DSP based lock-in amplifier

Skillington, Robert George (2013) DSP based lock-in amplifier. [USQ Project]


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This project aims to test the feasibility of, and identify key specifications for a small stand-alone lock-in amplifier using an embedded device. This may be used in conjunction with sensors generating a small signal and used in high noise environments. The intention is that this form of implementation will drastically reduce the cost and size of a lock-in amplifier while maintaining sufficient accuracy and noise immunity.

The specification for this project on 'DSP-Based Lock-in Amplifier' was developed and agreed on with the Faculty of Health, Engineering & Sciences.

For speed, cost and other considerations, computer simulations of microprocessor hardware components were used in this project.

A Dual-phase lock-in amplifier was specifically chosen and examined for this project so as to minimise the component count of future hardware implementations.

Specifications identified as key parameters were ADC resolution, ADC sample frequency and integration time for hardware implementation. The specifications determined by this project are within the specifications of current microprocessors and DSP’s.

Recommendations were made for possible future study.

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Item Type: USQ Project
Item Status: Live Archive
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering (1 Jul 2013 - 31 Dec 2021)
Supervisors: Leis, John
Date Deposited: 06 Mar 2014 06:14
Last Modified: 06 Mar 2014 06:14
Uncontrolled Keywords: feasibility; specifications; dsp based; lock-in amplifier
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
Fields of Research (2020): 40 ENGINEERING > 4009 Electronics, sensors and digital hardware > 400907 Industrial electronics
40 ENGINEERING > 4006 Communications engineering > 400607 Signal processing
40 ENGINEERING > 4008 Electrical engineering > 400801 Circuits and systems
URI: https://sear.unisq.edu.au/id/eprint/24697

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