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Monitoring of ammonia in an aqueous environment using a supercontinuum-based photoacoustic sensing system
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Paper 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.

Paper Details

Date Published: 7 March 2019
PDF: 6 pages
Proc. SPIE 10895, Frontiers in Biological Detection: From Nanosensors to Systems XI, 108950L (7 March 2019); doi: 10.1117/12.2510351
Show Author Affiliations
Manoj Kumar Dasa, Technical Univ. of Denmark (Denmark)
Abubakar I. Adamu, Technical Univ. of Denmark (Denmark)
Jakob Janting, Technical Univ. of Denmark (Denmark)
Kyei Kwarkye, Technical Univ. of Denmark (Denmark)
Christos Markos, Technical Univ. of Denmark (Denmark)
Ole Bang, Technical Univ. of Denmark (Denmark)
NKT Photonics (Denmark)


Published in SPIE Proceedings Vol. 10895:
Frontiers in Biological Detection: From Nanosensors to Systems XI
Amos Danielli; Benjamin L. Miller; Sharon M. Weiss, Editor(s)

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