A comparison of precision optical displacement sensors for the 3D measurement of complex surface profiles

Boltryk, Peter; Hill, Martyn; McBride, J.W.; Nascè, Antony

doi:10.1016/j.sna.2007.03.006

Cited by 23 publications

(11 citation statements)

References 4 publications

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“…Three-dimensional reconstruction can be applied in several fields such as: manufacturing processes [9], metrology [10], robotics [11], biology [12] [2, 13], topography [14], computer-aided design [15], archaeological [4], simulation [16] and scientific visualization [17] as examples. There are many techniques that have been successfully applied for the 3D reconstruction of small objects, such as laser scanners [3], X-ray Tomography [18], microscopy [1], which involves the use of expensive, but not very versatile equipment.…”

Section: Overviewmentioning

confidence: 99%

Accurate 3D Reconstruction using a Turntable-based and Telecentric Vision

González-Barbosa

Rico-Espino²,

Gómez-Loenzo

et al. 2015

Automatika

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Original scientific paperThis paper presents a camera+telecentric lens that is able to obtain 3D information. We designed and implemented a method which can register and integrate 3D information captured from different viewpoints to build a complete 3D object model. First, a geometric model of a camera+telecentric lens is established. Then a calibration process using a planar checkerboard is developed and implemented. The object is placed on a rotation stage in front of a stationary camera. Normally the rotation axis is considered to be aligned with camera frame. In the description presented in this paper, the rotation matrix and translation vector of the rotation axis are calibrated. At the same time, a three-dimensional reconstruction system based on contour extraction of objects with dimensions less than 50 mm in diameter is developed. Finally, an analysis of the uncertainty model parameters and performance reconstruction of 3D objects are discussed.Key words: Calibration, 3D Reconstruction, Telecentric lens Točna 3D rekonstrukcija zasnovana na rotirajućoj platformi i telecentričnoj viziji.Članak prestavlja sustav koji se sastoji od kamere i telecentrične leće koji omogućavaju dobivanje 3D informacije o objektu. Dizajnirana je i implementirana metoda koja može registrirati i integrirati 3D informacije iz različitih točaka gledišta, kako bi se izgradio potpuni 3D model. Na početku, uspostavlja se geometrijski model kamere i telecentrične leće. Nakon toga koristi se razvijena metoda kalibracije zasnovana na šahovskoj ploči te se objekt postavlja na rotirajuću platformu ispred stacionarne kamere. Takoîer, pretpostavlja se da je os rotacije poravnta s koordinantim sustavom kamere. U ovomečlanku kalibriraju se rotacijska matrica i translacijski vektor rotacijske osi. Razvijen je i sustav 3D rekonstrukcija zasnovan na izlučivanju kontura objekta dimenzija manjih od 50 mm u promjeru. Na kraju, provedena je i analiza nesigurnosti parametara modela kao i točnost rekonstrukcije 3D modela.

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Section: Overviewmentioning

confidence: 99%

Accurate 3D Reconstruction using a Turntable-based and Telecentric Vision

González-Barbosa

Rico-Espino²,

Gómez-Loenzo

et al. 2015

Automatika

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“…Sound encoded in the grooves as displacement modulations have been observed to contain spectra with sub50nm amplitudes [5]. To resolve displacement modulations to this scale requires a high resolution displacement sensor, with a recommended axial resolution of at least 10-20nm.…”

Section: Specific System Metrology Demandsmentioning

confidence: 99%

“…In [5], the relative performances of commercial WL and CL sensors were compared on a reference cylinder machined with grooves, and on a 4 minute Blue Amberol cylinder recording (cylinder reference #1). A common observation when comparing groove cross-sections as measured by the two competing sensors was the slight discrepancy in implied shape for nominally identical grooves.…”

Section: Sensor Developmentsmentioning

confidence: 99%

“…This process also allows badly deformed recordings to be played, where stylus playback would not be possible. Extremely high sensor axial resolution is required to resolve the smallest amplitude groove modulations contained on typical cylinder artefacts [5]. For this reason, the project has selected confocal laser and white light (polychromatic) confocal sensors as suitable sensing technologies, and rejected the popular laser triangulation sensor for this application based on its inability to resolve typical groove cross-sections and its more limited axial resolution.…”

Section: Introductionmentioning

confidence: 99%

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Comparing laser and polychromatic confocal optical displacement sensors for the 3D measurement of cylindrical artefacts containing microscopic grooved structures

Boltryk

Hill

McBride

2009

Wear

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A scanning system has been developed for measuring the surface of early cylinder mechanical sound recordings to high precision, both for surface preservation and for post-processing of the data to recover the sound encoded in the grooves. Research has identified that high sensor axial resolution is required to resolve the smallest amplitude groove modulations contained on typical cylinder artefacts resulting in the selection of confocal laser and white light (polychromatic) confocal sensors as suitable sensing technologies. This paper presents data acquired by the two confocal sensor technologies, comparing the measured surface profiles with data obtained using a stylus profilometer. We investigate limitations of the sensors, relating their characteristics to the ongoing development of the scanning system.

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“…Different from [11,12], the measuring unit utilizes the layout of pneumatic micrometer, and this arrangement cannot be affected by dynamic factors. To overcome the short range of pneumatic micrometer, LTSs [20,21,22], which have the advantage of high accuracy and wide measuring range, are employed in our system to acquire raw data. The measuring principle of LTS is introduced in Section 2.…”

Section: Introductionmentioning

confidence: 99%

A Laser-Based Measuring System for Online Quality Control of Car Engine Block

Wang

2016

Sensors

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For online quality control of car engine production, pneumatic measurement instrument plays an unshakeable role in measuring diameters inside engine block because of its portability and high-accuracy. To the limitation of its measuring principle, however, the working space between the pneumatic device and measured surface is too small to require manual operation. This lowers the measuring efficiency and becomes an obstacle to perform automatic measurement. In this article, a high-speed, automatic measuring system is proposed to take the place of pneumatic devices by using a laser-based measuring unit. The measuring unit is considered as a set of several measuring modules, where each of them acts like a single bore gauge and is made of four laser triangulation sensors (LTSs), which are installed on different positions and in opposite directions. The spatial relationship among these LTSs was calibrated before measurements. Sampling points from measured shaft holes can be collected by the measuring unit. A unified mathematical model was established for both calibration and measurement. Based on the established model, the relative pose between the measuring unit and measured workpiece does not impact the measuring accuracy. This frees the measuring unit from accurate positioning or adjustment, and makes it possible to realize fast and automatic measurement. The proposed system and method were finally validated by experiments.

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A comparison of precision optical displacement sensors for the 3D measurement of complex surface profiles

Cited by 23 publications

References 4 publications

Accurate 3D Reconstruction using a Turntable-based and Telecentric Vision

Accurate 3D Reconstruction using a Turntable-based and Telecentric Vision

Comparing laser and polychromatic confocal optical displacement sensors for the 3D measurement of cylindrical artefacts containing microscopic grooved structures

A Laser-Based Measuring System for Online Quality Control of Car Engine Block

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