Structure safety optical fiber intelligent test and early-warning system

Abstract

The invention discloses an optical fiber intelligent detecting and early warning system with a safe structure, particularly a detecting and early warning system with simple laying process, high reliability and strong anti-interference ability. The system comprises optical fiber, an optical fiber light path monitor and an early warning display, wherein the optical fiber light path monitor is configured by connecting a detection signal output end of a laser transceiver with a monitoring controller, one end of the optical fiber is connected with the transmitting end of the laser transceiver and the other end is connected with the receiving end of the laser transceiver, and the monitoring controller is connected with the early warning display. The detecting and early warning system according to the invention performs judgement by on-off detection of the optical fiber light path, has strong anti-electromagnetic interference ability, can effectively realize safe detection of building structures, and automatically gives the early warning. The invention has advantages of low cost and simple laying process.

Description

technical field [0001] The present invention relates to an optical fiber monitoring system, more specifically, relates to an optical fiber detection and early warning system applicable to the structural safety of elevated overpasses, elevated expressways, elevated railways, bridges, tunnels, oil pipelines, dams, and large buildings. system. Background technique [0002] With the development of my country's transportation and construction industry, a large number of elevated overpasses, elevated expressways, elevated railways, bridges, tunnels, oil pipelines, dams, large buildings and other structural buildings have been built. However, due to natural disasters or man-made reasons, the safety of the above-mentioned structural buildings will also be threatened. Making effective early warnings in time often results in heavy casualties and property losses. At present, both at home and abroad are devoting themselves to the research on the effective detection of the safety of bu...

AI Technical Summary

Problems solved by technology

However, due to the high cost of the above-mentioned monitoring systems, the popularization and application in practice is limited.

Among them, the distributed optical fiber monitoring system is formed by connecting several optical fiber sensors in series through an optical fiber, which mainly has the following disadvantages: (1) Due to the large loss of optical power in the system, one optical fiber can only Limited fiber optic sensors, generally only 8-12 fiber optic sensors can be connected, and there are few detection points

(2) The distributed optical fiber monitoring system is essentially a series connection and multiplexing system of multiple single-point fiber optic sensors. Once the system is buried and installed, the number of measurement points cannot be increased.

(3) Both optical fiber and sensor must be connected, and the system cost is high

The fiber grating sensor monitoring system uses a high-power wavelength-scanning laser to generate a modulated laser light source signal, senses the signal with an optical fiber, and then uses an optical fiber to transmit the signal. It is still a point measurement. If distributed multi-point measurement is implemented on one optical fiber, the cost Very high, the current unit price of domestic "bare grid" is about 300 yuan, which is only suitable for laboratory use, and the price of modular packaging products is higher

Moreover, while optical fibers are needed, "sensors (high-power wavelength-scanning lasers)" must still be connected. Engineering applications must be packaged, which not only costs high, but also increases the difficulty of installation and construction.

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