Multi-beam deformation detecting device and use method thereof

Abstract

The invention relates to a multi-beam deformation detecting device which comprises a probe, a digital signal processor DSP, a personal computer PC, a laser group and a prism reflection target, wherein the prism reflection target is arranged on a point to be tested, the probe and the laser group are arranged on a measuring point, a laser beam group emitted from the laser group is reflected through the prism reflection target by adjusting the laser group and then forms an overlapped light spot on the probe, a barycenter of the overlapped light spot is determined by utilizing a photoelectronic tracing macro pixel iteration barycenter method, and the deformation of the point to be tested is further determined through the barycenter offset distance. The invention can effectively avoid the influences on environmental change, air turbulence and stray light, can realize long-term online monitoring, and has accurate measurement data, high detection precision, simple structure, low cost and convenient operation.

Description

technical field [0001] The invention belongs to the field of deformation measurement, in particular to a device for detecting the deformation of a point to be measured by measuring the spot movement of multiple laser beams and a method for using the same. Background technique [0002] Detecting the subsidence and movement of modern large buildings such as bridges plays an important role in modern road and bridge construction. The optical method can realize high-precision real-time detection of bridge deflection. Among optical methods, laser method, laser imaging method and photoelectric imaging method are three important methods. [0003] Liu Niandong of Chongqing University and others used the laser method to measure bridge deflection: using the good directionality of the laser, the laser fixed at the measured point of the bridge changes with the deflection of the bridge, and the center of the laser spot irradiated on the CCD also changes accordingly. The center position ...

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Problems solved by technology

[0006] However, because they are easily affected by background stray light, the laser method, laser image method and photoelectric imaging method are only effective in the occasions with a short distance and good weather conditions, and high-precision detection in other situations cannot be realized

At the same time, since the bridge deflection cannot be monitored online for a long time, it brings certain obstacles to the real-time prevention and accurate detection of bridge detection

[0007] Disadvantages of existing deformation detection devices and methods: greatly affected by weather changes and air turbulence, the detection accuracy is not high, and long-term online monitoring is not possible

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