data processing device configured to digitally reconstruct the object based at least on the holographic image and the wavelength λ,
- wherein the device further comprises at least one support comprising patterns organized to form at least one periodic diffraction grating having a pitch P, such that λ/2≤P≤2λ, such that the scattered waves collected by the sensor comprise:
- waves from the source which were scattered by the object without being diffracted by the at least one diffraction grating, and
- waves from the source which were both diffracted by the at least one diffraction grating and both scattered by the object.
Dependencies are inferred from the claim text.