Abstract
A novel method of gas concentration calibration for tunable diode laser absorption spectroscopy, in which spectral analysis and harmonic signal intensity ratio measurement are combined, is proposed in this study. A harmonic signal is extracted from a transmitted light intensity by spectral analysis. The ratio of the second harmonic to the first harmonic is proportional to the gas concentration. The noise caused by electronics and environment is filtered out via frequency-domain filtering, and the harmonic ratio measurement eliminates the effects of light intensity fluctuations. The accuracy and effectiveness of the proposed method are verified by simulation and experiment. Experimental results show that the relative error of measurement is less than 3% and the correlation coefficient between measurement and calibration line is 0.9991.
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