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