| 摘要 |
The photodetector (80) of high sensitivity comprises a panel (50) with sensors (66), a shield or screen formed by two concentric envelopes (61,62) demarcating a cavity (63) for coolant and a rim (64) limiting a space (65) where sensors are mounted, and at least one cooler (40) of type Joule-Thomson comprising a well (51) of expansion connection by a divergent section (52) of a duct to openings (55,56) in the panel which are in communication with the cavity (63). The panel and the shield are cooled by convection, and the coolant passes through openings (55,56) into the cavity (63) cooling the shield which also protects the sensors from parasitic radiation. The cooling cavity (63) is integrated with the panel (50) and made by machining. The openings (55,56) are located in two diametrically opposite sectors (53,54), and the other two sectors (57,58) are reserved for the strip conductors (59,60). |
