Method for measuring sea water temperature profile based on optical fiber Brillouin scattering principle
A technology of Brillouin scattering and temperature profile, applied in the field of measurement, can solve the problem that the optical cable cannot meet the application requirements, and achieve the effect of improving spatial resolution, good tensile strength and high pressure sensitivity
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[0027] Both BOTDR and BOTDA systems realize distributed measurement by detecting the Brillouin frequency shift. The measurement method of the present invention is: during measurement, the measuring instrument is installed on an ocean buoy, ship or offshore oil platform, and the sensing optical cable is placed vertically When entering seawater, light pulses are sent from one end of the fiber, and Brillouin scattered light is generated in the fiber medium. Both temperature and pressure will cause the frequency shift of the Brillouin scattered light. Figure 4 It is an embodiment (the temperature distribution along the length of the optical fiber changes stepwise in five intervals, and the Brillouin frequency shift at the peak light intensity corresponding to each interval is different). From Figure 4 It can be seen that when the temperature changes, the Brillouin scattering spectrum along the 150m sensing fiber shows an obvious shift of the center frequency (Brillouin frequency...
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