[1] D. Viveiros, J. Ribeiro, J. P. Carvalho, J. Ferreira, A. M. R. Pinto, R. A. Perez-Herrera, et al., “Fiber optic sensing system for monitoring of coal waste piles in combustion,” in Proc. SPIE, vol. 9157, pp. 91573O-1-91573O-14, 2014.
[2] G. Busca, L. Lietti, G. Ramis, and F. Berti, “Chemical and mechanistic aspects of the selective catalytic reduction of NO(x) by ammonia over oxide catalysts: A review,” Applied Catalysis B: Environmental, 1998, 18(1-2): 1-36.
[3] L. R. Narasimhan, W. Goodman, and C. K. Patel, “Correlation of breath ammonia with blood urea nitrogen and creatinine during hemodialysis,” Proceedings of the National Academy of Sciences of the United States of America, 2001, 98(8): 4617-4621.
[4] J. Hodgkinson and R. P. Tatam, “Optical gas sensing: a review,” Measurement Science and Technology, 2013, 24(1): 012004-1-012004-95.
[5] M. Ferm, “Method for determination of atmospheric ammonia,” Atmos. Environ (1967), 1979, 13(10): 1385-1393.
[6] R. Kincaid, K. Johnson, G. H. Mount, D. Yonge, J. Havig, H. Westberg, et al., “Measurement of atmospheric ammonia at a dairy using differential optical absorption spectroscopy in the mid-ultraviolet,” Atmospheric Environment, 2002, 36(11): 1799-1810.
[7] J. E. Sickles, L. L. Hodson, W. A. McClenny, R. J. Paur, T. G. Ellestad, J. D. Mulik, et al., “Field comparison of methods for the measurement of gaseous and particulate contributors to acidic dry deposition,” Atmospheric Environment. Part A. General Topics, 1990, 24(1): 155-165.
[8] A. Schmohl, A. Miklos, and P. Hess, “Detection of ammonia by photoacoustic spectroscopy with semiconductor lasers,” Applied Optics, 2002, 41(9): 1815-1823.
[9] A. O’Keefe and D. A. G. Deacon, “Cavity ring-down optical spectrometer for absorption measurements using pulsed laser sources,” Review of Scientific Instruments, 1988, 59(12): 2544-2551.
[10] B. Galle, L. Klemedtsson, B. Bergqvist, M. Ferm, Kare Tornqvist, D. W. Griffith, et al., “Measurements of ammonia emissions from spreading of manure using gradient FTIR techniques,” Atmospheric Environment, 2000, 34(26): 4907-4915.
[11] G. P. Wyers, R. P. Otjes, and J. Slanina, “A continuous-flow denuder for the measurement of ambient concentrations and surface-exchange fluxes of ammonia,” Atmospheric Environment. Part A. General Topics, 1993, 27(13): 2085-2090.
[12] M. P. Keuken, A. Wayers-Ijpelaan, J. J. Mols, R. P. Otjes, and J. Slanina, “The determination of ammonia in ambient air by an automated thermodenuder system,” Atmospheric Environment (1967), 1989, 23(10): 2177-2185.
[13] L. P. Breitenbach and M. Shelef, “Development of a method for the analysis of NO2 and NH3 by NO-measuring instruments,” Journal of the Air Pollution Control Association, 1973, 23(2): 128-131.
[14] S. Schilt, L. Thevenaz, M. Nikles, L. Emmenegger, and C. Hüglin, “Ammonia monitoring at trace level using photoacoustic spectroscopy in industrial and environmental applications,” Spectrochim Acta A Mol Biomol Spectrosc, 2004, 60(14): 3259-3268.
[15] B. Timmer, W. Olthuis, and A. V. D. Berg, “Ammonia sensors and their applications—a review,” Sensors and Actuators B: Chemical, 2005, 107(2): 666-677.
[16] R. Claps, F. V Englich, D. P. Leleux, D. Richter, F. K. Tittel, and R. F. Curl, “Ammonia detection by use of near-Infrared diode-laser-based overtone spectroscopy,” Applied Optics, 2001, 40(24): 4387-4394.
[17] G. J. Fetzer, A. S. Pittner, W. L. Ryder, and D. A. Brown, “Tunable diode laser absorption spectroscopy in coiled hollow optical waveguides,” Applied Optics, 2002, 41(18): 3613-3621.
[18] H. Huszar, A. Pogany, Z. Bozoki, A. Mohacsi, L. Horvath, and G. Szabo, “Ammonia monitoring at ppb level using photoacoustic spectroscopy for environmental application,” Sensors and Actuators, B: Chemical, 2008, 134(2): 1027-1033.
[19] J.-P. Besson, S. Schilt, E. Rochat, and L. Thevenaz, “Ammonia trace measurements at ppb level based on near-IR photoacoustic spectroscopy,” Applied Physics B, 2006, 85(2-3): 323-328.
[20] D. S. Baer, J. B. Paul, M. Gupta, and A. O’Keefe, “Sensitive absorption measurements in the near-infrared region using off-axis integratedcavity- output spectroscopy,” Applied Physics B, 2002, 75(2-3): 261-265.
[21] B. A. Paldus, B. G. Fidric, S. S. Sanders, S. M. Tan, H. Pham, A. A. Kachanov, et al., “High sensitivity detectors based on cavity ring-down spectroscopy,” in Proc. SPIE, vol. 5617, pp. 312-322, 2004.
[22] Pacific Northwest National Laboratory, “PNNL-available compounds by CAS number.” [Online].Available at: https://secure2.pnl.gov/nsd/NSD.nsf/OrderCAS OpenView&View=CAS&Start=1&Count=30. [Accessed: 24-Apr-2013].
[23] J. D. Ingle and S. R. Crouch, Spectrochemical Analysis. London, UK: Prentice Hall, 1988. S. Schilt, L. Thevenaz, and P. Robert, “Wavelength modulation spectroscopy: combined frequency and intensity laser modulation,” Applied Optics, 2003, 42(33): 6728-673.
[24] V. Thomsen, D. Schatzlein, and D. Mercuro, “Limits of detection in spectroscopy,” Spectroscopy, 2003, 18(12): 112-114.