Optical device allowing the angular emission pattern of a light source of finite area to be rapidly measured
AssigneeEldim, Inc.
InventorThierry Leroux
Life of this patent
Estimating the term…
Abstract
A device allowing the angular emission pattern of a source to be measured without mechanical movement comprises, in succession, along its optical axis: a first objective, called the Fourier objective, arranged to form a Fourier surface each point of which corresponds to one direction of observation of the object; a diffuser used in transmission and placed on the Fourier surface; a substance of optical density placed upstream of the diffuser and arranged to attenuate the light backscattered toward the Fourier objective and the areal source; and a video photometer located downstream of the plane of the diffuser and arranged to image the surface of the diffuser.
Claims13
A device for measuring an angular emission pattern of a light source of finite area, comprising, successively along an optical axis of the device:
- a first objective configured as a Fourier objective to form a Fourier surface, each point of the Fourier surface corresponding to a direction of observation of the light source;
- a substance of optical density configured to attenuate light backscattered toward the first objective and the light source;
- a diffusing surface used in transmission and arranged on the Fourier surface;
- and
- a video photometer located downstream of the diffusing surface and arranged to image the diffusing surface.
A method for measuring an angular emission pattern of a light source of finite area, the method comprising placing successively along an optical axis:
- a first objective configured as a Fourier objective forming a Fourier surface, each point of the Fourier surface corresponding to a direction of observation of the light source;
- a substance of optical density configured to attenuate light backscattered toward the first objective and the light source;
- a diffusing surface used in transmission and arranged on the Fourier surface;
- and
- a video photometer located downstream of the diffusing surface and arranged to image the diffusing surface.
Dependencies are inferred from the claim text.