Distributed fiber-optic sensor

especially interferometers

which has unique advantages become a hot topic in recent years.Principle of dual-ring Mach-Zehnder interferometer system is proposed to deal with the issue of monitoring of long perimeter and wide range of facilities.Acccording to the characteristics of invasion signal

an improved method which called dual-correlation algorithm is used to solve the problem of real-time and computation quantity in the pocess of localization of invasion point.The experimental datas indicate that this method really works.