Distributed Fiber Strain and Temperature Sensing System (DTSS)

A distributed fiber optic strain and temperature sensing system based on Brillouin scattering is an advanced technology that transforms standard telecommunication fibers into highly accurate distributed sensors. Also known as Brillouin Optical Time Domain Reflectometry (BOTDR), this system provides real-time monitoring of both strain and temperature variations along the entire length of the fiber with excellent spatial resolution.

​

The fundamental principle relies on Brillouin scattering, where incident laser pulses interact with acoustic phonons generated by thermal and mechanical effects within the fiber core. This interaction produces frequency-shifted backscattered light, known as the Brillouin shift, which is directly related to the local strain and temperature at each point along the fiber.

​

By analyzing the frequency and intensity of the Brillouin backscattered signals, the system accurately reconstructs the distributed profiles of strain and temperature. External mechanical stress or thermal changes induce variations in the Brillouin frequency shift, enabling precise detection and localization of structural changes, deformations, and thermal events throughout the monitored infrastructure.