A special single-mode optical fiber with automatic control heat source for hydraulic seepage measurement

Abstract

The invention discloses a special single-mode optical fiber with automatic control heat source for hydraulic seepage measurement, which is sequentially provided with a single-core optical fiber, an inner protective elastic layer, a heat-insulating steel ring, an inner layer filling ring, an elastic hard ring, and an anti-seepage optical fiber. The heat-insulating hard ferrule, the single-core optical fiber is respectively connected with several outer sheathing tubes, and the outer sheathing tubes pass through the inner protective elastic layer, the heat-insulating steel ring, the inner filling ring, the elastic hard ring and the seepage barrier in turn. The heat-hard collar is connected, and the outer circular sheath protective tube is filled with drainage and water storage cotton sleeves, and the drainage and storage cotton sleeves are connected with the second filter screen, and the outside of the second filter screen is connected with the first filter screen. The self-controlled heat source special single-mode optical fiber for hydraulic seepage measurement of the present invention realizes the realization of The automatic temperature change of the single-core optical fiber and the large temperature difference between the single-core optical fiber and the environment can significantly improve the recognition and practicability of seepage when it is applied to seepage monitoring.

Description

technical field [0001] The invention relates to a single-mode optical fiber, in particular to a special single-mode optical fiber with an automatic control heat source for hydraulic seepage measurement. Background technique [0002] The birth of optical fiber not only brought innovations to the field of communication, but also promoted major changes and developments in the field of sensing and monitoring. Optical fiber sensing technology has strong anti-electromagnetic interference ability, low cost, and the technical advantages of distributed monitoring, which promote its more and more widely used in the fields of water conservancy, civil engineering and other engineering safety and health monitoring. Due to the perfection and the particularity of the working environment, there are still a large number of technical problems that have not been effectively resolved when the optical fiber sensing technology is applied to the seepage monitoring of hydraulic structures (especial...

AI Technical Summary

Problems solved by technology

Although the traditional optimized design of optical fiber layout scheme has played a positive role in improving the accuracy and efficiency of optical fiber seepage measurement, it still cannot fundamentally solve the technical defects and deficiencies of traditional optical fiber seepage measurement, and often significantly increases the difficulty of construction and layout costs, which greatly limit the application and promotion of this technology in actual engineering

[0003] When using sensing optical fiber for seepage monitoring, at present, it is often necessary to heat the optical fiber with the help of an external circuit. For this reason, not only the optical fiber used is required to have a heating function, but also a complete heating circuit must be constructed, which greatly increases the production cost of the optical fiber, and Because it is difficult to coordinate the relationship between the voltage of the external circuit and the heating fiber in indoor and outdoor monitoring, the voltage of the heating fiber is often unstable or too large, and even the sheath of the fiber is loose or even burnt in a short period of time. , causing serious harm to operators and instruments; in addition, the on-site monitoring applied to actual projects often lacks necessary safety measures, and it is difficult to lay heating circuits, especially for water conservancy and hydropower projects, because most of them are located in remote areas. And the operating environment is extremely harsh, the realization of optical fiber laying and heating functions is more difficult or even impossible

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