[1] Xue W B, Xu Y L, Tang X L et al. Impacts of ammonia emission on PM2.5 pollution in China[J]. China Environmental Science, 36, 3531-3539(2016).

[2] Zheng J Y, Zhang L J, Zhong L J et al. Area source emission inventory of air pollutant and its spatial distribution characteristics in Pearl River Delta[J]. China Environmental Science, 29, 455-460(2009).

[3] Bogusky R T, Aoki T T. Early events in the initiation of ammonia formation in kidney[J]. The Journal of Biological Chemistry, 258, 2795-2801(1983).

[4] Torres V E, Keith D S, Offord K P et al. Renal ammonia in autosomal dominant polycystic kidney disease[J]. Kidney International, 45, 1745-1753(1994).

[5] Manne J, Sukhorukov O, Jäger W et al. Pulsed quantum cascade laser-based cavity ring-down spectroscopy for ammonia detection in breath[J]. Applied Optics, 45, 9230-9237(2006).

[6] Manne J, Jäger W, Tulip J. Sensitive detection of ammonia and ethylene with a pulsed quantum cascade laser using intra and interpulse spectroscopic techniques[J]. Applied Physics B, 94, 337-344(2009).

[7] Mohebbifar M R, Khalilzadeh J, Dibaee B et al. Effect of buffer gases on the performance of SO2 trace measurement based on photoacoustic spectroscopy[J]. Infrared Physics & Technology, 65, 61-66(2014).

[8] Peltola J, Vainio M, Hieta T et al. High sensitivity trace gas detection by cantilever-enhanced photoacoustic spectroscopy using a mid-infrared continuous-wave optical parametric oscillator[J]. Optics Express, 21, 10240-10250(2013).

[9] Yin X K, Dong L, Ma W G et al. Research progress of quartz-enhanced photoacoustic spectroscopy technique[J]. Journal of Atmospheric and Environmental Optics, 10, 197-204(2015).

[10] Wang J W, Xie H, Liang L R et al. Tunable fiber laser based photoacoustic spectrometer for breath ammonia analysis during hemodialysis1[J]. Laser Physics, 22, 327-330(2012).

[11] Zhao H, Zheng A P, Li Y H et al. Research on trace gas detection based on long pass and near infrared photoacoustic spectrum[J]. Journal of Light Industry, 34, 89-95(2019).

[12] Liu X, Chen Y Y, Zeng Y G et al. Tunable DFB laser diode based on high-order surface isolation grooves working at 905 nm[J]. Optics Communications, 481, 126528(2021).

[13] Yang X, Liu L, Li J Y et al. Mid-infrared DFB-ICLs based sensor design for odorous ammonia monitoring[J]. Journal of Atmospheric and Environmental Optics, 12, 411-418(2017).

[14] Tittel F K, Lewicki R, Lei D et al. Real time detection of exhaled human breath using quantum cascade laser-based sensor technology[J]. Photons Plus Ultrasound: Imaging and Sensing 2012(2012).

[15] Lewicki R, Kosterev A A, Thomazy D M et al. Real time ammonia detection in exhaled human breath using a distributed feedback quantum cascade laser-based sensor[J]. Quantum Sensing and Nanophotonic Devices VIII(2011).

[16] Zhang Y, Yang C A, Shang J M et al. Research progress of semiconductor inter-band cascade lasers[J]. Acta Optica Sinica, 41, 0114004(2021).

[17] Childs D T D, Hogg R A, Revin D G et al. Sensitivity advantage of QCL tunable-laser mid-infrared spectroscopy over FTIR spectroscopy[J]. Applied Spectroscopy Reviews, 50, 822-839(2015).

[18] Schilt S, Thévenaz L, Niklès M et al. Ammonia monitoring at trace level using photoacoustic spectroscopy in industrial and environmental applications[J]. Spectrochimica Acta Part A, Molecular and Biomolecular Spectroscopy, 60, 3259-3268(2004).

[19] Narasimhan L R, Goodman W, Patel C K. Correlation of breath ammonia with blood urea nitrogen and creatinine during hemodialysis[J]. Proceedings of the National Academy of Sciences of the United States of America, 98, 4617-4621(2001).

[20] Sun X F, Kang Z H, Jiang Y et al. Experimental investigation on gas concentration measurement of methane by LED[J]. Acta Photonica Sinica, 34, 1183-1186(2005).

[21] Cao Y, Tian X, Cheng G et al. NO2 measurement using fiber coupled broadband LED source combining a Herriott multi-pass cell[J]. Acta Physica Sinica, 68, 194-200(2019).

[22] Pan Y F, Dong L, Yin X K et al. Compact and highly sensitive NO2 photoacoustic sensor for environmental monitoring[J]. Molecules, 25, 1201(2020).