物联网-智慧交通-对同轴电缆布拉格电栅传感特性的研究.pdf

Abstract

Currently, FBG sensors are widely used in structural health monitoring systems.

However, the existing fiber Bragg grating sensors in practice there are still many

problems. This article uses the coaxial cable as the sensing medium , with coaxial

photonic crystal fiber Bragg grating structure methods and principles , put forward the

concept of coaxial Bragg electric gate . Bragg grating coaxial electric wave

concepts implemented in the coaxial cable of the new device, which has a similar

grating transmission and reflection characteristics , but also is a fiber does not have

the ability to withstand large strain , in the field of large strain sensing is expected to

place. However, few domestic coaxial cable Bragg grating system for theoretical

studies and simulation. First, through the transmission line and the mode coupling

theory of the basic principles of coaxial cable Bragg grating are described, studied the

effects of coaxial cable Bragg grating mechanism . Finally, the coaxial cable Bragg

grating basic structure , and the use of transmission line theory of coaxial cable Bragg

grating deduced reflection coefficient .

Further use of the electromagnetic simulation software Ansoft HFSS carried out

a number of different periods , different cycle lengths and different drilling conditions

and other circumstances of the simulation ; parameters were compared over the

frequency on the electrical characteristics of the gate , reached the following

conclusions : coaxial cable Bragg grating based on the same cable resonant frequency

and cycle length is inversely proportional to the number of cycles increases with the

resonant peak and by the shape and size affect drilling ; was further realization based

on a coaxial Bragg grating sensor electrical parameter optimization of experimental

studies and provide theoretical guidance.

Finally, the production of coaxial cable Bragg grating through laboratory, build

system experiments, the final results were compared with the simulation results ,

Key words: coaxial cable Bragg grating; CCBG sensing; HFSS;

状况作对比来评估建筑结构的健康情况。