Panoramic device for detection of laser pulses

Patent metadata

Field	Value
Publication number	US-9784823-B2
Application number	US-201113989791-A
Country	US
Kind code	B2
Filing date	Nov 25, 2011
Priority date	Nov 26, 2010
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

A panoramic device for detection of laser pulses is provided, sensitive to at least two wavelengths and including a plurality of optical channels and a set of linear sensor arrays, each linear sensor array including a photosensitive area. Each optical channel includes at least two linear sensor arrays, the respective photosensitive areas of said at least two linear sensor arrays being non-contiguous, so that said at least two linear sensor arrays of each optical channel observe non-contiguous angular fields. Moreover, the optical channels are optically juxtaposed to obtain a continuous angular field of surveillance.

First claim

The invention claimed is:

1. A panoramic device for detection of laser pulses, sensitive to at least two wavelengths, comprising:
a plurality of optical channels; and
a set of linear sensor arrays, each linear sensor array including a photosensitive area,
each optical channel including:
a pupil through which light beams enter said each optical channel, and optical means for guiding said light beams in said each optical channel toward a focal plane,

wherein at least one optical channel in the plurality of optical channels includes:
at least two linear sensor arrays in a focal plane of said at least one optical channel, the respective photosensitive areas of said at least two linear sensor arrays in the at least one optical channel being non-contiguous in bearing,

the optical means of the at least one optical channel being configured to guide said light beams toward said at least two linear sensor arrays in the at least one optical channel, such that said at least two linear sensor arrays in the at least one optical channel observe non-contiguous angular fields, and
wherein respective images sensed by the set of linear sensor arrays are interleaved to cover together a continuous angular field.

2. The panoramic device as claimed in claim 1 , wherein the respective images are interleaved by means of:
dimensions of the linear sensor arrays, in particular a width and a height of each of said linear sensor arrays;
a distance between centers of two linear sensor arrays of an optical channel; and
characteristics of said optical means, including an aperture and a focal distance of each of said optical means.

3. The panoramic device as claimed in claim 1 , wherein the plurality of optical channels are disposed side-by-side, the linear sensor arrays of the at least one optical channel having an angular inclination along a longitudinal axis relative to the linear sensor arrays of another optical channel, said angular inclinations being configured such that the respective images are interleaved to cover together the continuous angular field.

4. The panoramic device as claimed in claim 1 , sensitive to at least two wavelengths, wherein said each optical channel includes means for separating said at least two wavelengths.

5. The panoramic device as claimed in claim 4 , wherein said at least two linear sensor arrays in the at least one optical channel are double linear arrays including two columns of sensors, in which one of the columns of sensors includes a filter for one of said at least two wavelengths, said filter constituting the means for separating said at least two wavelengths.

6. The panoramic device as claimed in claim 5 , further including a dichroic plate disposed on an upstream side of each of said at least two linear sensor arrays, said dichroic plate constituting the means for separating said at least two wavelengths.

7. The panoramic device as claimed in claim 1 , wherein said linear sensor arrays are made of Indium Gallium Arsenide (InGaAs).

8. The panoramic device as claimed in claim 1 , wherein the set of linear sensor arrays includes linear sensor arrays made of Silicon (Si) configured to detect laser pulses at a first wavelength and linear sensor arrays made of Indium Gallium Arsenide (InGaAs) configured to detect laser pulses at a second wavelength.

9. The panoramic device as claimed in claim 1 , wherein said each linear sensor array includes a protective window for protecting the photosensitive area of said each linear sensor array.

10. The panoramic device as claimed in claim 1 , wherein a bi-spectral filter is disposed on an upstream side of said pupil such that only light beams having a first or a second wavelength can enter the corresponding optical channel.

11. The panoramic device as claimed in claim 1 , wherein a mono-spectral filter is disposed on an upstream side of at least one linear sensor array such that the at least one linear sensor array is sensitive to only one wavelength.

Assignees

• Beche Arnaud
• Forestier Bertrand
• Perruchot Ludovic
• Thales Sa

Inventors

• Beche Arnaud
• Forestier Bertrand
• Perruchot Ludovic

Classifications

• G01S7/4804

  Auxiliary means for detecting or identifying lidar signals or the like, e.g. laser illuminators · CPC title

• G01S7/495 Primary

  Counter-measures or counter-counter-measures {using electronic or electro-optical means} · CPC title