Seabed dissolved CO2 gas detection method and system based on photonic crystal fiber

A technology of photonic crystal fiber and gas detection system, which is applied in the direction of measuring devices, material analysis through optical means, instruments, etc., can solve the problems of slow speed and slow response speed of instruments, so as to reduce response time, improve sensitivity, eliminate The effect of maintenance issues

Inactive Publication Date: 2019-12-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

This approach has some disadvantages, that is, the gas only diffuses through one end of the photonic crystal to fill the entire pho...

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  • Seabed dissolved CO2 gas detection method and system based on photonic crystal fiber

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[0052] The present invention is based on seabed storage of CO 2 Proposed under the technical background, through the indirect application of photonic crystal fiber, the slow light waveguide of photonic crystal is used to detect dissolved CO in seawater 2 content. CO in the surrounding seawater 2 Real-time monitoring of the content of the seabed CO 2 Leakage can be detected immediately, so that specific measures can be taken to prevent excessive CO dissolved in seawater 2 Hazards to underwater food chains.

[0053] like figure 1 As shown, the present invention's photonic crystal fiber-based seabed dissolved CO 2 The gas detection system includes a sampling device 1, a DFB laser 6, a beam splitter 8, a measurement optical path and a reference optical path. The light output end of the DFB laser 6 is provided with a beam splitter 8 . The interior of the DFB laser 6 is provided with a Bragg grating, which is mainly made of a semiconductor, and the emitted laser has particul...

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Abstract

The invention discloses a seabed dissolved CO2 gas detection method and system based on a photonic crystal fiber. The method comprises the steps of (1) separating gas in seawater from the seawater, (2) judging the type and concentration of gas to be detected, and (3) obtaining a pure useful signal in direct proportion to the CO2 concentration of detected gas to characterize CO2 concentration information. The system comprises a sampling device, a laser, a beam splitter, a measurement light path and a reference light path, the sampling device is connected with the measurement light path, the laser is connected with a laser driver, the beam splitter is arranged at a light outlet end of the laser, output light of the beam splitter is connected with the measurement light path and the referencelight path through a single-mode optical fiber. By monitoring the content of CO2 in surrounding seawater in real time, that the CO2 leakage at a seabed can be immediately detected is ensured, and theproblem that the separation and measurement precision of CO2 dissolved in the seawater cannot meet the requirements is solved.

Description

technical field [0001] The invention relates to a method for dissolving CO in the seabed 2 Gas detection method, belonging to seabed dissolved CO 2 detection technology field. Background technique [0002] In recent years, due to the continuous advancement of the industrialization process, a large amount of fossil fuels have been used, causing the content of carbon dioxide in the atmosphere to rise sharply, leading to the intensification of the greenhouse effect, which has had a profound impact on the ecological environment and people's living environment. For a long time, about 50% of the world's carbon dioxide exists in the ocean. The ocean, which accounts for more than two-thirds of the earth's surface area, has become an important part of the carbon cycle between the land and the ocean, maintaining the earth's carbon balance. aspect plays an indispensable role. However, due to the rapid growth of carbon dioxide in recent years, the ocean cannot be converted in time, a...

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Application Information

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IPC IPC(8): G01N21/3504
CPCG01N21/3504
Inventor 李国林张志涛季文海
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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