Abstract
Accurate measurement of bolt force condition is essential for safe operation of industrial infrastructures. We propose a novel bolt force sensor based on fiber Bragg grating (FBG) with features of quasi-distributed sensing and anti-torque interference. The sensor consists of three strain measurement units and a temperature compensation unit, and a miniature bearing-based anti-torsion structure is applied to the strain measurement unit to make it immune to torque. The manufactured sensor was embedded into the bolt to obtain a smart bolt with capabilities of strain and temperature sensing, and relevant performance tests were carried out. Experimental results showed that the sensitivities of the sensor are 5.564 pm/KN, 6.405 pm/KN, 6.777 pm/KN in the measurement range of 25 KN, respectively. Moreover, the sensor has good quasi-distributed measurement capability, and performs well in terms of creep and torque resistance. In practice, the number of measurement units can be selected as required.
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