| The DiTeSt is a unique tool for the evaluation of distributed strain and/or temperature over several tens of kilometers. It is a powerful diagnostic instrument for the identification and localization of potential problems. It allows the monitoring of local strain and temperature at thousands locations by mean of a single optical fiber and in just one shot. Its inherent high stability and self-referenced principle of operation allows on-line or off-line long-term monitoring of large structures.
The DiTeSt® is a laser-based measurement system using an optical scattering measurement principle within the sensing fiber: Stimulated Brillouin Scattering. It can operate using standard single mode telecommunication fibers and cables as sensing element, as well as with special single mode fibers. Stimulated Brillouin Scattering is an intrinsic physical property of the fiber material and provides information about the strain and temperature distribution actually experienced by the sensing fiber. The local characteristics of Stimulated Brillouin Scattering are measured thanks to an innovative and highly reliable configuration developed by the Metrology Laboratory of the Swiss Federal Institute of Technology of Lausanne. This measurement technique relies on the use of a single laser source and is therefore totally self-referenced allowing periodic measurements without any preliminary calibration.
The system can operate in two configurations: loop (with both ends of the sensing fiber connected to the measurement unit) or single-ended (with a mirror at the end of the fiber). Multiple fibers can be automatically connected to the instrument through an integrated optical switch. Through the use of optional range extenders it is possible to monitor distances up to 100 km.
The system includes an industrial PC with LCD screen and internal hard-disc storage, allowing great versatility in terms of connections: LAN, wireless, remote control/configuration/maintenance. The integrated software is user-friendly and allows an easy setup of the parameter through the use of self-configuration wizards. Data retrieved from multiple measurements can be simultaneously displayed and compared on screen. When pre-defined warning levels are exceeded, the system can generate alerts and activate relays (optional). The system can operate interactively or in automatic mode, gathering data according to a schedule. |
دانلود