Sampling, quantization and computational aspects of the quadrature lock-in amplifier. - John Leis; Christopher Kelly; David Buttsworth (ICSPCS, 2012)

Detection of Potentially Explosive Methane Levels Using a Solid-State Infrared Source. - John Leis; David Buttsworth; Chris Snook; Graham Holmes (IEEE Trans. Instrum. Meas., 2014)

A Temperature Compensation Technique for Near-Infrared Methane Gas Threshold Detection. - John Leis; David Buttsworth (IEEE Trans. Ind. Electron., 2016)

Determining the Convergence of Synchronous Measurements for Embedded Industrial Applications. - John Leis; David Buttsworth (IEEE Trans. Ind. Electron., 2017)

A Robust Method for Tuning Photoacoustic Gas Detectors. - John Leis; David Buttsworth (IEEE Trans. Ind. Electron., 2018)