RU2005104863A - METHOD AND DEVICE FOR TRANSFORMING ULTRASONIC WAVE - Google Patents

Claims (2)

1. The method of converting an ultrasonic wave, which consists in the action of a rotating electric field transverse to the direction of propagation of the ultrasonic wave, on non-polarized ferroceramics with an anomalously high dielectric constant when an acoustic wave propagates in it, characterized in that the rotation frequency and intensity of the rotating electric field are set in accordance with equality

and the electric field must exceed a threshold value E ₀ > E _then wherein

where Ω is the frequency of rotation of the electric field; ω ₀ is the frequency of the ultrasonic wave; E _pore is the threshold value of the intensity of a rotating electric field; η ₄₄ is a component of the viscosity tensor; α ₁₄₄ , α ₁₅₅ , are the tensor components that take into account the electrostrictive effect of the field E on the elastic constant of the medium; β ₁₄₄ , β ₁₅₅ are tensor components that take into account the electrostrictive effect of field E on the viscosity of the medium. 2. Device for converting an ultrasonic wave, containing a controlled sound guide made of non-polarized ferroceramics with an anomalously high dielectric constant, on which are placed electrically isolated pairs of electrodes and a shear wave transducer, phase shifter, ultrasonic frequency alternating voltage generator, the output of which is connected with the input of the phase shifter and one pair of electrodes, and the output of the phase shifter is connected to other pairs of elec childbirth, characterized in that the controlled sound pipe has a length corresponding to the calculation formula

where L _s is the length of the controlled sound pipe; ζ ₁ and ζ _{2 are} arguments of complex ellipticities; the parameter s takes values from the set of integers; k ₁ and k ₂ are the wave numbers of the eigenmodes of the acoustic field; ω ₀ is the frequency of the ultrasonic wave;  Ω is the frequency of rotation of the electric field.