Patent ID: 6430941
Filing Date: 2002-08-13
Classification: F25B,G01J

Abstract:
An infrared radiation (IR) detector device defining an overall volume, comprising:a) a casing, having an optical window for admitting radiation; b) a cold shield, disposed within the casing, having a detector mounted therein and having a filter mounted between the optical window and the detector; c) a cooler tube in coiled configuration, disposed within the casing, having an inlet in communication with a pressurized gas source and an expansion nozzle located in the vicinity of said detector; said cooler pipe comprising two serially connected pipe sections, a first section beginning at the inlet to said gas source and a second section terminating at said expansion nozzle; d) a pre-cooling jacket, enclosing the cooler tube and having a gas inlet in the vicinity of the detector and a gas discharge vent to the outside; and e) wherein said pre-cooling jacket comprises two serially connected sections, a first section, containing said first cooler pipe section, and formed by an outer wall and an inner wall wherein said outer wall is completed by a plate, and a second section, containing said second cooler pipe section, and formed by an outer wall and an inner wall, wherein said outer wall is completed by a top plate and said inner wall is completed by a bottom plate; f) said pre-cooling jacket is bent back upon itself such that said second section of said jacket, containing said second section of said cooler pipe is enclosed within the space bound by said first section of said pre-cooling jacket containing said first section of said cooler pipe, whereby said second section of said jacket, containing said second section of said cooler pipe is circumscribed within the overall volume of said detector device.