Discrete single-point displacement dynamic monitoring device and method based on laser ranging

Abstract

The invention provides a discrete single-point displacement dynamic monitoring device based on laser ranging, and the device comprises: a receiving target which comprises a target surface made of a light-absorbing material, wherein the target surface is provided with a reflective ring capable of diffusely reflecting incident light; a connecting rod, wherein a first end part of the connecting rod is fixedly connected with a measured discrete single point, and a second end part of the connecting rod is fixedly connected with the target surface and is located at the circle center of the reflective ring; a laser emitter which comprises a base and two laser range finders arranged on the mounting surface of the base, wherein two beams of laser emitted by the two laser range finders are parallel; a driving mechanism which is used for driving the base to translate and rotate; a signal processing system which is in signal connection with the laser range finder and the driving mechanism, wherein the displacement of the discrete single point is calculated through a built-in algorithm according to the distance value measured by the laser range finder and the translation distance and the rotation angle of the base. The invention further provides a discrete single-point displacement dynamic monitoring method based on laser ranging. Displacement generated by discrete single points can be effectively monitored in real time.

Description

technical field [0001] The invention relates to the field of civil engineering measurement, in particular to a discrete single-point displacement dynamic monitoring device and method based on laser ranging. Background technique [0002] In the field of traditional civil engineering, the deformation of tunnels, bridges, foundation pits, etc. is generally monitored manually. Due to the low efficiency of manual measurement of deformation and the difficulty of real-time monitoring, there are also some automatic monitoring methods in the prior art. At present, the automatic monitoring methods of deformation are mainly based on laser measurement technology and image measurement technology. The former mainly uses automatic total station, laser range finder and laser scanner; the latter mainly uses image processing technology, digital photography measurement technology. [0003] Due to the automatic monitoring method based on image processing technology and digital photogrammetry ...

AI Technical Summary

Problems solved by technology

[0003] Due to the automatic monitoring method based on image processing technology and digital photogrammetry technology, it is necessary to sample high-definition image data. In civil engineering, the size of the measured object is generally large, and the lighting environment is not good due to site environmental constraints and construction interference. It is more complicated, and it is difficult to collect high-resolution original images, which affects the final measurement accuracy

[0004] Compared with image processing technology and photogrammetry technology, fully automatic total station has high measurement accuracy and high degree of automation, but the cost is relatively high

The measurement results of laser measurement and deformation by laser scanner are stable and reliable. The laser scanner can scan and obtain full-section data, and the accuracy is high during static scanning; but the laser scanner is not only expensive, but also when the measurement purpose is high-precision measurement and a discrete single point is specified When the displacement is deformed, it is difficult to locate the specified measuring point, and the amount of redundant data processed is large, which is not conducive to real-time monitoring

The laser rangefinder is cheap and can measure the distance of a single measuring point with high accuracy, but it cannot obtain the three-dimensional coordinates of the measuring point, and after the measuring point has shifted, it is difficult to automatically track and aim at the measuring point again

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