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Proceedings Paper

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

Paper Details

Date Published: 2 March 2020
PDF: 8 pages
Proc. SPIE 11287, Photonic Instrumentation Engineering VII, 112870Y (2 March 2020); doi: 10.1117/12.2545940
Show Author Affiliations
Hervé Tatenguem, Sacher-Lasertechnik GmbH (Germany)
Amrita Josnan, Sacher-Lasertechnik GmbH (Germany)
Morten Hoppe, Sacher-Lasertechnik GmbH (Germany)
Tobias Milde, Sacher-Lasertechnik GmbH (Germany)
Joachim Sacher, Sacher-Lasertechnik GmbH (Germany)


Published in SPIE Proceedings Vol. 11287:
Photonic Instrumentation Engineering VII
Yakov Soskind; Lynda E. Busse, Editor(s)

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