Low coherence optical monitoring system and method for micron settlement of long-span foundation of high speed railway

Abstract

The invention relates to a low coherence optical monitoring system and method for micron settlement of the long-span foundation of a high speed railway, and belongs to the technical field of photo-electro-mechanical integration measurement. A central liquid storage tank and a reference liquid storage tank are arranged on the foundation of a non-settlement area; a plurality of testing liquid storage tanks are arranged on the foundation of a settlement area; the upper half parts of the liquid storage tanks are filled with gas; the bottom ends of the liquid storage tanks are communicated with one another through a liquid connecting pipeline; the upper ends of the liquid storage tanks are communicated with one another through a gas connecting pipeline; the liquid connecting pipeline for communicating the liquid storage tanks is communicated with the gas connecting pipeline for communicating the liquid storage tanks through a vertical observation pipeline; low coherence optical sensors are mounted inside the testing liquid storage tanks. A signal transmission system converts the measured optical information into an electric signal to be input into a computer, and the settlement is displayed in real time. The low coherence optical monitoring system is stable in performance and is not influenced by severe environments such as a tunnel, and the low coherence optical monitoring method is a novel optical fiber settlement monitoring method suitable for existing structures and new structures.

Description

technical field [0001] The invention relates to a low-coherence optical monitoring method for micron subsidence of large-span foundations of high-speed railways. It is a measurement system combining optical fiber transmission, low-coherence optical interference and precision leveling technology, and belongs to the field of optical-mechanical-electrical integration measurement technology. Background technique [0002] Settlement monitoring is an important indicator of long-span civil structures such as high-speed railways. At present, precision levels, precision triangular elevation measurements, and global satellite positioning systems (GPS) are commonly used for ground and bridge foundation settlement monitoring. The precision leveling survey developed by Kang Company is the main method used in high-speed railway settlement monitoring. Due to the cost of monitoring, precision triangular elevation measurement is a supplement to precision leveling, and these two methods play ...

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Problems solved by technology

However, because GPS needs to observe satellites, it is not suitable for tunnels or areas where it is difficult to observe satellites, and its accuracy is best at 10 cm, which is far from meeting high precision

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