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Circular truncated cone-shaped polyvinylidene fluoride (PVDF) ultrasonic transmitter

An ultrasonic and transmitter technology, applied in the field of ultrasonic transmitters, can solve problems such as small beam angles, and achieve the effects of wide frequency bandwidth, large emission energy, and good coupling

Pending Publication Date: 2018-07-10
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that one disadvantage of the cylindrical PVDF ultrasonic sensor is that the beam angle in the vertical direction is small

Method used

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  • Circular truncated cone-shaped polyvinylidene fluoride (PVDF) ultrasonic transmitter
  • Circular truncated cone-shaped polyvinylidene fluoride (PVDF) ultrasonic transmitter
  • Circular truncated cone-shaped polyvinylidene fluoride (PVDF) ultrasonic transmitter

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Embodiment Construction

[0022] Two parts of partially annular PVDF piezoelectric film 1 with the same structural characteristics form a frustum of a cone; specifically, two identical partially annular PVDF piezoelectric films can be welded along the radial edge;

[0023] In the present invention, in the two-part annular PVDF piezoelectric film, the length of the chord to the outer arc is greater than the length of the tangent of the inner arc, which satisfies cos(α / 2)>l / L, where α is The radian value of the fan angle, l is the radius of the inner arc, and L is the radius of the outer arc.

[0024] The surface electrodes of the piezoelectric thin film of the present invention are plated with aluminum or silver, and the electrodes are led out from the wire through the bottom end of the thin film.

[0025] The relationship between the angle δ between the edge of the emission direction of the ultrasonic wave of the present invention and the top surface of the cone and the bottom angle θ of the cone is: δ...

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PUM

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Abstract

The invention relates to a circular truncated cone-shaped polyvinylidene fluoride (PVDF) ultrasonic transmitter, and belongs to the field of ultrasonic transmitters. A circular truncated cone shape isdefined by means of two parts of circular ring-shaped PVDF piezoelectric films 1 having the same structural characteristics; the resonant frequency and ultrasonic emission angle of a sensor can be adjusted by changing the parameters such as circular truncated cone height, the top surface radius and bottom surface radius. The PVDF ultrasonic transmitter has the advantages of being wide in bandwidth, having a horizontal wave beam angle of 360 degrees and a vertical wave beam angle of not less than 160 degrees, and the like. The PVDF ultrasonic transmitter is suitable for the fields such as three-dimensional ultrasonic positioning, ultrasonic ranging, robot obstacle avoiding, handwriting input and liquid level measurement.

Description

technical field [0001] The invention relates to the field of ultrasonic transmitters, in particular to an ultrasonic transmitter made of PVDF piezoelectric film and applied in air. Background technique [0002] Advances in materials science have enabled low-cost production and fabrication of sensors. Polyvinylidene fluoride (PVDF) is an electroactive polymer that has piezoelectric properties at room temperature and is used to sense temperature, pressure, velocity, and acceleration, among others. It is a ferroelectric polymer with unique properties, widely used in the fields of medicine and bioimaging. At the same time, PVDF has good acoustic impedance matching with air, and is suitable for generating ultrasonic waves in air. [0003] PVDF ultrasonic transmitter is a device that utilizes the vibration of PVDF piezoelectric film driven by alternating current to radiate sound. Its common structure is composed of PVDF piezoelectric film and external structure made by imposing ...

Claims

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Application Information

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IPC IPC(8): B06B1/06
CPCB06B1/0688
Inventor 陈建赵静仪孙晓颖燕学智林琳王庆龙孙铭会
Owner JILIN UNIV
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