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Flexible conductive polymer composite-based strain sensor hysteresis compensation method

A strain sensor, flexible conductive technology, applied in the direction of instruments, measuring devices, etc., can solve the problems of unsatisfactory test requirements, hysteresis of sensor measurement results, etc., and achieve the effect of facilitating data processing and application, reducing computational complexity, and improving accuracy

Inactive Publication Date: 2019-01-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current strain sensors based on flexible conductive polymer composite materials cannot meet people's demand for device accuracy at the same time. In the case of general deformation, the measurement results of the sensor have hysteresis.
For example, the flexible strain sensor based on carbon black / polyurethane composite material has a hysteresis of 36.4% when the test deformation is ≤100%, which is far from meeting the test requirements.

Method used

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  • Flexible conductive polymer composite-based strain sensor hysteresis compensation method
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  • Flexible conductive polymer composite-based strain sensor hysteresis compensation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Input and output characteristics of flexible strain sensor based on carbon black / polyurethane composite

[0037] The electronic universal material testing machine (model WDW-05), a resistance of 2 kiloohms divider resistor, a DC voltage source, and a computer form a measuring circuit for the sensor to perform tensile testing on the film, such as figure 1 Shown. Stretch the sensor to 50% strain for 5 minutes, use the data acquisition card and LABVIEW software to collect the sensor input tension and output resistance data, and filter the noise through a median filter of n=4, such as figure 2 As shown, the signal-to-noise ratio gain is 42.07. The actual effective length of the film during stretching is 10 mm, and the stretching speed is 10 mm / min. At 0 ~ The response curve under 100% strain is like image 3 As shown, the root mean square error of the sensor output at this time is 16.337;

[0038] (2) Using the asymmetric envelope function PI operator to construct a hyst...

Embodiment 2

[0054] The difference between this embodiment and embodiment 1 is that the parameter n of the median filter in step (1) is 2, and the signal-to-noise ratio gain of the signal after the noise is removed is 40.87, such as Image 6 Shown.

Embodiment 3

[0056] The difference between this embodiment and embodiment 1 is that the parameter n of the median filter in step (1) is 6, and the signal-to-noise ratio gain of the signal after the noise is removed is 42.19, such as Figure 7 Shown.

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Abstract

The invention discloses a flexible conductive polymer composite-based strain sensor hysteresis compensation method. The method mainly comprises the steps that strain sensor input and output characteristics are measured; a flexible conductive polymer composite-based strain sensor hysteresis model is built by combining asymmetric envelop function PI operators; a flexible conductive polymer composite-based strain sensor hysteresis inverse model is derived; and the inverse model is arranged in front to achieve feedforward compensation on flexible conductive polymer composite-based strain sensor hysteresis. The method has the advantages of being simple in computing and precise in compensation.

Description

Technical field [0001] The post-processing field of the strain sensor of the present invention particularly relates to a method for compensating the hysteresis phenomenon of the strain sensor based on the flexible conductive polymer composite material in the use process based on the asymmetric envelope function Prandtl-Ishlinskii (PI) model with simple calculation and accurate compensation . Background technique [0002] In recent years, strain sensors have become a research hotspot at home and abroad because of their great potential in applications such as rehabilitation and personal health monitoring, structural health monitoring, sports performance monitoring, and human motion capture in entertainment systems (games, animations, etc.). Especially in biomechanics, physiology, kinesiology applications, strain sensors should have excellent stretchability and sensitivity. [0003] However, the current strain sensors based on flexible conductive polymer composite materials cannot me...

Claims

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Application Information

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IPC IPC(8): G01B21/32
CPCG01B21/32
Inventor 陈鹏刘强
Owner TIANJIN UNIV