Dewar assembly for ir detection systems
AssigneeSemi Conductor Devices—An Elbit Systems-Rafael Partnership
InventorMichael Singer
Life of this patent
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Abstract
A dewar assembly is presented for use in an optical IR detection system defining a light collecting region. The dewar assembly comprises a warm shield unit configured as an enclosure for optically enclosing the light collection region and having an optical window through which incident light enters the dewar. The warm shield defines a reflective inner surface configured such that light portions of the incident light propagating through said optical window onto said inner surface are reflected by the inner surface towards regions outside said light collecting region.
Claims18
A dewar assembly for use in an optical IR detection system of the kind including an IR detector unit, wherein said dewar assembly comprises:
- a base comprising radiation absorbing regions and arranged for defining a light collecting region of the dewar assembly;
- and
- a warm shield unit having an optical window through which incident light enters the dewar, the warm shield unit being configured as an enclosure for optically enclosing the base, and defining a reflective inner surface configured such that light portions of the incident light propagating through said optical window onto said inner surface are reflected by the inner surface towards regions outside said light collecting region.
The dewar assembly of any one of the preceding claims, wherein said reflective inner surface of the warm shield unit is optically exposed to the said light collecting region.
The dewar assembly of any one of the preceding claims, wherein a surface of said radiation absorbing regions, facing said inner surface of said warm shield unit, is highly emissive thereby providing efficient radiation absorbance by said surface of the base.
The dewar assembly of any one of the preceding claims wherein said warm shield unit comprises a side wall substantially extending from said base towards a surface of said warm shield unit in which said optical window is implemented and defining an optical axis of said dewar assembly designating a general direction of light propagation in between said optical window and said light collecting region.
An optical IR detection system comprising:
- an IR detector unit having a light collecting region;
- and a dewar assembly comprising a warm shield unit having an optical window through which incident light enters the dewar, the warm shield unit being configured as an enclosure for optically enclosing the light collecting region, and defining a reflective inner surface configured such that light portions of the incident light propagating through said optical window onto said inner surface are reflected by the inner surface towards regions outside said light collecting region.
Dependencies are inferred from the claim text.