Low cost subpixel method for vibration measurement

Espinosa, Julián; Roig, Ana B.; Acevedo, Pablo; Mas, David

doi:10.1063/1.4879584

Cited by 1 publication

(1 citation statement)

References 3 publications

(3 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Jeon et al [ 11 ] applied the image processing to measure the vibration of a beam using a single camera, however, it was limited to 2-D measurement. Belen Ferrer et al [ 12 ] developed a method to measure the vibration using an image processing to detect a sub-pixel movement of a structure. However, this method is limited to measure only the frequency from a 2-D image sequence, and cannot be applied to measure the 3-D dynamic displacement of a structure.…”

Section: Introductionmentioning

confidence: 99%

Measurement of 3-D Vibrational Motion by Dynamic Photogrammetry Using Least-Square Image Matching for Sub-Pixel Targeting to Improve Accuracy

Lee

Rhee

et al. 2016

Sensors

View full text Add to dashboard Cite

This paper deals with an improved methodology to measure three-dimensional dynamic displacements of a structure by digital close-range photogrammetry. A series of stereo images of a vibrating structure installed with targets are taken at specified intervals by using two daily-use cameras. A new methodology is proposed to accurately trace the spatial displacement of each target in three-dimensional space. This method combines the correlation and the least-square image matching so that the sub-pixel targeting can be obtained to increase the measurement accuracy. Collinearity and space resection theory are used to determine the interior and exterior orientation parameters. To verify the proposed method, experiments have been performed to measure displacements of a cantilevered beam excited by an electrodynamic shaker, which is vibrating in a complex configuration with mixed bending and torsional motions simultaneously with multiple frequencies. The results by the present method showed good agreement with the measurement by two laser displacement sensors. The proposed methodology only requires inexpensive daily-use cameras, and can remotely detect the dynamic displacement of a structure vibrating in a complex three-dimensional defection shape up to sub-pixel accuracy. It has abundant potential applications to various fields, e.g., remote vibration monitoring of an inaccessible or dangerous facility.

show abstract

Section: Introductionmentioning

confidence: 99%