Under pressure

Tim Harrison

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Under pressure

机译：在压力之下

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Joule-Thomson (JT) technology provides an economical solution for cooling infrared detectors and is widely used in many defence applications today. However, there are a number of critical requirements for the cryogenic gas species used to supply JT coolers. The JT effect relies on the isenthalpic expansion of a gas species by means of passing it at high pressure through a small orifice. In cryogenic applications, the gas in question is cooled to its liquefaction point and therefore any contaminants in the form of water vapour, carbon dioxide or hydrocarbons will freeze at the point of expansion (i.e. the orifice), reducing the efficiency of, and in extreme cases, blocking the cooler, potentially impacting missile guidance.

机译：焦耳-汤姆森（JT）技术为冷却红外探测器提供了一种经济的解决方案，并已广泛应用于当今的许多国防应用中。但是，对用于供应JT冷却器的低温气体种类有许多关键要求。 JT效应依赖于气体种类的等焓膨胀，该方式是使气体在高压下通过小孔。在低温应用中，所讨论的气体被冷却到液化点，因此，水蒸气，二氧化碳或碳氢化合物形式的任何污染物都将在膨胀点（即节流孔）处冻结，从而降低了效率，并且在极端情况下情况下，会阻挡冷却器，可能会影响导弹的制导。

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《Defence management journal》 |2013年第61期|137-137|共1页
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Tim Harrison;
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2. Excess Thermodynamic Properties of H_2O and D_2O Solutions of Tetramethylurea, an Azeotropic System. Vapor Pressures, Excess Vapor Pressures, and Vapor Pressure Isotope Effects [J] . Gyorgy Jakli, W.Alexander Van Hook Journal of Chemical and Engineering Data: the ACS Journal for Data . 2001,第3期

机译：共沸体系四甲基脲的H_2O和D_2O溶液的过剩热力学性质蒸气压，过量蒸气压和蒸气压同位素效应
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机译：共沸体系四甲基脲的H2O和D2O溶液的过剩热力学性质。蒸气压，过量蒸气压和蒸气压同位素效应
4. Cuffless and Noninvasive Measurement of Systolic Blood Pressure, Diastolic Blood Pressure, Mean Arterial Pressure and Pulse Pressure using Radial Artery Tonometry Pressure Sensor with Concept of Korean Traditional Medicine [C] . Mikyoung Park, Hee Jung Kang, Young Huh, Engineering in Medicine and Biology Society, 2007 Annual International Conference of the IEEE . 2007

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机译：第Ⅲ组的高压研究：第一部分：高压下铝，镓，铟和铊的熔融曲线和多晶态转变第二部分：高压下铀的相变

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