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虽然人们已证实微波干涉仪可以用来观测等离子区,但还有一些问题未解决。标准电桥电路的输出对相移和衰减很敏感,就是其中的一个问题。这种敏感对于那些由于无极放电而产生的重复等离子区来说妨碍并不太大,因为在等离子区持续期间调节已校准的移相器和衰减器,电桥便可重新平衡。然而,对于那些在冲击管、冲击隧道、靶埸等中产生的非重复短
Although microwave interferometers have proven to be useful for observing the plasma region, there are still some issues that remain to be solved. One of the issues is the sensitivity of the output of a standard bridge circuit to phase shifts and decay. This sensitivity is not too much of an obstacle for those repetitive plasma regions due to the electrodeless discharge because the bridge is rebalanced by adjusting the calibrated phase shifters and attenuators for the duration of the plasma zone. However, for those non-repetitive shorts that occur in impact tubes, impingement tunnels, targets, and the like