Long-gauge length carbon fiber strain sensing device and method for testing same

Abstract

The invention discloses a long-gauge length carbon fiber strain sensing device. The long-gauge length carbon fiber strain sensing device comprises two groups of long-gauge length carbon fiber strain sensing elements with the same geometric size, three isolation film layers with the same size, a measurement connector, two anchoring sections and two parallel connectors, wherein one ends of the long-gauge length carbon fiber strain sensing elements are connected with the parallel connectors through electrodes respectively, the other ends of the long-gauge length carbon fiber strain sensing elements are connected with the measurement connector in series, and the two groups of long-gauge length carbon fiber strain sensing elements are located between adjacent isolation films respectively and have the same strain sensitivity coefficient and the same thermosensitivity coefficient. The long-gauge length carbon fiber strain sensing device achieves sensing of micro structural strain within a large range under long-term instable temperature and humidity conditions to meet civil engineering structural stress (strain) continuous detection and monitoring requirements.

Description

technical field

[0001] The invention relates to a technology for health detection and monitoring in civil traffic structures, in particular to a long-gauge carbon fiber strain sensing device suitable for long-term monitoring and distributed strain sensing and a testing method thereof. Background technique

[0002] 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, the unstable working environment (corrosion, high temperature) on site has great interference to the normal use of the sensor, often leading to detection errors. At this time, a stable sensor that can monitor in a wide range is particularly important. Carbon fiber is a high-strength, corrosion-resistant structural material that also has force-resistance properties. As a...

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