METHOD AND DEVICE FOR TURNING OF POLARIZATION PLANE OF ULTRASONIC WAVE Russian patent published in 1998 - IPC

FIELD: acoustoelectronics and ultrasonic engineering. SUBSTANCE: in controlled acoustic line made of nonpolarized ferroelectric ceramics with abnormally high value of dielectric permettivity, linearly polarized ultrasonic wave with frequency ω₀ in the form of bundle formed by converter interacts with electric field rotating round the direction of its propagation with field rotation velocity Ω close to ω₀. Two circularly polarized ultrasonic waves, formed due to the interaction, propagate with different phase velocities owing to this, formed at outlet of acoustic line is linearly polarized ultrasonic wave whose plane of polarization is turned through angle whose value is proportional to ω40

, intensity E₀, ratios ω₀, Ω and parameters of ferroelectric ceramics and sound line. Rotating field is formed with the help of mutually perpendicular couples of flat electrodes which are supplied with alternating voltage with frequency Ω and with phase shift π/2.. Angle of turn is controlled by generator of ultrasonic frequencies. EFFECT: extended dynamic range of working frequencies and possibility of control of turning of polarization plane of ultrasonic wave. 2 cl, 3 dwg