Measurement of Nitric Oxide with Low Concentration Based on Mid-Infrared Laser Absorption Spectroscopy

Meiyi Li; Fei Wang; Yaqi Zhang

doi:10.3788/LOP55.053002

Laser & Optoelectronics Progress, Volume. 55, Issue 5, 053002(2018)

Measurement of Nitric Oxide with Low Concentration Based on Mid-Infrared Laser Absorption Spectroscopy

Meiyi Li, Fei Wang^*, and Yaqi Zhang

State Key Laboratory of Clean Energy Utilization, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China

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Figures & Tables(8)

Fig. 1. Absorption line strengths of NO, CO, H2O, and CO2 with wavelength from 1 μm to 6 μm at 600 K

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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

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Fig. 3. Diagram of measurement system

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$Variation of second harmonic signal-to-noise ratio with modulation current when the volume fraction of NO is 0.46×10-4$

Fig. 4. Variation of second harmonic signal-to-noise ratio with modulation current when the volume fraction of NO is 0.46×10-4

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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 1. Signal-to-noise ratio of second harmonic signal with different modulation currentsdB

Modulationcurrent /mA	Volume fraction of NO/10^-4
Modulationcurrent /mA	0.46	0.71	1.00	1.31
3	7.83	8.25	8.52	8.37
5	8.89	8.70	9.53	10.49
8	12.44	12.75	13.48	12.76
11	13.53	12.73	14.40	13.62
15	10.22	10.37	11.67	9.59
17	9.28	8.39	9.33	10.26
20	8.42	9.61	8.11	7.39
25	6.34	7.68	5.40	7.43

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 2. Measured concentration of NO, relative deviation, and signal-to-noise ratio of second harmonic signal at room temperature

Given volumefraction ofNO /10^-6	Measured volumefraction ofNO /10^-6	Relativedeviation	Signal-to-noise ratio
6	5.2897	-0.118	9.82
8	9.0681	0.133	9.55
11	11.713	0.065	10.96
13	12.846	-0.012	10.95
17	16.625	-0.022	10.80
20	20.403	0.020	11.60

Table 3. Measured concentration of NO, relative deviation, and signal-to-noise ratio of second harmonic signal at 600 K
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Table 3. Measured concentration of NO, relative deviation, and signal-to-noise ratio of second harmonic signal at 600 K
Given volumefraction ofNO /10^-6 Measured volumefraction ofNO /10^-6 Relativedeviation Signal-to-noise ratio
11 11.560 0.051 10.83
13 12.713 -0.022 10.93
17 16.822 -0.010 10.91
20 20.676 0.034 10.96

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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

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Paper Information

Category: Spectroscopy

Received: Oct. 16, 2017

Accepted: --

Published Online: Sep. 11, 2018

The Author Email: Fei Wang (wangfei@zju.edu.cn)

DOI:10.3788/LOP55.053002

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Signal-to-noise ratio of second harmonic signal with different modulation currentsdB

Table 1. Signal-to-noise ratio of second harmonic signal with different modulation currentsdB

Table 2. Measured concentration of NO, relative deviation, and signal-to-noise ratio of second harmonic signal at room temperature

Table 2. Measured concentration of NO, relative deviation, and signal-to-noise ratio of second harmonic signal at room temperature

Table 3. Measured concentration of NO, relative deviation, and signal-to-noise ratio of second harmonic signal at 600 K

Table 3. Measured concentration of NO, relative deviation, and signal-to-noise ratio of second harmonic signal at 600 K