Meiyi Li, Fei Wang, Yaqi Zhang. Measurement of Nitric Oxide with Low Concentration Based on Mid-Infrared Laser Absorption Spectroscopy[J]. Laser & Optoelectronics Progress, 2018, 55(5): 053002
- Laser & Optoelectronics Progress
- Vol. 55, Issue 5, 053002 (2018)
Fig. 1. Absorption line strengths of NO, CO, H2O, and CO2 with wavelength from 1 μm to 6 μm at 600 K
Fig. 2. Absorption line strengths of NO and H2O with wavenumber from 1900 cm-1 to 1940 cm-1 at different temperatures. (a) 296 K; (b) 600 K; (d) 1000 K
Fig. 3. Diagram of measurement system
Fig. 4. Variation of second harmonic signal-to-noise ratio with modulation current when the volume fraction of NO is 0.46×10-4
Fig. 5. Linear correlation coefficient of second harmonic peak and NO concentration with modulation current of 3-25 mA
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Table 1. Signal-to-noise ratio of second harmonic signal with different modulation currentsdB
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Table 2. Measured concentration of NO, relative deviation, and signal-to-noise ratio of second harmonic signal at room temperature
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Table 3. Measured concentration of NO, relative deviation, and signal-to-noise ratio of second harmonic signal at 600 K
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