In-plane and out-of-plane deformation and vibration measurement using an optomechanical image derotator

Rahlves, Maik; Mirzaei, Sahar; Fahlbusch, T.; Reithmeier, Eduard

doi:10.1117/12.825254

Cited by 6 publications

(1 citation statement)

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“…1. The derotator has a wide range of potential applications in dynamic inspection 1,2 and vibration monitoring 3,4 of objects with high rotational speeds. The core component of the derotator is a Dove 5 or reflector prism 6 .…”

Section: Introductionmentioning

confidence: 99%

Rotation axis estimation for the derotator calibration with machine vision measurement of the auxiliary laser

Yin

Altmann

Pape

et al. 2018

Optical Metrology and Inspection for Industrial Applications V

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A key problem when using the derotator is to ensure the coaxial alignment between the optical axis of the derotator and the rotation axis of the measured object. Moreover, accurate measurement of the rotation axis is the prerequisite of achieving the coaxial alignment. In this paper, we propose a strategy for estimation of the rotation axis with the assistant of an auxiliary laser and a binocular stereo vision sensor. When a laser source is temporarily attached to the measured object or the rotor shaft, the rotation of the laser will generate a ruled surface. The binocular sensor can accurately measure the coordinates of laser dots in three-dimensional (3D) space. The pose vector of the laser in each certain rotation angle can be estimated with measured 3D coordinates of the laser dots. Finally, the rotation axis of the object can be estimated with multiple pose vectors considering the constraint of the fixed axis rotation. The validity and precision of this proposed strategy are demonstrated by means of experiments.

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Section: Introductionmentioning

confidence: 99%

Rotation axis estimation for the derotator calibration with machine vision measurement of the auxiliary laser

Yin

Altmann

Pape

et al. 2018

Optical Metrology and Inspection for Industrial Applications V

Self Cite

View full text Add to dashboard Cite

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Image-based discrete-time optimal feedback control for an optomechanical derotator

2018

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Optical derotator alignment using image-processing algorithm for tracking laser vibrometer measurements of rotating objects

Khalil

Kim

et al. 2017

Review of Scientific Instruments

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An optical component called a Dove prism is used to rotate the laser beam of a laser-scanning vibrometer (LSV). This is called a derotator and is used for measuring the vibration of rotating objects. The main advantage of a derotator is that it works independently from an LSV. However, this device requires very specific alignment, in which the axis of the Dove prism must coincide with the rotational axis of the object. If the derotator is misaligned with the rotating object, the results of the vibration measurement are imprecise, owing to the alteration of the laser beam on the surface of the rotating object. In this study, a method is proposed for aligning a derotator with a rotating object through an image-processing algorithm that obtains the trajectory of a landmark attached to the object. After the trajectory of the landmark is mathematically modeled, the amount of derotator misalignment with respect to the object is calculated. The accuracy of the proposed method for aligning the derotator with the rotating object is experimentally tested.

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In-plane and out-of-plane deformation and vibration measurement using an optomechanical image derotator

Cited by 6 publications

References 0 publications

Rotation axis estimation for the derotator calibration with machine vision measurement of the auxiliary laser

Rotation axis estimation for the derotator calibration with machine vision measurement of the auxiliary laser

Image-based discrete-time optimal feedback control for an optomechanical derotator

Optical derotator alignment using image-processing algorithm for tracking laser vibrometer measurements of rotating objects

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