Flexible piezoelectric transducer and system
A flexible piezoelectric and transducer technology, applied in the field of acoustics, can solve the problems of poor energy superposition, limitations of miniaturization and integration, and short distance maintained in the propagation direction, achieve focused acoustic vortex stabilization, and improve equipment integration. The effect of superposition and enhancement of power and energy
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[0039] Example 1
[0040] In order to break through the problems of complex structure and difficult miniaturization of piezoelectric transducer arrays that generate acoustic vortex wave velocity, this embodiment abandons the structure of array piezoelectric transducers, and creatively proposes a flexible substrate and flexible piezoelectric transducers. The thin-film non-array flexible piezoelectric transducer provides an effective way to solve the problem to be solved by the present invention.
[0041] figure 2 It is a schematic structural diagram of the flexible piezoelectric transducer provided in this embodiment. like figure 2 As shown, in this embodiment, a flexible PVDF piezoelectric film is coated on a flexible substrate, and the flexible substrate is made of a material with strong deformation resistance and ductility, preferably: ethylene phthalate (PET) , Polycarbonate (PC) or Polyimide (PI). Specifically, the flexible piezoelectric transducer includes: a flexib...
Example
[0056] example 1:
[0057] When there are multiple isometric spiral electrode strips, taking four spiral arms as an example, the initial inner diameter a 1 =13.8mm, initial outer diameter a 2 =14.85mm, the azimuth angle coefficients corresponding to the helical electrodes with topological charge numbers l of 1, 2, 3 and 4 are respectively b 1 =0.0225, b 2 =0.0451, b 3 =0.0676, b 4 = 0.0902, the termination angles of the azimuth are θ 1 =12π, θ 2 =6π, θ 3 =4π, θ 4 =3π. At this time, the minimum width of the equiangular spiral electrode strip is d min =1mm, the maximum width of the equiangular spiral electrode strip is d max = 2.47mm, after applying the sinusoidal excitation signal of the same frequency and phase, it can generate vortex sound waves of 305kHz to 750kHz.
Example
[0058] Example 2:
[0059] When the equiangular spiral electrode strip is a single strip, the initial inner diameter is 13.8mm, the initial outer diameter is 14.85mm, the azimuth angle coefficient b=0.0225, the azimuth angle θ rotates from 0 to 12π, and 425kHz can be generated after the sinusoidal excitation signal is applied. vortex sound waves.
[0060] Both flexible substrates and PVDF piezoelectric films can bend under different conditions. see Figure 4 , which shows the deformation diagram of the flexible piezoelectric transducer under different stress conditions. Figure 5 The zoom spot depth of the flexible substrate and the PVDF piezoelectric film under stress, bending and extension changes is shown. The flexible substrate provided with the PVDF piezoelectric film is concave spherical in the use state. The flexible substrate changes the radius of curvature through bending deformation, thereby realizing the depth of the zoom spot. Figure 5 R in SR is the curvatur...
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