Abstract
We newly develop a temporal gating scheme to enlarge the measurement range of Brillouin optical correlation-domain reflectometry (BOCDR) for a fiber-optic distributed strain measurement. In this scheme, the trade-off problem between the measurement range and the spatial resolution can be dissolved. 66-cm spatial resolution and 1-km measurement range were simultaneously obtained with 50-Hz sampling rate.
Highlights
Many fiber-optic strain/temperature sensors have been proposed based on various phenomena including scattering, optical loss, and polarization
Brillouin scattering-based distributed fiber-optic sensors are classified into two types: “reflectometries”, in which a light beam is injected into one end of the fiber under test (FUT), and “analysis systems”, in which two light beams are injected into both ends of the FUT
An optical filter composed of fiber Bragg grating (FBG) with a 3-dB bandwidth of about 10 GHz was inserted after the Er-doped fiber amplifier (EDFA) in order to suppress the Rayleigh scattering and the Fresnel reflection in the FUT at frequency f0
Summary
Many fiber-optic strain/temperature sensors have been proposed based on various phenomena including scattering, optical loss, and polarization. Several kinds of analysis systems have been studied, including the Brillouin optical timedomain analysis (BOTDA) [3]-[5] and the Brillouin optical correlation-domain analysis (BOCDA) [6]-[8] Those systems utilizing the stimulated Brillouin scattering (SBS) can obtain relatively large signals, they need two-end access, which is often not feasible in a long-range measurement, and cannot work completely when the FUT has even one breakage point. We newly implement a temporal gating scheme to obtain higher NR, namely, to enlarge the measurement range of BOCDR while maintaining the spatial resolution In this scheme, any correlation peak within the FUT can be arbitrarily selected, so that multiple correlation peaks can be utilized.
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