Digital Lock-in Amplifier Based on Microcontroller |
| |
Authors: | An-li TAO Guo-dong XU Ke-xue LUO Gang-ling ZHANG |
| |
Affiliation: | Shandong University of Science and Technology, College of Information and Electrical Engineering, Qingdao 266510, China |
| |
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. |
| |
Keywords: | digital lock-in amplifier SNR microcontroller |
本文献已被 CNKI 万方数据 等数据库收录! |
|