Automatic control heat source specially-produced single-mode fiber for hydraulic engineering seepage monitoring

Abstract

The invention discloses an automatic control heat source specially-produced single-mode fiber for hydraulic engineering seepage monitoring. The fiber sequentially includes, from inside to outside, a single core fiber, an inner protection elastic layer, a heat insulation steel ring, an inner-layer filling ring, an elastic hard ring and an antiseepage heat insulation hard sleeve ring. The single core fiber is connected to a plurality of outer circular guard pipes. The outer circular guard pipes sequentially pass through the inner protection elastic layer, the heat insulation steel ring, the inner-layer filling ring and the elastic hard ring to be connected with the antiseepage heat insulation hard sleeve ring. Each outer circular guard pipe is filled with a drainage water storage cotton sleeve, the drainage water storage cotton sleeve is connected to a second filter screen, and the second filter screen is connected to a first filter screen. The inner protection elastic layer, the heat insulation steel ring, the inner-layer filling ring, the elastic hard ring and the antiseepage heat insulation hard sleeve ring are disposed outside the single core fiber, so automatic temperature changing of the single core fiber can be achieved. Moreover, a great temperature difference is formed between the single core fiber and an environment, so the seepage identification level and the practicality can be substantially improved when the fiber 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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