A kind of preparation method of locally polarized piezoelectric film sensor
A piezoelectric film and sensor technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve the problem that piezoelectric sensors cannot meet the application requirements of aircraft and other problems to achieve the effect of facilitating integration, reducing weight, and eliminating problems
Inactive Publication Date: 2016-06-01
BEIHANG UNIV
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[0004] In order to solve the problem that the existing piezoelectric sensors cannot meet the application requirements of aircraft, the present invention provides a new method for preparing a locally polarized piezoelectric film sensor
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[0018] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.
[0019] Such as figure 1 As shown, the preparation method of the locally polarized piezoelectric film sensor provided by the present invention mainly includes the preparation of the piezoelectric film, the local polarization of the piezoelectric film and the packaging of the piezoelectric film sensor.
[0020] Such as figure 2 As shown, the present invention adopts casting method to prepare piezoelectric film, including steps 1.1 to 1.4. The film preparation materials are PZT (lead zirconate titanate) powder and PVDF (polyvinylidene fluoride) powder, wherein the particle size of PZT is about 3 μm, and the particle size of PVDF is about 5 μm.
[0021] Step 1.1, mix PZT powder and PVDF powder at a volume ratio of 1:1, dissolve in NMP (N-methylpyrrolidone);
[0022] Step 1.2, using a magnetic stirrer, the mixture was stirred at 80°C for 60 minutes to ...
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The invention provides a preparation method for a locally polarized piezoelectric film sensor, which belongs to the technical field of structural health monitoring. This method first prepares a PZT / PVDF piezoelectric film, then locally polarizes the piezoelectric film, and finally encapsulates the piezoelectric film sensor. In local polarization, the piezoelectric film is uniaxially stretched first, and then an electrode array is coated on the piezoelectric film. Each electrode is obtained by coating silver films on both sides of the piezoelectric film, and then using oil The bath polarization method performs polarization, and only applies an electric field to each electrode during polarization. The preparation method provided by the invention can reduce the weight of the sensor without changing the aerodynamic shape of the aircraft itself, eliminate the problems of manual pasting and wire arrangement, and facilitate integration with the base body.
Description
technical field [0001] The invention relates to a preparation method of a locally polarized piezoelectric film sensor, belonging to the technical field of structural health monitoring. Background technique [0002] A Lamb wave is an elastic wave formed by the mutual coupling of a transverse wave and a longitudinal wave in a structure with two parallel surfaces (such as a plate). Lamb wave has good guided wave characteristics and is sensitive to tiny damage. The damage monitoring method based on active Lamb waves is a very effective monitoring method in structural health monitoring. When the Lamb wave propagates in the structure, various damages inside the structure will cause stress concentration and crack expansion, which will cause the scattering and energy absorption of the Lamb wave signal propagating in the structure. By arranging the sensor array near the damage, the receiving After analyzing and processing the Lamb wave signal, the damage characteristic parameters c...
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IPC IPC(8): H01L41/22H01L41/257H01L41/23H10N30/01H10N30/02H10N30/045
Inventor 王自力张宇隆张卫方王畏寒方小亮张慰阳劲松刘天娇
Owner BEIHANG UNIV