2-D, large range laser deflection / displacement measuring method and apparatus

Abstract

The present invention relates to a two-dimension large-range laser displacement / deflection measuring equipment and its measuring method. Said equipment includes laser transmitting portion and two-dimension laser speckle receiving and measuring portion. The laser transmitting portion is formed-form laser and mounting frame, and said laser mounting frame is a variable damping hinge structure, and the two-dimension laser speckle receiving and measuring portion consists of receiving screen, camera and luminous or non-luminous mark. Said invention also provides the concrete steps of its measurement method.

Description

technical field [0001] The invention belongs to the intersection field of the field of photoelectric measurement and the state monitoring field of civil infrastructure, and specifically relates to a two-dimensional large-range laser displacement / deflection measurement device and method. technical background [0002] The vertical and lateral deformation of beams of bridges and other building structures under the action of self-weight and load is called deflection; while the lateral deformation of bridge towers under the action of cables and wind loads is called displacement, which is generally measured by the relative distance between the top of the tower and the base of the tower. The displacement representation of is collectively referred to as displacement below. Displacement can directly reflect the construction quality, bearing capacity, and health of the structure. Therefore, there are strict regulations in the design of bridges, construction qua...

AI Technical Summary

Problems solved by technology

[0007] 1. For large bridges, especially cable-stayed bridges and suspension bridges, the displacement is very large, usually on the order of about 1 meter, and the range of 20-30 cm is far from enough;

[0008] 2. The displacement of the bridge is usually two-dimensional. During the long-term monitoring process, the light spot irradiated on the detector array will move out of the detector due to the displacement in the other direction, thus making the measurement invalid

[0009] 3 If there are two deformations of displacement and slight rotation at the measured point 2, the emission angle of the laser will change, and this change will be enlarged by rotation, reflecting a large amount of movement of the spot position on the detector array, which will seriously affect the measurement results. accuracy

[0010] These problems make the above two measurement methods flawed, seriously restricting their application in real-time, all-weather, automatic deflection monitoring of bridges

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