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

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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.
Original languageEnglish
Title of host publicationProceedings of SPIE
Number of pages7
PublisherSPIE - International Society for Optical Engineering
Publication date2019
Article number108950L
Publication statusPublished - 2019
EventFrontiers in Biological Detection: SPIE Conference 10895 - The Moscone Center, San Francisco, United States
Duration: 3 Feb 20194 Feb 2019


ConferenceFrontiers in Biological Detection
LocationThe Moscone Center
CountryUnited States
CitySan Francisco
SeriesProceedings of SPIE, the International Society for Optical Engineering
CitationsWeb of Science® Times Cited: No match on DOI

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