Hydrogen laser detection based on conjoint analysis of multiple harmonic signals for wavelength modulated spectroscopy
Global energy consumption is increasing.The society has begun to pay more and more attention to hydrogen energy as a type of clean and efficient energy.However,in the event of hydrogen leakage,it is highly likely to cause explosions.This study is based on Tunable Diode Laser Absorption Spectroscopy(TDLAS)technology and establishes a simulation model for hydrogen wave-length modulation.The changes in the amplitude of each harmonic under different modulation coefficients are studied,and formulas for the ratio of the second harmonic to the first harmonic and the ratio of the fourth harmonic to the center amplitude of the second har-monic are derived.The results show that when the modulation coefficients respectively are 2.2 and 4.1,the center frequency ampli-tudes of the second and fourth harmonics reach their maximum values.The second harmonic method can eliminate the influence of light intensity and achieve self calibration of optical power compared to the first harmonic method;The method of fourth harmonic to second harmonic is only related to the modulation coefficient and is independent of concentration and temperature.By analyzing the ratio function,the modulation coefficient is relatively close to the value of each harmonic's ideal modulation coefficient,resulting in the best signal-to-noise ratio of the harmonic signal and improving detection accuracy.This provides certain reference value for im-proving hydrogen laser detection methods.
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