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    • 2. 发明授权
    • Hydrogen evolution analyzer
    • 氢气分析仪
    • US5288645A
    • 1994-02-22
    • US940687
    • 1992-09-04
    • Masato ToshimaJerry Wong
    • Masato ToshimaJerry Wong
    • G01N33/00G06N3/08
    • G06N3/082G01N33/005Y10T436/20Y10T436/22
    • Method for determining temperature ranges at which a selected gas evolves from a specimen of a selected material, bulk or surface of a metal, semiconductor, or insulator, and the probable source of that gas in each such temperature range. A specimen is placed in an evacuated and baked-out tube, and the specimen temperature T is increased according to a selected time-dependent temperature pattern over a temperature range. As temperature T(t) increases, pressure p(t) of any gas evolving in the tube is measured for a sequence of times t. A total pressure derivative, dp/dT=(dp/dt)(dT/dt).sup.-1, is determined, identifying one or more peak temperatures, each having a peak temperature range corresponding to specimen emission of at least one gas by breaking a bond containing an atom or molecule of that emitted gas. Partial pressure rises in the tube at each peak temperature are monitored and converted to an equivalent gas concentration. In a second embodiment, two tubes, with only one containing a specimen, are used for analyzing the differential pressure .DELTA.p=p1- p2 and differential pressure derivative d(.DELTA.p)/dT. In a third embodiment, both tubes contain specimens, and one or more peak temperatures are identified. In each embodiment, composition, partial pressures and concentrations of gases evolved at a peak temperature are optionally determined by residual gas analysis of another specimen in another tube, heated to and held at a peak temperature.
    • 用于确定所选择的气体从所选择的材料,金属,半导体或绝缘体的本体或表面的样品以及在每个这样的温度范围内的可能的气体来源的温度范围的方法。 将样品放置在抽真空的烘管管中,并且在温度范围内根据选定的时间依赖性温度模式增加样品温度T. 随着温度T(t)增加,在时间t的序列中测量管中放出的任何气体的压力p(t)。 确定总压力导数dp / dT =(dp / dt)(dT / dt)-1,识别一个或多个峰值温度,每个峰值温度具有对应于至少一种气体的样品发射的峰值温度范围, 含有该排放气体的原子或分子的键。 在每个峰值温度下管中的部分压力升高被监测并转换为等效气体浓度。 在第二实施例中,仅使用一个包含试样的管用于分析差压(Δ)p = p1-p2和压差导数d((Δa)p)/ dT。 在第三实施例中,两个管都包含试样,并且识别出一个或多个峰值温度。 在每个实施例中,在峰值温度下放出的气体的组成,分压和浓度可任选地通过另一管中另一个试样的残余气体分析来确定,加热到并保持在峰值温度。