Steel rail or bridge displacement monitoring device for fiber Bragg grating transformation ring

Abstract

Disclosed is a rail or bridge displacement monitoring device for a fiber grating deformation ring. The device is composed of a fixing clip assembly, a connection assembly, a fiber grating annular displacement sensing assembly, a pull rod assembly and a sensor housing device. Part of the device is fixed on the steel rail or the measured beam of the bridge by the fixing clip assembly, and the other part is fixed on the ballastless track bed or the reference beam of the bridge by the sensor housing, and the two parts are connected by a connecting component. The invention cures two optical fiber gratings with different wavelengths on a rigid ring in a vertical state. The force generated by the displacement of the measured object is transmitted to the rigid ring through the pull rod and the spring, resulting in opposite forces on the two fiber gratings, and the center wavelength shifts in the opposite direction. The displacement of the measured object is obtained by superimposing the wavelength shift value , which avoids the optical signal distortion caused by the direct pasting of the grating, and offsets the interference caused by the ambient temperature. The device is suitable for long-term on-line monitoring, sensitive, stable and reliable, compact in structure and easy to maintain.

Description

technical field [0001] The invention relates to the technical field of rail displacement monitoring on a railway ballastless track bed, or the telescopic displacement monitoring of simply supported beams or continuous beams of railway bridges, and the technical field of optical fiber grating sensing. Specifically, it is a steel rail or bridge displacement monitoring device for a fiber grating deformation ring. Background technique [0002] Railway transportation plays a pivotal role in the national economy, and rails and bridges are the infrastructure of railway transportation. In recent years, with a large number of heavy-duty and speed-up trains running, as well as the construction and opening of multiple high-speed railway passenger lines, the monitoring requirements for their infrastructure have become higher and higher, and key technical means have been developed to monitor their operating status. It is extremely important to monitor the parameters to ensure its safe o...

AI Technical Summary

Problems solved by technology

Laser displacement monitoring requires manual operation, limited measurement accuracy, and cannot realize automatic measurement, etc.; capacitive displacement sensors are affected by temperature due to the different materials that make up the sensor, causing measurement errors, and edge effects will also reduce sensor sensitivity and increase nonlinearity. Moreover, the interference of foreign objects or people on the trackside produces parasitic capacitance, which leads to unstable sensor characteristics; the video imaging technology needs to wipe the camera and scale due to environmental pollution, and bad weather is easy to damage the equipment

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