Diameter Measurement of Spherical Objects by Laser Triangulation in an Ambulatory Context

Demeyere, M.; Rurimunzu, D.; Eugène, Christian

doi:10.1109/tim.2007.894884

Cited by 27 publications

(11 citation statements)

References 6 publications

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“…Looking at other fields of application of vision and laser based scanning, a lot of research has been carried out with facial recognition [20][21], dimensional measurement of objects [22] and even for inspection and control of quality purposes [23][24]. Kwok et al proposes a laser based system to collect 3D data around the surface of a turbine blade.…”

Section: Proposed Architecture and Technologiesmentioning

confidence: 99%

A low-cost laser scanning solution for flexible robotic cells: spray coating

Ferreira

Moreira

Neto

2011

Int J Adv Manuf Technol

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In this paper, an adaptive and low-cost robotic coating platform for small production series is presented. This new platform presents a flexible architecture that enables fast/automatic system adaptive behaviour without human intervention. The concept is based on contactless technology, using artificial vision and laser scanning to identify and characterize different workpieces travelling on a conveyor. Using laser triangulation the workpieces are virtually reconstructed through a simplified cloud of 3D points. From those reconstructed models several algorithms are implemented to extract information about workpieces profile (pattern recognition), size, boundary and pose. Such information is then used to on-line adjust the "base" robot programs. These robot programs are off-line generated from a 3D computer-aided design (CAD) model of each different workpiece profile. Finally, the robotic manipulator executes the coating process after its "base" programs have been adjusted. This is a low-cost and fully autonomous system that allows adapting the robot's behaviour to different manufacturing situations. It means that the robot is ready to work over any piece at any time, and thus, small production series can be reduced to as much as a one-object-series. No skilled workers and large setup times are needed to operate it. Experimental results showed that this solution proved to be efficient and can be applied not only for spray coating purposes but also for many other industrial processes (automatic manipulation, pick-and-place, inspection, etc.). 2

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Section: Proposed Architecture and Technologiesmentioning

confidence: 99%

A low-cost laser scanning solution for flexible robotic cells: spray coating

Ferreira

Moreira

Neto

2011

Int J Adv Manuf Technol

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“…The principle of laser triangulation has been used to measure the elevation or depth [ 7 , 8 ] on a surface. The laser source beam projected on a surface has a certain rayon when observed with a camera [ 9 , 10 , 11 , 12 ]. In laser triangulation, the laser spot projected on a surface behaves as the reference [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

A Scheme for Enhancing Precision in 3-Dimensional Positioning for Non-Contact Measurement Systems Based on Laser Triangulation

Selami

Tao

Gao

et al. 2018

Sensors

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Abstract:Laser triangulation allows non-contact measurement in the third dimension. Due to the nonlinearities presented in camera and laser sensor, large range distances are quite difficult to measure with high precision. In order to enhance the precision and accuracy of large range measurement based on laser triangulation, we propose a novel scheme composed of four laser emitters, curve fitting subpixel location algorithm for laser center detection, and the linear regression approach based on the Gaussian model for calibration. When an object performs a 100 mm displacement from a closer to a farther point, our system achieved a repeatability up to ±7 µm, an estimated standard deviation of fitting error within 0.0027 mm, an expanded uncertainty of repeatability within 0.13 mm, an average error variation of rotational plane within 0.15 degree and a nonlinearity error within ±0.04% in full scale. Compared to published results, our proposed method shows an enhancement in accuracy. The error is significantly reduced and maintains at the low level for large ranges, which makes this system applicable and suitable for industrial and indoor applications.

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“…Michael Demeyere et al proposed a method for robust noncontact diameter determination of spherical objects based on laser triangulation. Experiment results showed that accuracy is about 1% for spherical objects of in diameter [25]. However, traditional triangulation probes suffer from a serious drawback of occlusion; namely, shadings exist in a scene due to spatial structure of objects, which is commonly seen on objects with step surfaces, free-form surfaces, cavities, etc.…”

Section: Introductionmentioning

confidence: 99%

On-Machine Optical Probe Based on Discrete Rotational Symmetric Triangulation

Zhang

Wang

Fei³

et al. 2018

Mathematical Problems in Engineering

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In the field of modern manufacturing, probes have been playing a more and more crucial role. However, contact probes are unfit for measuring objects with soft surfaces or very tiny cavities and require radius compensation of stylus. In comparison, noncontact probes such as optical probes do not have to consider these problems and are well-performed in measurement. However, existing optical probes (triangulation) may fail to detect objects with rich spatial structures (due to the occlusion effect) and highly reflective curved surfaces (due to existence of highlight spots). Considering the problems, an optical probe based on discrete rotational symmetric triangulation is proposed in this paper. The emitting laser beam of the probe is the rotational axis and the five receiving optical paths (lenses and mirrors) are rotationally symmetrically distributed around the laser axis and are coimaged on a CMOS camera. Results of simulations and experiments show that the new-established prototype is designed with good robustness under various conditions such as different surface characteristics and different inclination degrees. The probe enables conducting real-time on-machine measurement without directional dependency with a resolution of 39 μm and repeatability accuracy of 0.72 μm.

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Diameter Measurement of Spherical Objects by Laser Triangulation in an Ambulatory Context

Cited by 27 publications

References 6 publications

A low-cost laser scanning solution for flexible robotic cells: spray coating

A low-cost laser scanning solution for flexible robotic cells: spray coating

A Scheme for Enhancing Precision in 3-Dimensional Positioning for Non-Contact Measurement Systems Based on Laser Triangulation

On-Machine Optical Probe Based on Discrete Rotational Symmetric Triangulation

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