Distributed high-precision long-gauge-length carbon fiber strain test device and method

Abstract

The utility model discloses a distributed high-precision long-gauge-length carbon fiber strain test device and a method, and relates to the technical field of health detecting and monitoring in a civil engineering traffic structure. One of long-gauge-length carbon fiber strain sensors is taken as a working piece, the other long-gauge-length carbon fiber strain sensor is taken as a temperature compensating piece; a signal output end of a Wheastone temperature compensating bridge is connected with a signal input end of a primary signal, a signal output end of the primary signal is connected with a signal input end of a singlechip, and a signal output end of the singlechip is connected with a signal input end of a high-credibility approximate truth value. The invention aims at providing the distributed high-precision long-gauge-length carbon fiber strain test device for sensing performance of the comprehensive carbon fiber materials in the small strain range, which realizes the sensing of small strain of structures in large range under the condition of long-term unstable temperature so as to achieve the continuous detecting and monitoring on the stress (strain) of the structure.

Description

[0001] technical field [0002] The invention relates to the technical field of health detection and monitoring for civil traffic structures, in particular to the technical field of distributed high-precision long-gauge carbon fiber strain testing devices with carbon fiber as the base material. [0003] Background technique [0004] In the structural health monitoring system, the long-term static stress (strain) monitoring and the detection of the dynamic response of the structure after excitation are important methods for evaluating the long-term performance of the structure and identifying damage. In practical applications, on the one hand, sensors with high sensitivity in the small strain excitation range are easily affected by noise and changes in environmental conditions, resulting in the monitoring system not being able to correctly respond to changes in the parameters of the structure itself; on the other hand, the traditional 'point' type The strain gauge is often d...

AI Technical Summary

Problems solved by technology

In addition, because the resistivity of carbon fiber is small and the initial value of resistance is small, the output signal is relatively small when tested in a small strain range.

In the actual measurement through the common resistance test method, the output signal does not display a value stably due to the limitation of the test conditions, and the sampling deviation is seriously scattered.

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