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本文在充分考虑到气体可压缩性的前提下，对微孔内气流作了研究，导出微孔中气流运动方程，弄清了负相检测的原理，得出了与常规相反的结论：负相检测焊口气密性的效果在一定条件下好于正相检测．
In this paper, the gas flow in the micropore is studied under the precondition that the compressibility of the gas is fully taken into account. The equation of the gas flow in the micropore is derived, the principle of negative phase detection is clarified, and the opposite conclusion is obtained: negative phase The effect of testing the gastightness of the welding mouth is better than that of the normal phase under certain conditions.