A real-time and portable digital lock-in amplifier for quartz enhanced photo-acoustic spectroscopy (QEPAS)

Hervé Tatenguem; Amrita Josnan; Morten Hoppe; Tobias Milde; Joachim Sacher

doi:10.1117/12.2545940

2 March 2020 A real-time and portable digital lock-in amplifier for quartz enhanced photo-acoustic spectroscopy (QEPAS)

Hervé Tatenguem, Amrita Josnan, Morten Hoppe, Tobias Milde, Joachim Sacher

Proceedings Volume 11287, Photonic Instrumentation Engineering VII; 112870Y (2020) https://doi.org/10.1117/12.2545940
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

Lock-in amplifiers are a powerful tool for signal detection within a noise environment. Commercial Lock-in amplifiers are bulky and disqualified for handheld operation. We report recent progress on FPGA based lock-in real-time detection scheme with the application in Quartz-Enhanced-Photo-Acoustic Spectroscopy (QEPAS). The new QEPAS configuration is tested and verified on a fast Methane detection scheme in the 1650 nm spectral regime. The novel FPGA detection scheme can be easily transferred into other spectral regimes and offers the opportunity of multi-species real-time measurements.

Conference Presentation

Citation Download Citation

Hervé Tatenguem, Amrita Josnan, Morten Hoppe, Tobias Milde, and Joachim Sacher "A real-time and portable digital lock-in amplifier for quartz enhanced photo-acoustic spectroscopy (QEPAS)", Proc. SPIE 11287, Photonic Instrumentation Engineering VII, 112870Y (2 March 2020); https://doi.org/10.1117/12.2545940

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