Miniature fiber optic temperature sensor for concrete structural health monitoring

Xiaotian Zou; Alice Chao; Nan Wu; Ye Tian; Tzu-Yang Yu; Xingwei Wang

doi:10.1117/12.915265

6 April 2012 Miniature fiber optic temperature sensor for concrete structural health monitoring

Xiaotian Zou, Alice Chao, Nan Wu, Ye Tian, Tzu-Yang Yu, Xingwei Wang

Proceedings Volume 8345, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012; 83454V (2012) https://doi.org/10.1117/12.915265
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2012, San Diego, California, United States

Abstract

This paper presents a miniature fiber optic temperature sensor and its application in concrete structural health monitoring. The temperature sensor is based on Fabry-Perot (FP) principle. The endface of the fiber was wet etched. A piece of borosilicate glass was thermally deposited into the cavity on the etched endface to form an FP cavity. Temperature calibration experiments were performed. A sensor with 30 μm microcavity length was demonstrated to have a sensitivity of 0.006 nm/°C and linearity coefficient of 0.99. During the early-age of concreting, the sensor was embedded in the concrete structure to monitor the temperature change caused by the exothermic chemical reaction between the cement and water. The dramatically increased temperature inside the structure was directly related to its future structural health. During the concrete hydration experiment, the measured peak temperature of concrete specimens was 59.7 °C 12.5 hour after concrete casting.

Citation Download Citation

Xiaotian Zou, Alice Chao, Nan Wu, Ye Tian, Tzu-Yang Yu, and Xingwei Wang "Miniature fiber optic temperature sensor for concrete structural health monitoring", Proc. SPIE 8345, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012, 83454V (6 April 2012); https://doi.org/10.1117/12.915265

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