基于光声法的甲烷气体检测的研究_毕业设计论文_新浪博客 关键词：光声；甲烷；光声池；锁相放大器 [gap=1749]Key words : photoacoustic, methane, photoacoustic cell, phase-locked amplifier
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A 3 cm X-band microwave interferometer with a phase-locked amplifier 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。
From chapter three to chapter five, the three key components of the system: millimeter-wave phase locked sources, multiple frequency local source, low noise amplifier are designed and tested.
第三章至第五章分别介绍了毫米波锁相源、二倍频本振源和低噪声放大器三个系统关键的单元电路的设计过程和测试结果。
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