A Novel Laser and Video-Based Displacement Transducer to Monitor Bridge Deflections

Cabrera, Miguel; González, Dorys C.; Mínguez, Jesús; Schumacher, Thomas

doi:10.3390/s18040970

Cited by 44 publications

(14 citation statements)

References 36 publications

(37 reference statements)

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“…In 2017, Miyamoto from Switzerland studied a health monitoring system based on buses in damage detection of bridge structures. In 2018, Miguel A. Vicente et al used cameras and lasers unfixed to monitor bridge structures.…”

Section: Introductionmentioning

confidence: 99%

Middle displacement monitoring of medium–small span bridges based on laser technology

Zhang

Liu

et al. 2020

Struct Control Health Monit

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Summary The safe operation of bridges in service is a worldwide problem; thus, it is significant to ensure the health and stability of bridge structures. For large bridges, considerable progresses have been made in theoretical research and monitoring system. Since the inherent characteristics of medium–small span bridges, such as low cost and minute deformation, the methods applied to large bridges are not suitable for them. Therefore, this paper presents a new method that offers low cost, real‐time dynamic monitoring, and simple equipment for monitoring medium–small span bridges. In addition, a new device called tilt angle elimination device is designed to eliminate the influence of inclination. Based on laser projection technology and image processing technology, we employ laser and charge‐coupled device camera to monitor. Then we validate the effectiveness of new method by conducting a series of experiments. Results show that the new method and device have good utility. To sum up, this displacement monitoring method can provide reference data for the performance evaluation of bridges, which is valuable in the diagnosis of bridges.

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Section: Introductionmentioning

confidence: 99%

Middle displacement monitoring of medium–small span bridges based on laser technology

Zhang

Liu

et al. 2020

Struct Control Health Monit

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“…Vision-based methods offer a good substitute to bridge deflection measurement. Vicente et al [14] presented a new laser-and video-based displacement transducer for monitoring of structural displacements and rotations. The proposed system combines laser beams, LED lights, and a digital video camera.…”

Section: Introductionmentioning

confidence: 99%

A Plastic Optical Fiber Sensing System for Bridge Deflection Measurement

Yang

Wang

Ren

et al. 2020

Sensors

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Deflection is one of the key parameters that reflects the state of a bridge. However, deflection measurement is difficult for a bridge that is under operation. Most existing sensors and measuring techniques often do not meet the requirements for health monitoring for various types of bridges. Therefore, based on changes of optical fiber intensity, a novel sensing system using connected pipes to measure bridge deflection in different positions is proposed in this paper. As an absolute reference, the liquid level position along the structure is adopted for the deflection measurement, and an additional external reference to the ground is not needed in this system. The proposed system consists of three parts: connected pipes to connect the measurement points along the structure, liquid to fill in the connected pipes, and the sensing element to detect the change of level. A plastic optical fiber sensor based on the intensity change is used as the sensing element of the developed system. Then, a set of experimental tests are conducted for performance evaluation purposes. Results show that this system has an accurate linear response and high reliability under various environmental conditions. The deflection of the test beam measured by the sensor agrees with linear variable differential transformer (LVDT) within an error margin of 2.1%. The proposed system shows great potential applicability for future health monitoring of long-span bridges.

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“…However, this monitoring method needs to use GNSS and can only be applied to bridges’ deflection monitoring. Vicente et al (2018) designed a displacement monitoring system for bridges. They projected two lasers onto the same screen.…”

Section: Introductionmentioning

confidence: 99%

Displacement monitoring method based on laser projection to eliminate the effect of rotation angle

Liu

Zhang

et al. 2019

Advances in Structural Engineering

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Currently, laser technology has become increasingly mature. Semiconductor lasers have the characteristics of small size, long indication distance, long life, and low cost. Therefore, many studies regard them as the launching devices of monitoring system and fix them at the monitoring points of structures to reflect the displacements of the monitoring points through the spots produced by them. However, this method also exhibits a drawback, that is, this method can only be applied to the case where only displacement is generated at the monitoring point and no rotation angle is generated. If the rotation occurs at the monitoring point, the spot displacement is caused by the coupling effect of the displacement and rotation angle at the monitoring point, which will affect the monitoring results significantly. In this article, a method is proposed to decouple the effect of the displacement and angle and eliminate the influence of the angle sufficiently, by projecting the laser spots onto two screens. This method can significantly improve the application scope of the monitoring system and provide the possibility for its application in practical engineering.

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A Novel Laser and Video-Based Displacement Transducer to Monitor Bridge Deflections

Cited by 44 publications

References 36 publications

Middle displacement monitoring of medium–small span bridges based on laser technology

Middle displacement monitoring of medium–small span bridges based on laser technology

A Plastic Optical Fiber Sensing System for Bridge Deflection Measurement

Displacement monitoring method based on laser projection to eliminate the effect of rotation angle

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