Leak monitoring and localization in baghouse filtration system using a distributed optical fiber dynamic air pressure sensor

摘要

Coherent Rayleigh backscattering noise produced by the detection of the dynamic airflow applied to a standard optical fiber is proposed to monitor and locate the potential broken fabric bags within a baghouse filtration system with a sensing distance of 2 km. The optical fiber cable hangs freely inside the fabric bags with small leak holes. Experimental results demonstrated that the proposed distributed optical air pressure sensor is capable of identifying broken bags via the measurement of airflow perturbation applied onto the optical fiber cable. Field test at a baghouse filtration test platform was conducted and results showed that the location accuracy of the system is less than +/- 5 m with a detectable hole diameter of 0.3 cm and a recognition rate of similar to 87.6% measured by Adaboost-Support Vector Machine (ADA-SVM) method. A false alarm rate of 9% for this particular leak diameter is achieved.