With the breakthrough development and iteration of fiber optic sensing technology, the fiber optic temperature measurement system based on gallium arsenide (GaAs) has become the current international leading high-precision temperature online monitoring solution, especially in. With the breakthrough development and iteration of fiber optic sensing technology, the fiber optic temperature measurement system based on gallium arsenide (GaAs) has become the current international leading high-precision temperature online monitoring solution, especially in. This paper presents the development and improvement of an intelligent cable monitoring system for the underground distribution power system, using DTS technology and OFCPCs as the underground distribution lines in the field. Introduction With the application of the Smart Grid concept to the. The RTTR cable monitoring system consists of a temperature measurement device, the Distributed Temperature Sensing (DTS), and our visualization and RTTR calculation software, a current interface for reading in the current data, an optical fiber for temperature measurement and network interfaces for. OPTHERMO™ is a distributed temperature sensing system that uses optical fibers as sensors. Measure the temperature along a fiber optic cable or optical loss/attenuation, bend detection and integrity monitoring (Patent pending) with the integrated dual wavelength Rayleigh OTDR. It can be. Fiber optic temperature sensors are immune to the many environmental effects that compromise other measurement technologies, can be embedded and installed in locations traditional temperature sensors cannot and deliver an unprecedented level of spatial detail and data without sacrificing precision. The DTSX distributed optical fiber temperature sensor is a solution for monitoring abnormal cable temperatures and cable tunnel fires. It is a powerful tool for maintenance of critical power infrastructure.