Device and method for measuring structural deflection

Abstract

The invention discloses a device and a method for measuring structural deflection, the device comprises a simple pendulum system, a damping system and an electronic scale, the simple pendulum system comprises a suspender, a laser, a device shell and a lower pendulum part, the laser is installed in the device shell, and when the simple pendulum system is stable, the laser emits a horizontal collimated light beam; the lower pendulum part of the simple pendulum system is placed in the damping system and is used for eliminating vibration by increasing the damping ratio; the electronic scale comprises a leveling rod, an imaging device and a single-chip microcomputer, and the imaging device comprises a lens and an image sensor; the simple pendulum system and the electronic leveling rod are arranged in parallel, the horizontal light beam emitted by the laser device enters the lens and is projected to a photosensitive dot matrix of the image sensor after being zoomed by the lens, and the single-chip microcomputer calculates horizontal or vertical deflection according to data acquired by the image sensor; and the length of the suspender is controlled and adjusted, so that the structural damping of the device is greater than the minimum damping value required for avoiding reciprocating vibration in the free vibration reaction of the system.

Description

technical field [0001] The invention relates to the technical field of dynamic deflection measurement, in particular to a device and method for measuring structural deflection. Background technique [0002] Dynamic deflection measurement is a research hotspot in the industry and academia in recent years, but many dynamic deflection measurement methods and devices have failed to show good results in field measurements. The current bridge dynamic deflection measurement methods include CCD photoelectric method, PSD laser measurement method, seismic vibration sensor to measure dynamic deflection and other methods. (1) The CCD photoelectric method uses photoelectric image method and long-distance imaging technology, photoelectronic technology, digital image processing and related technologies, and uses the principle of photoelectric coupling to measure dynamic and static deflection. It is a long-distance non-contact measurement method. Advantages: high measurement accuracy and q...

AI Technical Summary

Problems solved by technology

Disadvantages: The device is expensive and vulnerable to environmental conditions such as rain and fog

Disadvantages: The measurement accuracy of the detector detection circuit is subject to noise, temperature drift of the circuit and optical system. In practical applications, the measurement will be inaccurate after a large deflection of the measured object occurs

The monitoring system is greatly affected by the weather, and changes in sunlight and other light intensity will affect the accuracy of the device, and the grid-shaped shading plate cannot always be vertical during the monitoring process, and will be offset by the weather, which has great impact on the measurement Accuracy impact is not negligible

CN201921054421.7 proposes a long-distance bridge deflection monitoring device based on the image method. The device is equipped with a laser rangefinder, an optical tilt table, a first L-shaped bracket, a second L-shaped bracket, a dovetail plate, an image acquisition device, and a zoom Telephoto lens, pan / tilt, and tripod are carried out by using image laser with image processing, but this device has high requirements for the precision of each structure, and the equipment price is relatively high

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