测试科学与仪器2010，Vol.1Issue(3)：285-288,4.DOI:10.3969/j.issn.1674-8042.2010.03.18
Digital Lock-in Amplifier Based on Microcontroller
Digital Lock-in Amplifier Based on Microcontroller
An-li TAO 1Guo-dong XU 1Ke-xue LUO 1Gang-ling ZHANG1
作者信息
摘要
Abstract
A method of implementing high cost-effective and highly integrated digital lock-in amplifier with microcontroller is discussed. And the digital lock-in amplifier is more suitable for measuring low-frequency weak signal.Digital signal sequence is obtained through sampling signal measured over an integer number of signal periods, but digital reference sequence is acquired through mathematical operation, then digital phase sensitive detection can be implemented by calculating the cross-correlation function of digital signal sequence and digital reference sequence.In addition, the frequency response and phase character of the digital lock-in amplifier is analyzed. Finally, the designed digital lock-in amplifier is achieved. Experimental results show that the digital lock-in amplifier can be used for measuring weak signal with low ignal-to-noise ratio.关键词
digital lock-in amplifier/SNR/microcontrollerKey words
digital lock-in amplifier/SNR/microcontroller分类
天文与地球科学引用本文复制引用
An-li TAO,Guo-dong XU,Ke-xue LUO,Gang-ling ZHANG..Digital Lock-in Amplifier Based on Microcontroller[J].测试科学与仪器,2010,1(3):285-288,4.
