Transducer based on 2-2 type piezoelectric composite material covering matching layer and preparation method thereof

[0022] Example one

[0023] Refer figure 2 , image 3 As shown, the present invention is a bandwidth that broaden the high-frequency substantial, and selects a different polymer to be widely width for the piezoelectric material sensitive element, and the surface of the piezoelectric composite surface is formed, and the maximum frequency bandwidth is achieved. Expand.

[0024] This embodiment provides a method of preparing a transducer based on a 2-2 piezoelectric composite covering matching layer, including

[0025] Step S1: Cut the piezoelectric phase, pouring the epoxy polymer phase surface with the cutting piezoelectric phase surface and polished, plated on the electrode, welding leads on the electrode to form a 2-2 composite material;

[0026] Step S2: The matching layer is perfused on the 2-2 composite radiant surface, and the sound back liner is pasted on the non-radiating surface of the 2-2 composite material to obtain a vibrator; in the present embodiment, the backing is 25mm * 2.5mm. Glass microbead material;

[0027] Step S3: Mount the vibrator into the housing, perfuse the waterproof radiograph layer in the outer casing and access the cable to obtain the transducer, and the voltage response and sensitivity response curve are used to study the cover matching layer pair of transducer bandwidth The effect; in this example, the outer casing is a cylindrical metal casing having a diameter of 34 mm, an outer height 50 mm, a height 10 mm, and ensures that the polyurethane sound synthesion of the perfused on the radiant surface is close to 4 mm.

[0028] Example 2

[0029] The resonant frequency is close to the oscillator of the 1 MHz strip layer into a transducer. First, the glass microbeads of 25 mm * 2.5 mm are pasted in the non-radiating surface of the vibrator as the backing, and the cylindrical shape is fixed to the cylindrical metal housing by double-sided adhesive. The metal casing has a diameter of 34mm, the outer height is 50mm, and the internal height is 10mm, ensuring that the thickness of the polyurethane sound layer on the radiant surface is close to 4 mm; the transmission voltage response and sensitivity response curve are studied to cover the transducer bandwidth. Influence. figure 1 , Figure 4 , Figure 5 The result curve indicates that the transmission voltage response -3db of the transducer is achieved when the matching layer thickness is selected, and the bandwidth can reach 400 kHz. The transmission voltage in the frequency band is less than 3 dB. This concluded that the thickness of the matching layer was optimally selected. In fact, the present invention can achieve good results when the thickness of the matching layer is 1/4 wavelength ± 0.01 mm.