Open AccessExperimental research on the sensitivity of wavelength modulation by signal processing
Author(s) -
Jie Shao,
Xiaoming Gao,
Yuncong Yuan,
Yang Yong,
Cao Zhen-Song,
Pei Shi-Xin,
Weijun Zhang
Publication year - 2005
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.54.4638
Subject(s) - modulation (music) , signal processing , sensitivity (control systems) , signal (programming language) , spectrometer , digital signal processing , optics , wavelength , tunable diode laser absorption spectroscopy , noise (video) , computer science , laser , multidimensional signal processing , signal to noise ratio (imaging) , materials science , tunable laser , electronic engineering , physics , acoustics , artificial intelligence , engineering , image (mathematics) , programming language , computer hardware
We present a signal-processing system developed for enhancing the sensitivity of absorption measurement based on tunable diode laser wavelength modulation spectroscopy. A signal-to-noise ratio enhancement of an order of magnitude was observed when digital signal-processing algorithms were applied to wavelength modulation spectrometers in the near-infraredat the same time a new spectra was found by observation of CO2 near 1.53 μm. These algorithms include digital low-pass filters, multiple averages, and a least squares fit. Digital signal processing has a practical advantage over other noise suppression techniques because it is easy to implement and adapt able to all experiments.