A study on the detection of weak photoacoustic signals by stochastic resonance.
On the basis of stochastic resonance (SR) theory a study of the detection of photoacoustic (PA) signals without a lock-in amplifier is presented. The applicability of the SR method is investigated both with simulated signals calculated by use of a Gaussian model and with experimental PA signals. Signal-to-noise ratio (SNR) is improved substantially by adjusting the properties of a non-linear system to realize SR. By use of this method the lock-in amplifier can be removed from a PA spectrometer.
Song
H
H
Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, PR China.
Shao
X
X
Su
Q
Q