Abstract
A method is proposed that employs the ratios of the 2nd and 4th harmonics at the line center to measure line width under high absorption. The measured line width is then applied in the “calibration-free 2f/1f” formula to detect gas pressure and concentration. To verify this method, the transitions of CO2 at 6,982.0678 cm−1 and H2O at 6,979.2995 cm−1 are selected to measure the line width, gas pressure, and concentration in laboratory and field environments, respectively. Experimental results are very consistent with the expectations.
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This work was supported by the National Natural Science Foundation of China under Grant Nos. 51206086 and 51176085.
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Lan, L.J., Ding, Y.J., Peng, Z.M. et al. Calibration-free wavelength modulation for gas sensing in tunable diode laser absorption spectroscopy. Appl. Phys. B 117, 1211–1219 (2014). https://doi.org/10.1007/s00340-014-5945-4
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DOI: https://doi.org/10.1007/s00340-014-5945-4