A modified carbon fiber strain sensor and its preparation method
A technology of fiber strain and sensing devices, which is applied in the field of sensing and self-sensing, can solve problems such as difficult to guarantee linear output, complex coupling response, and unstable output signal, and achieve superior temperature compensation effect, good dynamic response, and high precision Effect
Active Publication Date: 2020-06-16
南京智慧基础设施技术研究院有限公司 +1
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Problems solved by technology
The current problem of carbon fiber sensing technology is: high stress state signal linearity is poor. Carbon fiber sensing materials are mainly composite materials composed of continuous carbon fiber filaments, resins, 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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[0034] according to figure 1 The production process of making 4 gauge lengths respectively is the long gauge carbon fiber strain sensor device of 500 millimeters, and its fabrication method is respectively the former long gauge carbon fiber strain sensor that obtains by original method (CN102494603A), and the present invention The improved long gauge carbon fiber strain sensor manufactured by the above method. Install the four long-gauge carbon fiber strain sensors on the same iron plate, and measure the output signals of the four sensors after stretching the iron plate. The measurement results show that in the range of 1500 microstrain, the output signals of the four sensors all have good linearity, which proves that the four types of long gauge carbon fiber strain sensors all meet the linear output in the small strain range. This conclusion is consistent with the conclusion of the long-gauge carbon fiber strain sensor manufactured by the original method (CN102494603A). The ...
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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...
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IPC IPC(8): G01B7/16
CPCG01B7/18
Inventor 吴智深黄璜方达
Owner 南京智慧基础设施技术研究院有限公司