Quasi-distributed recirculation fiber-optic temperature sensor

The new structure of the quasi-distributed fiber-optic temperature sensor is offered, based on recirculation frequency registration a single pulse with its periodic regeneration on different wavelengths and allowing simultaneously to spend measurements to ten points. Fiber-roptic sensor was constructed as a closed optoelectronic contour formed by a source of radiation, an optical fiber delay line, spectral reflective elements, photoreceiver and regeneration block. The sensitive element of this device was the optical fiber. The error of temperature measurements does not exceed 0.2°C at measurement time 1 s, thus the maximum length of the fiber-optic measuring converter reaches 15 km at use multimode gradient optical fiber. © 2009 Allerton Press, Inc.