A quadrupole mass spectrometer is used to measure the changes in impurities before and after the discharge.
用四极质谱计来测量放电前后杂质的变化。
A quadrupole mass spectrometer used during launch vehicle testing and launching is given, and the trend of spacecraft leak monitoring technique and equipment is raised.
文中给出了四极质谱计在火箭试验及发射时的应用实例，并提出航天器泄漏监测技术的发展趋势和监测设备的方向。
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