acceptable failure rate

First, we discuss allowed leakage of He-Ne laser pipe to air and Ne gas, then the question of the measurement of leakage by using cumulation method is pat forward.

本文讨论了He－Ne激光管对空气及对氦气的允许漏率，提出用累积法对激光管的无损检漏问题，并对其最小可检漏率及特征时间提出一些具体数据。