An Integrated Monitoring System for Damage Detection by Carbon Fibers and Optical Fibers

摘要

An integrated real-time continuous monitoring system is proposed with twotypes of sensors to detect damage through global and local monitoring ofstructures in this paper. This method combines a fast-response andeasy-to-operate carbon fiber (CF) sensor and an optical fiber (OF) sensor withlong-distance monitoring capacity and high spatial resolution. The distributedCF sensor monitoring system can undertake global and local monitoring, and theOF sensor monitoring system with a long sensing distance can monitorfull-scale and local strain response. The measured signals of the CF and OFsensors include the strain response, the external condition response and themonitoring system noise. Towards the measuring capability in detectinglow-level strain, the static measured signal of CF and OF sensor in a variableexternal condition is compared. Based on the relationship between sensingperformance and monitoring numbers, a similar true value analysis method wasdeveloped from the measured signal, and then a wavelet transform basedde-noising method was also developed. The effective high-confidence integratedmonitoring system of CF and OF sensors is established and discussed along withthe similar true value and the de-noised signal. Finally, this integrated systemwas installed on a concrete beam to determine its damage detection capability. Itis found experimentally that the integrated monitoring with CF and OF sensorsachieved high-confidence signals in detecting the damage location.