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Method for raising signal to noise ratio of piezoelectric electret film sensor

A piezoelectric electret and thin-film sensor technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve complex processes and signal distortion , restricted use and other issues, to achieve the effect of improving signal-to-noise ratio, reducing noise interference, and improving work efficiency

Active Publication Date: 2012-06-27
BEIGU NEW MATERIAL TECH SHANGHAI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, piezoelectric electret film sensors are susceptible to interference from electromagnetic waves, power frequency signals and other noises in the external environment in actual use, resulting in signal distortion
Therefore, it is necessary to shield these interferences, and the traditional method of shielding piezoelectric materials is mainly to use rigid metal shells for shielding, which not only has high cost and complicated process, but also does not match the flexible characteristics of piezoelectric electret film sensors. Greatly limits its use in flexible, curved applications

Method used

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  • Method for raising signal to noise ratio of piezoelectric electret film sensor
  • Method for raising signal to noise ratio of piezoelectric electret film sensor
  • Method for raising signal to noise ratio of piezoelectric electret film sensor

Examples

Experimental program
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Effect test

Embodiment example 1

[0035] Implementation Case 1 [as attached figure 1 ]

[0036] Commercially available conductive double-sided adhesive tape was laminated on the positive electrode surface of the prepared piezoelectric electret film 1 coated with metal electrodes. The piezoelectric electret film 1 with the conductive glue attached to the positive electrode surface is laminated on the commercially available negative electrode surface coated with a metal electrode piezoelectric electret film 2, and the piezoelectric electret film 1 and piezoelectric The electret film 2 sticks together. Then commercially available plastic films 3 and 4 were cold mounted on the negative electrode surface of the piezoelectric electret film 1 and the positive electrode surface of the piezoelectric electret film 2 respectively. The commercially available conductive ink 5 is screen-printed on the outer surface of the plastic film 3 of the piezoelectric electret film assembly, and then the above-mentioned assembly is ...

Embodiment example 2

[0038] Implementation case two [as attached figure 2 ]

[0039] Commercially available conductive double-sided adhesive tape was laminated on the positive electrode surface of the prepared piezoelectric electret film 1 coated with metal electrodes. Fold the commercially available piezoelectric electret film 1 with conductive glue on the positive electrode surface into the positive electrode surface and then laminate it. Then commercially available plastic films 2 and 3 were cold-mounted on the upper and lower negative electrode surfaces of the above-mentioned piezoelectric electret film 1 assembly, respectively. The metal terminals are drawn out to complete the piezoelectric electret film parallel self-shielding laminated sensor.

[0040] A schematic diagram of the comparison of output charges between the parallel stacked sensor 1 and the single-layer sensor 2 is shown in FIG. 5 .

Embodiment example 3

[0041] Implementation case three [as attached image 3 ]

[0042] The commercially available plastic films 2 and 3 are cold mounted on the positive and negative electrode surfaces of the commercially available piezoelectric electret film 1, respectively. The commercially available conductive ink 4 is screen-printed on the outer surface of the plastic film 2 of the piezoelectric electret film assembly, and then the above assembly is placed in an oven for 30 minutes at 100 degrees Celsius and then taken out. Finally, a commercially available plastic film 5 is cold mounted on the upper surface of the conductive ink 4 of the piezoelectric electret film assembly. The metal terminals are drawn out to complete the piezoelectric electret film series and shielded laminated sensor.

[0043] The output schematic diagram of the above-mentioned single-layer sensor with shielding layer is shown in Figure 6;

[0044] The schematic diagram of the output of the single-layer sensor 2 without...

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Abstract

The invention discloses a method for raising a signal to noise ratio of a piezoelectric electret film sensor. A lamination method is employed to carry out series connection or parallel connection lamination on piezoelectric electret films, charge and voltage output quantity of the piezoelectric electret film sensor are raised by times so as to raise the sensitivity of the sensor. Simultaneously, the invention also discloses a screen printing method, and a flexible shielding layer is added to the piezoelectric electret film sensor so as to raise the anti-interference capability of the sensor. According to the invention, operation is simple, energy consumption is low, work efficiency is substantially raised, and under the premise of flexibility, being ultrathin, free bending, random cutting, durability, and a low price, the sensitivity and the anti-interference capability of the sensor are raised. Thus the application of the piezoelectric electret film sensor at a high sensitivity demand occasion and in a strong electromagnetic interference environment is developed, and the sensor caters to a market demand more.

Description

technical field [0001] The invention relates to the technical field of sensors and functional materials, in particular to a method for improving the signal-to-noise ratio of piezoelectric electret film sensors. Background technique [0002] Piezoelectret (also known as ferroelectret Ferroelectret) is a polymer film with a non-polar microporous structure inside, which can exhibit high piezoelectric performance after proper electric polarization treatment. It has received extensive attention in the fields of functional materials and sensors. It not only has the advantages of high sensitivity, light weight and ultra-thin, large-area film formation, low cost and environmental protection, size can be cut at will, and good acoustic matching with air, water, and human body. It has broad application prospects in the fields of sensors and actuators in acoustics and ultrasound, medical and health, control and detection, intelligent transportation, security, consumer electronics, and ...

Claims

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Application Information

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IPC IPC(8): H01L41/26H01L41/45
Inventor 李彦坤孟召龙游琼娄可行张晓青
Owner BEIGU NEW MATERIAL TECH SHANGHAI
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