Long-scale-distance carbon fiber strain sensor

Abstract

The invention discloses a long-scale-distance carbon fiber strain sensor which comprises a long-scale-distance carbon fiber strain sensor core wire, an anchorage section and a packaging layer. The two ends of the long-scale-distance carbon fiber strain sensor core wire are fixed to the anchorage section and packaged into the packaging layer in an insulating mode. The long-scale-distance carbon fiber strain sensor core wire is provided with a notch enabling the section of the long-scale-distance carbon fiber strain sensor core wire to be reduced in the fiber direction of the long-scale-distance carbon fiber strain sensor core wire, and the notch is the inner notch penetrating through the interior of the long-scale-distance carbon fiber strain sensor core wire or the outer notch formed in the outer surface of the long-scale-distance carbon fiber strain sensor core wire. The area of the notch is 0.5-5 percent that of the long-scale-distance carbon fiber strain sensor core wire. Long-term monitoring on small strain variation by the long-scale-distance carbon fiber strain sensor core wire is achieved, the long-scale-distance carbon fiber strain sensor has a sensing substrate and a packaging material which have the stable chemical quality, the measuring requirement for the small strain variation in long-term monitoring is met, and the precision of the sensor is improved.

Description

technical field [0001] The invention relates to a strain sensor device used for health detection and monitoring in civil traffic engineering structures, in particular to a dynamic and static high-precision distributed long-gauge distance carbon fiber strain sensor device that meets the measurement requirements of small strain changes. Background technique [0002] In the structural health detection and monitoring system of civil traffic engineering structures, the stress (strain) change of the structure is an important index used to evaluate the long-term performance of the structure and identify damage. A strain sensor is a test instrument that converts the stress change of the measurement object into a measurable signal. Commonly used strain sensors mainly include point-type resistance strain gauges based on electronic sensing. In practical applications, due to the wide coverage of the structure and the large number of monitoring nodes, it often leads to the problem of hi...

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Problems solved by technology

[0004] However, the carbon fiber sensing core wire itself is a composite material formed by impregnating and curing thousands of microfibers with resin. Due to the influence of the manufacturing process, the formed carbon fiber sensing core wire has discrete problems in the small strain range, which cannot meet the requirements of 10 microfibers. Small strain measurement requirements within strain

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