Patent ID: 8664606
Filing Date: 2014-03-04
Classification: G01J

Abstract:
1. An infrared radiation detector comprising: a cryostat having a cold finger ensuring heat exchange with a cold source, and a window transparent to infrared radiation to be detected; a mechanically fixed cold plane in heat exchange with the cold finger; a detector unit comprising at least a detector circuit sensitive to an infrared wavelength range to be detected, and in direct or indirect heat exchange with the cold plane; a mechanically fixed cold shield in heat exchange with the cold plane and limiting stray radiation, said cold shield having an opening at one end aligned with the cryostat window, an internal wall extending away from said opening, and one axis of revolution; wherein the internal wall has a succession of reliefs distributed in at least one helical pattern, the at least one helical pattern having a definition axis that coincides with the axis of revolution of the cold shield.