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Seawater temperature profile BOTDA measuring method based on optical fiber Brillouin scattering principle

A Brillouin scattering and temperature profile technology, applied in the field of measurement, can solve the problems that optical cables cannot meet the application requirements, and achieve the effects of improving spatial resolution, good tensile strength, and high pressure sensitivity

Active Publication Date: 2012-02-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

However, existing optical cables cannot meet the above application requirements

Method used

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  • Seawater temperature profile BOTDA measuring method based on optical fiber Brillouin scattering principle
  • Seawater temperature profile BOTDA measuring method based on optical fiber Brillouin scattering principle
  • Seawater temperature profile BOTDA measuring method based on optical fiber Brillouin scattering principle

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Embodiment Construction

[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 the Brillouin scattering spectrum along the 150m sensing fiber exhibits a clear shift of the center frequency (Brillouin frequency shift) of the Brillouin spect...

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Abstract

A seawater temperature profile BOTDA measuring method based on an optical fiber Brillouin scattering principle is disclosed. In the invention, a sensitive optical cable is formed by combining a pressure sensing fiber which directly contacts with the seawater and a temperature sensing fiber which shields seawater pressure. A measuring part of a measuring system based on a BOTDA principle comprises: a narrow linewidth laser, an optical coupler, a pulse generator, a first light modulator, a light amplifier, a sweeping-frequency electrooptic modulator, a circulator, a grating filter, an optical isolator, a polarization scrambler, an optical filter, an optical switch and a Brillouin frequency shift detection unit. The sensitive optical cable used in the invention has a small volume, is convenient to be used and possesses good seawater corrosion resistance. The measuring system has high reliability and sensitivity, can provide continuous temperature field distribution of the seawater profile and is suitable for real-timely measuring the seawater temperature profile continuously.

Description

technical field [0001] The invention relates to a method for measuring the temperature distribution of seawater along the depth direction, which belongs to the technical field of measurement. Background technique [0002] Seawater temperature is an important content in marine survey and monitoring, and an indispensable technical parameter in marine hydrology, meteorological observation and survey. The measurement of seawater temperature profile has very important practical significance for the research of marine science, marine environment monitoring, seasonal climate prediction and marine fishery. The so-called seawater temperature profile measurement refers to the measurement of seawater temperature distribution along the depth direction. The water depth and the temperature information of the corresponding depth need to be given, and the observation time needs to be given for long-term real-time observation. [0003] The main equipment used for seawater temperature profi...

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Application Information

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IPC IPC(8): G01K11/32G01K13/02G01B11/22G01K11/322
Inventor 李永倩杨志尚秋峰
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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