In chapter 4, rapid- and step-scan phase modulation FTIR-PAS are applied in depth profile of UV-photooxidized PE and PP, which are regarded as continuous layered materials.
论文第四章将光氧化降解的聚烯烃视为连续变化的层状材料,采用快扫描和步进扫描相调制傅立叶变换红外光声光谱对其进行深度剖析。
参考来源 - 层状聚合物复合材料的傅立叶变换红外光声光谱深度剖析研究·2,447,543篇论文数据，部分数据来源于NoteExpress
采用移相调制的多重斩波电路，可以提高等效开关频率，因此可应用在中大功率场合。
With the shift-phase modulated multiple chopper circuit, the equivalent switch frequency can be improved, so it can be used in large power occasion.
针对传统数字调制信号频谱扩展问题，提出具有相位突变特性的时相调制(TPM)方式。
Aiming at the spectrum spread problem of traditional digital modulation signals, a time-phase modulation (TPM) method with abrupt phase change characteristic is proposed.
另外，为了得到三相调制电压的符号，文中提出了一种符号滞后判断方法，证明了上述控制方法的实时性。
In order to obtain the signs of modulation voltages, the paper also proposes a hysteretic sign calculation algorithm and proves the real-time property of the control method.
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