Combined Brillouin sensor system for simultaneous local and distributed temperature and strain measurements for downhole telemetry

Abstract

Abstract The work proposes and experimentally demonstrates the feasibility of creating a combined sensor system for simultaneous local and distributed temperature and strain measurements using the Brillouin optical frequency distributed analysis. The system uses a quasi-distributed approach based on two-element fiber Bragg structures (TEFBS), which makes it possible to carry out simultaneously distributed and local measurements of temperature. The proposed highly integrated circuit uses a conventional narrow-band optical source corresponding to the spectral range of temperature measurements, and a common receiving module on the same sensor fiber. For distributed detection, a single-mode optical fiber is used, and for the local detection, two TEFBS pass-through and reflective types are used.