Distributed network Optical fiber Heat flow monitoring technology has been widely used in industrial field. Leakage monitoring system of optical fiber temperature measurement is expected to replace the traditional spot temperature sensor used in dam and dike, and can greatly improve the probability of finding the hydraulic structure and foundation of concentrated leakage passage.
The leakage of distributed optical fiber temperature measurement applied to dam internal detection in two ways: the gradient and electric pulse.
The gradient method using optical fiber system for direct measurement of the actual temperature in the soil, right optical cable For heating, the premise is the river or reservoir water temperature and soil temperature measurement location has obvious temperature difference, resulting in infiltration around Water Leakage will produce local temperature anomalies.
The electric pulse method is energized by an electrical conductor of cable protection metal shell layer or a special cable, the cable is heated to a certain extent, can overcome the adverse effects of possible.
When there is leakage flow, optical fiber and cable The heating process can be seen in the abnormal distribution of leakage zone temperature obviously. These two methods were used to detect the leakage has been successfully tested, and apply after a way more widely.
