Cooled photodetector
AssigneeSagem SA
InventorJoseph Loiseau
Life of this patent
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Abstract
Cooled photosensitive cell (80) comprising a table (50), sensors (66) which are fitted on the table, a screen (80) to prevent parasitic radiation on the sensors, and at least one Joule-Thomson cooler (41, 42) to cool the table and the screen. The table (50) and the screen (80) are cooled by convection, the table (50) being provided with apertures (55) for passage of the cooling flow, which communicate with an annular cavity (63) for cooling of the screen (80).
Claims6
Cooled photosensitive cell comprising a table having peripheral portions, sensors which are fitted on the table, a screen disposed on said peripheral portions and rising above the table to prevent parasitic radiation on the sensors, and a Joule-Thomson cooler to cool the table and the screen, characterised in that the table and the screen are cooled by convection by the single said cooler disposed below said table, and the table is provided with apertures in said peripheral portions for passage of the cooling flow, said apertures being positioned under an annular cavity in said screen and being in communication with said cavity for allowing said cooling flow to pass therethrough for cooling of the screen.
Dependencies are inferred from the claim text.