Coaxial Cable Bragg Grating

Robust, embeddable. remotely-interrogated strain sensors are highly desired for structural health monitoring (SHM) to ensure continuing safe operations of the nation’s critical infrastructures. Inspired by the coaxial photonic crystals and optical fiber Bragg grating (FBG). we propose to conduct fundamental research that will lead to the development and demonstration of a new sensor technology based on the novel concept of coaxial cable Bragg grating (CCBG). the new CCBG sensor will have the same attractive attributes as FBG such as high resolution, remote operation and multiplexing capability. In addition, using an elastic coaxial cable as the signal transmission medium, the new CCBG sensor has the unique advantages of large strain capability and robustness to survive harsh conditions. As such, the new CCBG sensors may provide to address a number of insufficiently-addressed areas in SHM, such as post seismic and disaster monitoring and study of the progressive collapse of structures under extreme loads. In this paper, the research contains fundamental physics^modeling and simulation、demonstrate the sensor’s capability.The specific researches include:(1) Understand the fundamental physics of CCBG through Transmission and Bragg condition guide the sensor design and fabrication. Offer two different techniques to generate periodic discontinuities on a coaxial cable for fabrication of CCBG devices.(2) Modeling and simulation through three-dimensional electromagnetic field simulation software (HFSS) to gain a comprehensive understanding of the correlations between the performance and the structural/material parameters of the CCBG device. Inspired by window function optimization method in digital signal processing, design window function CCBG models to achieve process the signal.(3) Investigate two techniques to fabricate high quality CCBG sensors through experimental verifications. Seek for the optimal techniques and processes to generate the periodic discontinuities and fabricate high quality CCBG devices.(4) Test coaxial cable Bragg grating for large strain to perform Characterize the sensor performance and demonstrate the sensor’s unique capability for SHM.