TY - GEN
T1 - Multiple harmonics extraction of wavelength modulated laser spectrum by single step empirical mode decomposition
AU - Li, Hongyao
AU - Xu, Lijun
AU - Cao, Zhang
N1 - Publisher Copyright:
© 2025 IEEE.
PY - 2025
Y1 - 2025
N2 - Wavelength modulation spectroscopy (WMS) is a noise immune method for gas detection in Tunable diode laser absorption spectroscopy (TDLAS). Harmonic extraction is the key to obtain the normalized harmonics in WMS. A harmonic extraction method is proposed in this work by using a single step empirical mode decomposition (SS-EMD). And simultaneous extractions of multiple complete harmonics are realized by using only the raw WMS signals once. An analytic expression for the WMS signal is derived from only a small number of raw laser intensities. Both simulation and experiment results are used to validate the noise immunity of the proposed method, and performance comparisons with the lock-in amplification (LIA) method are also made. Complete and accurate multi-harmonics extraction of SS-EMD requires only one fourth of sampled laser intensity points compared to LIA, and the difference of signal to noise ratio between these two methods is less than 2.4%.
AB - Wavelength modulation spectroscopy (WMS) is a noise immune method for gas detection in Tunable diode laser absorption spectroscopy (TDLAS). Harmonic extraction is the key to obtain the normalized harmonics in WMS. A harmonic extraction method is proposed in this work by using a single step empirical mode decomposition (SS-EMD). And simultaneous extractions of multiple complete harmonics are realized by using only the raw WMS signals once. An analytic expression for the WMS signal is derived from only a small number of raw laser intensities. Both simulation and experiment results are used to validate the noise immunity of the proposed method, and performance comparisons with the lock-in amplification (LIA) method are also made. Complete and accurate multi-harmonics extraction of SS-EMD requires only one fourth of sampled laser intensity points compared to LIA, and the difference of signal to noise ratio between these two methods is less than 2.4%.
KW - multiple harmonics extraction
KW - single step empirical mode decomposition
KW - wavelength modulation spectroscopy
UR - https://www.scopus.com/pages/publications/105012198055
U2 - 10.1109/I2MTC62753.2025.11079019
DO - 10.1109/I2MTC62753.2025.11079019
M3 - 会议稿件
AN - SCOPUS:105012198055
T3 - Conference Record - IEEE Instrumentation and Measurement Technology Conference
BT - IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2025 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2025 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2025
Y2 - 19 May 2025 through 22 May 2025
ER -