Modified carbon fiber strain sensor device and preparation method thereof

Abstract

The invention relates to the technical field of sensing and self-sensing and particularly relates to a modified carbon fiber strain sensor device and a preparation method thereof. The device includesa modified carbon fiber strain sensing core wire and a foil signal demodulation component. The preparation method comprises the following steps of placing a carbon fiber bundle in a pre-tensioning environment within 300-1000 mu epsilon, applying pre-impregnation linearizing processing on the carbon fiber bundle, applying secondary high-stress tension to the linearized carbon fiber bundle for preliminary molding, performing later maintenance on the initially molded carbon fiber bundle until complete formation, and installing a foil-type signal demodulation component printed by a flexible circuit board to obtain the modified carbon fiber sensing core wire. The invention has the characteristics of superior use performance, high precision, good dynamic response and stable measurement performance and is suitable for a continuous monitoring project in a harsh environment.

Description

technical field [0001] The invention relates to the technical field of sensing and self-sensing, in particular to a modified carbon fiber strain sensing device and a preparation method thereof. Background technique [0002] Strain is one of the most sensitive structural parameters to structural damage. At present, strain sensing technology has been widely concerned in the structural detection and monitoring technology of civil traffic engineering structures. In the process of structural detection and monitoring, engineers have begun to use electronic, optical fiber and other strain sensors in order to qualitatively and quantitatively analyze and evaluate structural performance. Under normal circumstances, the degradation process of civil engineering structures is very slow, but in harsh environments or under the action of special external forces, the degradation will be accelerated and damage will result in reduced structural performance. Therefore, for a strain sensor with...

AI Technical Summary

Problems solved by technology

At present, the problem of carbon fiber sensing technology is: the differential signal linear carbon fiber sensing material under high stress state is mainly a composite material composed of continuous carbon fiber filaments, resin, and electrodes.

The coupling response between the constituent materials is complex, which can easily lead to unstable output signals, especially in high stress states where it is difficult to guarantee linear output

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