Bridge dynamic deflection facula imaging measuring device and method

Abstract

Provided is a bridge dynamic deflection facula imaging measuring device and a method. A blue light-emitting diode (LED) lamp is arranged at the position of a deflection measure point of a structure to be measured, light is processed by a charge coupled device (CCD) in a photoelectrical coupling mode after passing through a filtering and central-long focus lens, optical signals of the deflection measure point of the structure to be measured are converted into picture signals to be transmitted to a computer which works out a location value of a facula corresponding to the LED lamp on a receiving screen, then the position value of the deflection measure point of the structure to be measured is calculated, and bridge dynamic deflection measurement in a bridge measurement and health monitoring process is achieved.

Description

technical field [0001] The invention relates to a bridge dynamic deflection spot imaging measurement device and method, belonging to the technical field of bridge detection and monitoring. Background technique [0002] In the process of bridge inspection and health monitoring, the deflection of the bridge is an important parameter that is very concerned about the three key issues of strength, stiffness, and stability of the bridge structure. The force characteristics have important theoretical value, therefore, the precision and accuracy of deflection measurement is very important. Under this demand, researchers at home and abroad have developed many new deflection measurement methods, among which the representative ones are: dial indicator method, connected pipe method, level method, GPS deflection measurement method, and laser method. They all have some problems and deficiencies to varying degrees, and are basically suitable for static deflection measurement. Therefore, c...

AI Technical Summary

Problems solved by technology

There are a few methods in the prior art that can measure the dynamic deflection of bridges. The method most similar to the present invention is to use a white LED light as a light source, and use a CCD to collect images behind the telescope eyepiece of the theodolite to measure the dynamic deflection, but this method has the following defects : 1. The white light source is easily interfered by strong sunlight during the day, and interfered by external light sources such as car lights, street lights, and construction site searchlights at night, resulting in large errors in measurement and affecting the actual measurement effect; 2. The optical path is after passing through the telescope. After passing through the atmosphere and then through the conventional lens and CCD imaging, that is to say, it has passed through the imaging system twice, which reduces the resolution and range, and the measurement effect and accuracy are not as good as the conventional lens and one-time imaging.

Images