摘要
激光外差干涉信号属于宽带高频信号,针对这一特点,提出了一种新型的激光外差干涉信号的高频调制信号解调系统。在AD8302相位解调方法的基础上,锁相环的设计可以消除解调结果中的差频信号。结果表明,相比于MATLAB软件解调和AD8302直接解调,该解调系统可以更准确地解调出样品表面1 MHz的微振动信号。因此,本系统是一种有效可行的相位解调方法。
The laser heterodyne interference signals belong to the wideband and high-frequency signals. According to this characteristic,a new kind of high-frequency modulated signals demodulation system for laser heterodyne in-terference signals is proposed. Based on the method of phase demodulation with AD8302,the design of phase locked loop can eliminate the differential frequency signals in the demodulation results. The results show that this demodulation system can demodulate 1 MHz micro-vibration signal on the surface of the sample accurately,com-pared with the MATLAB software demodulation and AD8302 direct demodulation. Therefore,this system is an effec-tive and feasible method for phase demodulation.
出处
《电子器件》
CAS
北大核心
2016年第2期365-369,共5页
Chinese Journal of Electron Devices
基金
教育部博士点基金联合项目(2013142012007)
关键词
测试计量技术及仪器
高频解调
外差探测
锁相环
AD8302
measurement technology and instrument
high-frequency demodulation
heterodyne detection
phase locked loop
