A 3 cm X-band microwave interferometer with a phase-lockedamplifier as detector has been used to measure small phase changes as a microwave beam passing through the gas discharge tube.
本文用3厘米微波干涉仪，以锁相放大器作检测器，测量了微波通过气体放电管时所引起的相移。
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From chapter three to chapter five, the three key components of the system: millimeter-wave phaselocked sources, multiple frequency local source, low noise amplifier are designed and tested.