Digital Lock-in Amplifier Based on Microcontroller
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 meastwing lowfrequency weak signal. Digital signal sequence is obtained through sampling signal measured over an inte...
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| Veröffentlicht in: | 测试科学与仪器 2010, Vol.1 (3), p.285-288 |
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| container_title | 测试科学与仪器 |
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| creator | 陶安利 徐国栋 骆科学 张钢领 |
| description | 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 meastwing lowfrequency 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. Expermental results show that the digital lock-in amplifier can be used for measuring weak signal with low ignal-to-noise ratio. |
| doi_str_mv | 10.3969/j.issn.1674-8042.2010.03.18 |
| format | Article |
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And the digital lock-in amplifier is more suitable for meastwing lowfrequency 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. Expermental results show that the digital lock-in amplifier can be used for measuring weak signal with low ignal-to-noise ratio.</description><identifier>ISSN: 1674-8042</identifier><identifier>DOI: 10.3969/j.issn.1674-8042.2010.03.18</identifier><language>eng</language><publisher>Shandong University of Science and Technology, College of Information and Electrical Engineering, Qingdao 266510, China</publisher><subject>互相关函数 ; 信号序列 ; 单片机 ; 参考序列 ; 微弱信号 ; 数字相敏检测 ; 数字锁定放大器 ; 数字锁相放大器</subject><ispartof>测试科学与仪器, 2010, Vol.1 (3), p.285-288</ispartof><rights>Copyright © Wanfang Data Co. Ltd. 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| fulltext | fulltext |
| identifier | ISSN: 1674-8042 |
| ispartof | 测试科学与仪器, 2010, Vol.1 (3), p.285-288 |
| issn | 1674-8042 |
| language | eng |
| recordid | cdi_wanfang_journals_cskxyyq201003018 |
| source | Alma/SFX Local Collection |
| subjects | 互相关函数 信号序列 单片机 参考序列 微弱信号 数字相敏检测 数字锁定放大器 数字锁相放大器 |
| title | Digital Lock-in Amplifier Based on Microcontroller |
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