公开(公告)号：WO1997001738A1

公开(公告)日：1997-01-16

申请号：PCT/IB1996000611

申请日：1996-06-26

申请人： PHILIPS ELECTRONICS N.V. ,  PHILIPS NORDEN AB

发明人： PHILIPS ELECTRONICS N.V. ,  PHILIPS NORDEN AB ,  GALLAGHER, Brian, William ,  BLIONAS, Costas ,  BARBARA, Richard ,  NICOLOSI, Joseph, Anthony

IPC分类号： F25D19/00

CPC分类号： H01J37/244 ,  F17C3/085 ,  F17C2203/0337 ,  F17C2203/0345 ,  F17C2203/0395 ,  F17C2205/0332 ,  F17C2205/0341 ,  F17C2221/014 ,  F17C2223/0153 ,  F17C2223/033 ,  F17C2227/0353 ,  F17C2227/0355 ,  F17C2227/036 ,  F17C2270/0509 ,  F17C2270/0518 ,  F25B9/02 ,  F25D19/006 ,  G01J5/061 ,  H01J2237/002 ,  H01J2237/2442 ,  H01J2237/2555

摘要： A radiation detector having an evacuated envelope (35), a radiation detector (34) on a cold finger support in the evacuated space, a closed cycle gas cooling system (3, 45) to cool the cold finger to provide cryogenic operation of the radiation detector, and a getter (5, 16) in the evacuated space to maintain an evacuated condition. The evacuated envelope includes a radiation window (25). The radiation detector is preferably an X-ray detector employed in an energy dispersive spectrometry system. The evacuated space is preferably held at a pressure of less than about 1 mTorr to achieve molecular flow of remaining gas molecules, minimizing parasitic heat input. The closed cycle gas cooling system employs compressed refrigerant, which is precooled in a counterflow heat exchanger (103) and allowed to expand in proximity to the cold finger, thus absorbing heat and maintaining cryogenic temperatures. A getter material, preferably activated carbon, is provided to absorb gasses and maintain the low pressure during operation. A vibration effect attenuation system (8) is provided to reduce effect of cooler induced reduction in detector resolution.

摘要翻译： 一种辐射检测器，具有抽真空的外壳（35），位于所述抽空空间中的冷手指支撑件上的辐射检测器（34），封闭的循环气体冷却系统（3,45），用于冷却所述冷指，以提供辐射的低温操作 检测器和吸气器（5,16）在真空空间中以维持抽空状态。 抽空的外壳包括辐射窗（25）。 放射线检测器优选地是用于能量色散光谱测定系统中的X射线检测器。 抽真空的空间优选保持在小于约1mTorr的压力下，以实现剩余气体分子的分子流动，使寄生热输入最小化。 封闭循环气体冷却系统采用压缩制冷剂，其在逆流热交换器（103）中预冷却并允许在冷手指附近膨胀，从而吸收热量并保持低温。 提供吸气剂材料，优选活性炭，以吸收气体并在操作期间保持低压。 提供振动效应衰减系统（8）以减少冷却器诱导的检测器分辨率降低的影响。