Abstract

Femtosecond laser-induced plasma spectroscopy for in situ ammonia (${\mathrm{NH}}_3$) measurements was demonstrated in ${\mathrm{NH}}_3/{\mathrm{N}}_2$ mixtures. When a femtosecond laser at 800 nm was focused at the flow field, the parent ${\mathrm{NH}}_3$ molecules would be photolyzed to generate electronics excited NH fragments, and then indirect measurements of ${\mathrm{NH}}_3$ could be realized by detecting the NH fluorescence (${\mathrm{A}}^3\mathrm{\Pi }-{\mathrm{X}}^3{\mathrm{\Sigma }}^{-}$) at 336 nm. A detection limit of 205 ppm was achieved. This work is the first attempt, to the best of our knowledge, for ammonia measurements with a femtosecond laser, and the results are useful for the development of ammonia diagnostics.

© 2019 Optical Society of America

Femtosecond laser-induced plasma spectroscopy for combustion diagnostics in premixed ammonia/air flames

Dayuan Zhang, Qiang Gao, Bo Li, Jixu Liu, Yifu Tian, and Zhongshan Li
Appl. Opt. 58(28) 7810-7816 (2019)

Instantaneous one-dimensional equivalence ratio measurements in methane/air mixtures using femtosecond laser-induced plasma spectroscopy

Dayuan Zhang, Qiang Gao, Bo Li, Zhifeng Zhu, and Zhongshan Li
Opt. Express 27(3) 2159-2169 (2019)

Ammonia detection and monitoring with photofragmentation fluorescence

Steven G. Buckley, Christopher J. Damm, Wolfgang M. Vitovec, Lee Anne Sgro, Robert F. Sawyer, Catherine P. Koshland, and Donald Lucas
Appl. Opt. 37(36) 8382-8391 (1998)

Atmospheric ammonia measurement using a VUV/photo-fragmentation laser-induced fluorescence technique

John S. Schendel, Robert E. Stickel, Cornelis A. van Dijk, Scott T. Sandholm, Douglas D. Davis, and John D. Bradshaw
Appl. Opt. 29(33) 4924-4937 (1990)

Ammonia monitoring near 1.5 µm with diode-laser absorption sensors

Michael E. Webber, Douglas S. Baer, and Ronald K. Hanson
Appl. Opt. 40(12) 2031-2042 (2001)