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

Manoj Kumar Dasa, Abubakar Isa Adamu, Jakob Janting, Kyei Kwarkye, Christos Markos, Ole Bang

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    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.
    Original languageEnglish
    Title of host publicationProceedings of SPIE
    Number of pages7
    Volume10895
    PublisherSPIE - International Society for Optical Engineering
    Publication date2019
    Article number108950L
    DOIs
    Publication statusPublished - 2019
    EventFrontiers in Biological Detection: SPIE Conference 10895 - The Moscone Center, San Francisco, United States
    Duration: 3 Feb 20194 Feb 2019

    Conference

    ConferenceFrontiers in Biological Detection
    LocationThe Moscone Center
    Country/TerritoryUnited States
    CitySan Francisco
    Period03/02/201904/02/2019
    SeriesProceedings of SPIE, the International Society for Optical Engineering
    Volume10895
    ISSN0277-786X

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