Random laser speckle pattern projection for non-contact vibration measurements using a single high-speed camera

Etchepareborda, Pablo; Moulet, Marie-Hélène; Melon, Manuel

doi:10.1016/j.ymssp.2021.107719

Cited by 23 publications

(6 citation statements)

References 25 publications

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“…However, since the emergence of infrared lasers, many surfaces can be measured without specific preparation. DIC requires a speckle/ random pattern that is painted or projected onto the surface 79 and is applicable to more complex 3D geometries. www.nature.com/scientificreports/ Deflectometry measures mirror-like surfaces, but with adapted infrared cameras, some metallic surfaces may be inspected with almost no preparation.…”

Section: Discussionmentioning

confidence: 99%

Comparison of three full-field optical measurement techniques applied to vibration analysis

O'Donoughue

Gautier

Meteyer

et al. 2023

Sci Rep

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Digital image correlation, deflectometry and digital holography are some of the full-field optical measurement techniques that have matured in recent years. Their use in vibroacoustic applications is gaining attention and there is a need for cataloging their performance in order to provide, to a broad community of users and potential future users, quantitative and qualitative evaluations of these three approaches. This paper presents an experimental comparison of the three optical methods in the context of vibration measurements, along with classical reference measurements provided by an accelerometer and a laser Doppler vibrometer. The study is carried out on two mechanical structures exhibiting various vibration responses when submitted to an impact.

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Section: Discussionmentioning

confidence: 99%

Comparison of three full-field optical measurement techniques applied to vibration analysis

O'Donoughue

Gautier

Meteyer

et al. 2023

Sci Rep

Self Cite

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“…There is a rich literature that develops the method and the range of applications. How, is mentioned in several references, such as [20][21][22]. Video Image Correlation (VIC) has proven to be an excellent method for analyzing the deformations and stresses that occur in a structure.…”

Section: Methodsmentioning

confidence: 99%

“…Video Image Correlation (VIC) has proven to be an excellent method for analyzing the deformations and stresses that occur in a structure and there is a rich literature that develops the method and the range of applications [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Video Image Correlation-Based Method Used for the Study of the Torsional Vibrations of an Adder Gearbox

et al. 2021

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In this paper, a study of the vibrations that appear in the transmission shafts of an adder gearbox used for a heavy truck is made. The truck has two engines on only one chassis and the power offered by these engines is summated and transmitted to the truck or the working machine. This type of transmission is used for oil production installation for the army. During the transportation of the installation to the workplace, only one engine is running, after mounting installation, both engines are running. This paper studies the vibrations of the adder gearbox, a complex construction, subjected to multiple operating requirements. In this regard, the authors first performed accuracy (accuracy) tests of the VIC 3D system on an original experimental mini-stand. Measurements performed on a mini disc demonstrated the validity and accuracy of the method, even if the cameras used were not high resolution. The authors applied the same principle in the case of the adder box from the truck, obtaining useful results for those in the field. The experimental method uses the facilities of a contactless optical measurement method (VIC-3D), which provides a high-accuracy quantitative linear and angular vibration analysis. The VIC measurement method offers, based on a frontal viewing of the disk during the resonance phenomenon and by simple calculus on the monitored linear displacements, the corresponding angular amplitude.

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“…For the inconsistency between the results of visual inspection and the accelerometer output, this paper uses the normalization operation to unify the units after comprehensive consideration. The normalized root mean square error (NRMSE) is used to quantitatively compare the displacement curve obtained by the algorithm with the accelerometer sensor's error, as shown in the following equation (14). The detailed data of the ablation experiment is shown in table 2.…”

Section: Network Model Ablation Experimentsmentioning

confidence: 99%

“…In recent years, structural monitoring and displacement measurement methods based on computer vision have continuously emerged [1][2][3][4][5][6][7][8][9][10][11] and verified in practical engineering applications of mechanical, civil, aviation, and other structures [12][13][14][15][16][17][18]. These methods aim to acquire an image sequence of the structured surface and achieve precise non-contact displacement measurement using a vision sensor [19].…”

Section: Introductionmentioning

confidence: 99%

A single-stage anchor-free rotating target visual detection algorithm suitable for flexible body vibration displacement measurement

Li,

Wang,

Liu

et al. 2024

Meas. Sci. Technol.

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The phenomenon of angular inclination of flexible structures during vibration poses a significant challenge to the applicability of visual vibration measurement methods because the target locked in the captured image will produce unknown geometric deformations such as scale, displacement, and angle in the time domain space, and the horizontal rectangular frame used for matching during target detection will also increase the false detection rate of the target due to the introduction of more background information. Such subtle geometric deformations and false detections can lead to severe fit errors in the displacement curves regressed by the visual vibration measurement algorithm. To effectively improve the accuracy and robustness of vibration image target recognition, this article takes the flexible body captured by a high-speed camera as the target of vibration displacement measurement. It introduces the rotating target detection method based on deep learning into the field of visual vibration measurement, which verifies the feasibility of the deep learning method in flexible body vibration measurement, and based on the deep convolutional neural network framework, a high-precision displacement measurement algorithm based on single-stage anchor-free rotating target detection is proposed. The algorithm in this article first uses the CSPDarknet backbone network to extract multi-scale features of flexible structural image sequences. It then uses PANet to fuse the top-down and bottom-up bidirectional feature maps of the four bridge target feature maps obtained through the backbone network. The shallow and deep information is used for semantic feature fusion and combined with the Coordinate Attention mechanism to achieve target finding and fine positioning on the feature map. Finally, we use the coordinates of the bounding box obtained from the test to regress the position offset of the object's center point. To verify the accuracy of the algorithm in this article, we conducted experimental validation on the cable-stayed bridge model and the actual bridge and compared the performance with the traditional template matching algorithm, differential optical flow method, and various deep learning algorithms with different localization principles, as well as the displacement signals collected and processed by accelerometers. The experimental results of time-frequency characteristics analysis show that the vibration displacement trajectories regressed by the algorithm in this paper have the best overlap with the displacement measurements collected by the accelerometer, which verifies that the algorithm in this article has good application potential and implementation space in the field of condition monitoring of flexible structural bodies.

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Random laser speckle pattern projection for non-contact vibration measurements using a single high-speed camera

Cited by 23 publications

References 25 publications

Comparison of three full-field optical measurement techniques applied to vibration analysis

Comparison of three full-field optical measurement techniques applied to vibration analysis

Video Image Correlation-Based Method Used for the Study of the Torsional Vibrations of an Adder Gearbox

A single-stage anchor-free rotating target visual detection algorithm suitable for flexible body vibration displacement measurement

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