研究了银膜表面由于吸附吡啶分子而引起的表面二次谐波信号变化。
The changes in the SH signal due to adsorption of pyridine molecules on the Ag film were investigated.
在Nd：YAG强激光光场的作用下，薄膜样品中观察到二次谐波信号，并分析了二次谐波发生的机理。
The optical second harmonic signal was observed using a ND:YAG laser, The mechanism of SHG was discussed.
对传感器信号处理采用的二次谐波反馈电路，电路为闭环系统。
Adopting the reactive circuit of twice harmonic to process the sensor signal, the system is closed loop.
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