Structural health monitoring (SHM) is a vastly growing field consisting of sensors embedded in or attached with the structure which respond to the strain or other stimuli to monitor the deformation in real-time. In this study, a carbon fiber (CF) sensor was developed using unidirectional Polyacrylonitrile (PAN) carbon filaments aligned straightly together and its sensitivity was calculated experimentally, with the gauge factor (GF) in 10.2–10.8 range. The electro-thermal behavior of this CF sensor showed distinct performance and detected the change in the surrounding temperature. There is a good reproducibility in the results in both piezoresistive and electro-thermal behavior of the CF sensor and its electrical performance showed real-time detection of both mechanical and thermal stimuli. The results established that the CF exhibited good potential as a flexible strain sensor for in-situ monitoring of damage or energy release during the failure of composites.

结构健康监测（SHM）是一个发展迅速的领域，由嵌入或附着在结构中的传感器组成，这些传感器响应应变或其他刺激以实时监测变形。在这项研究中，开发了一种碳纤维（CF）传感器，该传感器使用直接排列在一起的单向聚丙烯腈（PAN）碳丝，并通过实验计算了其灵敏度，其规格系数（GF）在10.2-10.8范围内。该CF传感器的电热行为表现出独特的性能，并检测到周围温度的变化。CF传感器的压阻和电热行为的结果具有良好的可重复性，并且其电性能显示了机械和热刺激的实时检测。