Leis, J. and Martin, P. and Buttsworth, D. (2012) Simplified digital lock-in amplifier algorithm. Electronics Letters, 48 (5). pp. 259-261. ISSN 0013-5194
Abstract
The phase-sensitive or 'lock-in' amplifier is a fundamental tool in experimental physics, and is able to extract exceedingly small signals in the presence of noise. Recently, there has been some interest in portable or embedded lock-in amplifiers for instrumentation and sensing. One difficulty with digital lock-ins is the required degree of numerical precision. This letter presents a fast algorithm for combined phase-sensitive multiplication and filtering. It exploits symmetry to reduce the number of arithmetic operations, and is suitable for low-power embedded devices. As well as being computationally much simpler than a direct digital implementation, the results presented show that it yields a lower error in the estimation of the underlying signal amplitude.
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| Item Type: | Article (Commonwealth Reporting Category C) |
|---|---|
| Refereed: | Yes |
| Item Status: | Live Archive |
| Additional Information: | Permanent restricted access to published version due to publisher copyright policy. |
| Faculty/School / Institute/Centre: | Historic - Faculty of Engineering and Surveying - Department of Electrical, Electronic and Computer Engineering (Up to 30 Jun 2013) |
| Faculty/School / Institute/Centre: | Historic - Faculty of Engineering and Surveying - Department of Electrical, Electronic and Computer Engineering (Up to 30 Jun 2013) |
| Date Deposited: | 06 Aug 2012 09:11 |
| Last Modified: | 18 Jul 2014 05:12 |
| Uncontrolled Keywords: | digital instrumentation; measurement; digital filters; amplifiers; low-power electronics |
| Fields of Research (2008): | 09 Engineering > 0906 Electrical and Electronic Engineering > 090603 Industrial Electronics 09 Engineering > 0906 Electrical and Electronic Engineering > 090609 Signal Processing 09 Engineering > 0906 Electrical and Electronic Engineering > 090601 Circuits and Systems |
| Socio-Economic Objectives (2008): | B Economic Development > 86 Manufacturing > 8616 Computer Hardware and Electronic Equipment > 861604 Integrated Systems |
| Identification Number or DOI: | https://doi.org/10.1049/el.2012.0193 |
| URI: | http://eprints.usq.edu.au/id/eprint/20760 |
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