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首页> 外文期刊>Review of Scientific Instruments >Quartz tube orifice leaks for local, fast‐response gas sampling to mass spectrometers
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Quartz tube orifice leaks for local, fast‐response gas sampling to mass spectrometers

机译：石英管孔泄漏，可将局部快速响应的气体取样到质谱仪

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Simple and versatile quartz tube orifice leaks, suitable for sampling of gas mixtures to mass spectrometers, have been made by heating the tip of a quartz tube in a hydrogen–oxygen flame. With these leaks the requirement of expensive and clumsy differential pumping stages is removed. The quartz probes have been used in gas sampling from catalytic reaction cells at 1 atm to a mass spectrometer. The sampling position can be located within 0.1 mm from the catalyst. Continuous recording of the local gas composition is then achieved with a response time of about 0.05 s, and with a minimum perturbation of the gas flow. The probes have been used in ambient air and at temperatures around 1000 K for extended periods of time without deterioration or plugging. The high stability at elevated temperatures and chemical resistance seem to make these probes useful for various applications, e.g., in sampling from combustion flames. The gas flow through the leak is determined by a very short and narrow constriction at the tube tip. In a leak with a throughput of 1×10-4 Torr l/s at 1 atm inlet pressure, the constriction has a diameter of 5–7×10-4 cm and a length of about 0.015. cm.
机译：通过在氢气-氢气火焰中加热石英管的尖端，可以实现简单而通用的石英管孔泄漏，适用于将气体混合物取样到质谱仪中。对于这些泄漏，不需要昂贵且笨拙的差分泵送级。石英探针已用于在1个大气压下从催化反应池向质谱仪进行气体采样。采样位置可以位于距催化剂0.1毫米以内的位置。然后以约0.05 s的响应时间和最小的气流扰动来连续记录局部气体成分。该探针已在环境空气中和1000 K左右的温度下使用了很长一段时间，而不会变质或堵塞。高温下的高稳定性和耐化学性似乎使这些探头可用于各种应用，例如，从燃烧火焰中取样。通过泄漏的气流由管尖处非常短而狭窄的收缩部决定。在入口压力为1 atm时，泄漏量为1×10-4 Torr / l / s的情况下，缩颈的直径为5-7×10-4 cm，长度约为0.015。厘米。

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    《Review of Scientific Instruments》 |1979年第12期|P.1602-1604|共3页
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