A.D. Usanov

Alternating and constant magnetic field joint effect on acoustic resonance frequency was investigated. Measurements were taken at the constant environment temperature. Metering circuit was tuned to maximum sensitivity. To avoid nonlinear effect and water heating with the ultrasonic sound the generator signal amplitude did not exceed 30 mV. During measurements a specially crafted copper cylindrical resonator was used. One of the plane surfaces of the cylinder was manufactured as a thin brass membrane, to which a piezoceramics with its own resonance frequency f0 500 kHz was attached. To explore the effect of water purity degree on the measurement results the resonator was filled with either bi-distillated or common tap water. In both cases the results differed within a value less than measurement error. It was shown that the impact of low-frequency alternating magnetic field (AMF) along with constant magnetic field (CMF) on water leads to ultrasonic sound propagation speed decrease in comparison to the case when only AMF (without any constant component) was applied. Therewith after the termination of AMF action the recovery of initial speed value is slower when CMF is additionally applied than when CMF is not applied. It was ascertained that the maximum changes of acoustic resonator resonance frequency at the fixed CMF value (25mTl) de-crease with the environment temperature increase. With the growth of CMF induction the acoustic resonator frequency changes are observed on a wider frequency range as compared to CMF absence.