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7 March 2019 Monitoring of ammonia in an aqueous environment using a supercontinuum-based photoacoustic sensing system
Manoj Kumar Dasa, Abubakar I. Adamu, Jakob Janting, Kyei Kwarkye, Christos Markos, Ole Bang
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Proceedings Volume 10895, Frontiers in Biological Detection: From Nanosensors to Systems XI; 108950L (2019) https://doi.org/10.1117/12.2510351
Event: SPIE BiOS, 2019, San Francisco, California, United States
Abstract
We demonstrate a robust photoacoustic medium for measuring the concentration of ammonia in an aqueous solution. We target the near-infrared (NIR) overtone absorption band (~1540 nm) of ammonia with a supercontinuum (SC) laser-based excitation system and an immersion-based acoustic transducer as the detection system. We further present how such a simple system can be used to perform effective in-situ measurements of ammonia over a range of concentrations with a sensitivity of parts per million (ppm) by volume and linearity of <96%. We demonstrate how the sensing system can be readily tailored to monitor the concentrations of other miscible gases in the aqueous solution.
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Manoj Kumar Dasa, Abubakar I. Adamu, Jakob Janting, Kyei Kwarkye, Christos Markos, and Ole Bang "Monitoring of ammonia in an aqueous environment using a supercontinuum-based photoacoustic sensing system", Proc. SPIE 10895, Frontiers in Biological Detection: From Nanosensors to Systems XI, 108950L (7 March 2019); https://doi.org/10.1117/12.2510351
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KEYWORDS
Absorption
Photoacoustic spectroscopy
Sensing systems
Transducers
Environmental monitoring
Photonics
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