Affiliation:
1. Anqing Normal University
2. Fudan University
3. West Anhui University
Abstract
The parameter-tuning stochastic resonance (SR) method can convert part of the noise energy into the signal energy to suppress the noise and amplify the signal, comparing with traditional weak periodic signal detection methods (e.g., time average method, filtering method, and correlation analysis method). In this work, the numerical calculation is conducted to find the optimal resonance parameters for applying the SR method to the wavelength modulation spectroscopy (WMS). Under the stochastic resonance state, the peak value of 2f signal (a constant concentration of CH4∼20 ppm) is effectively amplified to ∼0.0863 V, which is 3.8 times as much as the peak value of 4000-time average signal (∼0.0231 V). Although the standard deviation also increases from ∼0.0015 V(1σ) to ∼0.003 V(1σ), the SNR can be improved by 1.83 times (from ∼25.9 to ∼15.8) correspondingly. A linear spectral response of SR 2f signal peak value to raw 2f signal peak value is obtained. It suggests that the SR method is effective for enhancing photoelectric signal under strong noise background.
Funder
Natural Science Foundation of Anhui Province
National Natural Science Foundation of China
Natural Science Foundation of State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines
Research Foundation of the Institute of Environment-friendly Materials and Occupational Health of Anhui University of Science and Technology
Research Foundation of Anhui Key Laboratory of Mine Intelligent Equipment and Technology
Subject
Atomic and Molecular Physics, and Optics