With the improved availability and performance of low-cost near-infrared diode lasers, quantitative assessment of ammonia ( NH 3 ) as a carbon-free fuel has been made more accessible and affordable in both laboratory research and field applications. In the present study, an absorption sensor for NH 3 measurement was developed by exploiting the affordability and flexibility of a near-infrared fiber-coupled distributed feedback diode laser. The first objective of the present study was to address the incomplete spectroscopic data for the absorption feature near 2.2    μ m through the determination of line strengths and broadening coefficients with collisional partners including NH 3 , O 2 , N 2 , and Ar. Line shape characterization in both an absorption cell and a shock tube behind reflected shock waves was conducted to determine the temperature exponents of these broadening coefficients. The other objective was to demonstrate the capability of the sensor through NH 3 detection in multicomponent mixtures and NH 3 time-history measurements in the shock tube for investigating NH 3 chemical kinetics at engine and gas-turbine-relevant conditions. The NH 3 sensor developed in this study could serve as a cost-effective diagnostic tool for chemical kinetic measurements, combustion monitoring, and other applications where flexibility and robustness are prioritized.


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    Title :

    Diode Laser Absorption Sensor for Ammonia Detection in a Shock Tube


    Contributors:
    Peng, Yuzhe (author) / Sun, Wenting (author)

    Published in:

    AIAA Journal ; 63 , 3 ; 1131-1139


    Publication date :

    2025-03-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





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