title: Measurement of weak transmittances by stochastic resonance.
abstract: We use stochastic resonance to measure weak transmittance amplitudes that are below the instrumental detection limit. Gaussian noise is added to the subthreshold (chopped) transmittance signal T(t) before detection by a crossing detector that uses a dc reference signal B>0. Without noise, no measurement is possible because T(t)<B. A fourfold improvement has been obtained in the detection limit, permitting the measurement of amplitudes that are as small as 0.25B.
authors: A
authors: A
authors: Palonpon
authors: J
authors: J
authors: Amistoso
authors: J
authors: J
authors: Holdsworth
authors: W
authors: W
authors: Garcia
authors: C
authors: C
authors: Saloma