Fabry-Perot optical fiber intelligent anchor rod for monitoring scouring depth of bridge pier

Abstract

The invention relates to an intelligent anchor rod for monitoring the scouring depth of a pier based on a Fabry-Perot optical fiber pressure sensing unit, belongs to the field of structural health monitoring, and is particularly used for monitoring the scouring depth of the pier. The anchor rod comprises a Fabry-Perot optical fiber pressure sensing unit, an anchor rod and a multi-channel Fabry-Perot demodulator. The Fabry-Perot optical fiber pressure sensing unit comprises a single-mode optical fiber, a spring, a shell, a piston, a reflecting mirror surface, a circular plate, a partition plate, a connecting rod, an optical fiber hoop and an optical fiber protection hose. According to the device, based on the optical fiber Fabry-Perot interference principle, water pressure signals of different depths are converted into piston movement and further converted into adjustable optical signals, then the water pressure is measured through the piston spring mechanical balance relation, and thus monitoring of the scouring depth of the bridge pier is achieved. The device can realize long-term, lossless and real-time monitoring of the scouring depth of the bridge pier, has the advantages of high measurement precision, simplicity in manufacturing, small size and the like, has a wide application prospect, and is easy to popularize.

Description

technical field [0001] The invention relates to an intelligent anchor rod for monitoring the scour depth of bridge piers based on a FAPO optical fiber pressure sensing unit, which belongs to the field of structural health monitoring, and is especially used for monitoring the scour depth of bridge piers. Background technique [0002] With the development of modern transportation network, a large number of cross-river railways, highway bridges and sea-crossing bridges have been built to solve the problem of cross-river links in land transportation, but the construction of bridges has changed the water flow structure of the river under the bridge, and the riverbed around the bridge piers has scour. This not only affects the evolution trend of the river section where the bridge is located, but may also threaten the safety and stability of the bridge structure. Among them, the scour depth is the most important factor affecting the safety of the bridge, and the monitoring of the s...

AI Technical Summary

Problems solved by technology

Ultrasound has good propagation performance, but the propagation of ultrasonic waves in water is reduced, sonar equipment is expensive, especially when floods occur, the monitoring results are difficult to distinguish and interpret

The diving detection speed is slow, the detection cost is high, and it poses a great threat to divers' personal safety, especially in deep water, turbulent rivers, and when there are branches and aquatic plants under the bridge, safety accidents are prone to occur

Current methods for scour depth monitoring have shortcomings in terms of accuracy, cost, and stability

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