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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, easy drying, and high pressure sensitivity

Inactive Publication Date: 2010-09-08
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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  • Method for measuring sea water temperature profile based on optical fiber Brillouin scattering principle
  • Method for measuring sea water temperature profile based on optical fiber Brillouin scattering principle
  • Method for measuring sea water temperature profile 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 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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Abstract

The invention discloses a method for a measuring sea water temperature profile based on an optical fiber Brillouin scattering principle. A Brillouin optical time domain reflection principle-based measurement system consists of a narrow line-width laser, an optical coupler, a pulse generator, an optical modulator, a circulator, an optical switch, a photoelectric detector, a Brillouin frequency shift detection unit and a sensing optical cable. The sensing optical cable used by the invention has a small size and sea water corrosion resistance, and is convenient to use. The measurement system has high reliability and high measuring sensitivity, can provide continuous temperature field distribution of the sea water profile, and is particularly suitable for real-time continuous measurement of the sea water temperature profile.

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): G01K11/32G01K11/322
Inventor 李永倩尚秋峰杨志赵丽娟
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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