Acta Photonica Sinica, Volume. 52, Issue 3, 0352110(2023)
Ammonia Adsorption Measurement Based on QCLAS Technique（Invited）
Figures & Tables(11)
Fig. 1. Schematic diagram of the structure of the detection system
Fig. 3. Direct absorption signal and fitting of NH3 under different pressures and the residual
Fig. 4. Measured second harmonic spectral signal and data fitting using 50 ppm NH3 and the residual
Fig. 5. Measured second harmonic spectral signal and data fitting using 6.25 ppm NH3 and the residual
Fig. 6. Peak-to-peak value of the second harmonic signal and signal-to-noise ratio
Fig. 7. The relationship between the peak-to-peak value and concentration of the second harmonic wave
Fig. 9. NH3 measurement results under different ambient temperatures and pipes
Table 1. Database parameters for absorption lines
View tableView in ArticleTable 1. Database parameters for absorption lines
Number Wave number/cm-1 Intensity at standard 296K/（cm-1·（molecule·cm-2）-1） Air-broadened halfwidth/
（cm-1·atm-1）
Self-broadened halfwidth/
（cm-1·atm-1）
Lower-state energy/cm-1 Line 1 1.122 055×103 2.103×10-20 0.5 1.044×10-1 5.927 099×102 Line 2 1.122 094×103 4.494×10-20 4.55×10-1 8.58×10-2 4.622 196×102 Line 3 1.122 104×103 4.675×10-20 3.97×10-1 7.98×10-2 4.952 417×102 Line 4 1.122 118×103 7.931×10-20 5.18×10-1 9.2×10-2 4.216 648×102 Line 5 1.122 133×103 9.406×10-20 3.44×10-1 7.39×10-2 5.208 285×102 Line 6 1.122 160×103 4.675×10-20 2.96×10-1 6.83×10-2 5.390 515×102 Line 7 1.122 178×103 4.644×10-20 2.53×10-1 6.29×10-2 5.499 652×102 Line 8 1.122 185×103 9.263×10-20 2.15×10-1 5.76×10-2 5.535 997×102 Line 9 1.122 203×103 2.716×10-20 5.85×10-1 9.84×10-2 3.734 557×102
Table 2. Flow rate settings and corresponding ammonia concentrations
View tableView in ArticleTable 2. Flow rate settings and corresponding ammonia concentrations
Ammonia flow rate/（L·min-1） Nitrogen flow rate/（L·min-1） Ammonia concentration/ppm 0.02 1.78 1.11 0.04 1.76 2.22 0.06 1.74 3.33 0.08 1.72 4.44 0.01 1.70 5.55 0.12 1.68 6.66 0.14 1.66 7.77 0.16 1.64 8.88 0.18 1.62 10 0.36 1.44 20 0.72 1.02 50 1.8 0 100
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Chaofeng YANG, Chenying SHEN, Juncheng LU, Juan WANG, Jie SHAO. Ammonia Adsorption Measurement Based on QCLAS Technique（Invited）[J]. Acta Photonica Sinica, 2023, 52(3): 0352110
Paper Information
Category: Special Issue for Frontiers and Techniques of Laser Spectroscopy
Received: Oct. 30, 2022
Accepted: Dec. 30, 2022
Published Online: Jun. 21, 2023
The Author Email: Jie SHAO (shaojie@zjnu.cn)
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