Influence of surface material on the quality of laser triangulation digitized point clouds for reverse engineering tasks

Blanco, David; Fernández, Pedro; Cuesta, E.; Mateos, S.; Beltrán, Natalia

doi:10.1109/etfa.2009.5347115

Cited by 13 publications

(7 citation statements)

References 3 publications

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“…Apart from the equipment’s own parameters and specific tests [ 1 , 5 , 6 ], other parameters have also been taken into account, such as scanning speed [ 7 ] and scanning strategy [ 8 , 9 ]. Moreover, external parameters, like those derived from the part or object acting as the measurand, such as the material [ 10 , 11 ], color, surface roughness [ 12 , 13 ], ambient light [ 14 ], or even the type of the geometry to scan [ 3 , 15 , 16 ]. The idea is to assess the measurements that can be made with these non-contact technologies, thus extending their application beyond typical reverse engineering applications to metrological (GD & T inspection) ones.…”

Section: Introductionmentioning

confidence: 99%

Testing the Sandblasting Process in the Manufacturing of Reference Spheres for Non-Contact Metrology Applications

2021

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To ensure that measurements can be made with non-contact metrology technologies, it is necessary to use verification and calibration procedures using precision artefacts as reference elements. In this environment, the need for increasingly accurate but also more cost-effective calibration artefacts is a clear demand in industry. The aim of this work is to demonstrate the feasibility of using low-cost precision spheres as reference artefacts in calibration and verification procedures of non-contact metrological equipment. Specifically, low-cost precision stainless steel spheres are used as reference artefacts. Obviously, for such spheres to be used as standard artefacts, it is necessary to change their optical behavior by removing their high brightness. For this purpose, the spheres are subjected to a manual sandblasting process, which is also a very low-cost process. The equipment used to validate the experiment is a laser triangulation sensor mounted on a Coordinate Measuring Machine (CMM). The CMM touch probe, which is much more accurate, will be used as a device for measuring the influence of sandblasting on the spheres. Subsequently, the influence of this post-processing is also checked with the laser triangulation sensor. Ultimately, the improvement in the quality of the point clouds captured by the laser sensor will be tested after removing the brightness, which distorts and reduces the quantity of points as well as the quality of the point clouds. In addition to the number of points obtained, the parameters used to study the effect of sandblasting on each sphere, both in contact probing and laser scanning, are the measured diameter, the form error, as well as the standard deviation of the point cloud regarding the best-fit sphere.

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Section: Introductionmentioning

confidence: 99%

Testing the Sandblasting Process in the Manufacturing of Reference Spheres for Non-Contact Metrology Applications

2021

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“…The advantages and disadvantages of the laser triangle method are shown in Table 2 [9]. The effects that can cause laser triangle sensors to read correctly and accurately and to fail them in a short period are shown in Table 3 [10].…”

Section: The Proposed Methodsmentioning

confidence: 99%

Methods and Means of Increasing the Accuracy of Determining the State of the Object

BUNYATOVA¹

2021

International Journal of 3D Printing Technologies and Digital Industry

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In order to determine the state of the object, the distance to it, inclination, density, etc. various types of sensors setting parameters with high accuracy, as well as methods and means to increase the accuracy of setting these parameters are presented in the article. The types of the presented sensors, the principles of operation, areas of application have been comparatively analyzed, their classification has been considered and their pros and cons have been analyzed. Among the considered methods, a complex method with laser sensors, which is an expedient method for determining the distance to the object with high accuracy, has been proposed, the principle-structural model, areas of application, features, advantages and disadvantages of the functional model have been analyzed. The proposed method with high temperature stability determines the distance to the object, inclination, density, etc. the possibility of measurement is shown. The optical system, which uses a laser source and sensors being capable of taking measurements in the visible range, is accompanied by perfect control based on sensor circuits and processing microcontrollers to achieve optimal results in the complex measurement and control process that allows determining the characteristic parameters with high accuracy that set the state of a high object.

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“…The results of a specific study on the influence of ambient lighting on the quality of laser scanner-based measurements on different typology of materials with the same surface treatment were reported [9]. Best results, in terms of less variability and more available data, were generated by using mercury vapour lamps instead of halogen illumination.…”

Section: Introductionmentioning

confidence: 93%

On the influence of scanning factors on the laser scanner-based 3D inspection process

Gerbino

Giudice

Staiano

et al. 2015

Int J Adv Manuf Technol

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3D inspection process is getting more and more interest for manufacturing industries as it helps to carefully check the expected quality of the released products. Much more attention is oriented to optical devices able to quickly capture the whole shape of the product providing many useful information on the process variability and the deliverability of the key characteristics linked to the quality of the product/process. Although the optical control of 3D scanners is mature enough, many factors may influence the quality of the scanned data. These factors may be strictly related to internal elements to the acquisition device, such as scanner resolution and accuracy, and external to it, such as proper selection of scanning parameters, ambient lighting and characteristics of the object surface being scanned (e.g. surface colour, glossiness, roughness, shape), as well as the sensor-to-surface relative position. For the 3D laser-based scanners, the most common on the market, it would be of great industrial interest to study some scanning factors mainly affecting the quality of the 3D surface acquisitions and provide users with guidelines in order to correctly set them so to increase the massive usage of these systems in the product inspection activities. In this context, by using a commercial triangulation 3D laser scanner, the effects of some scanning factors that may affect the measurement process were analysed in the present paper. Working on a sheet metal test part, more complex than the ones commonly used in laboratory and documented in the literature, the scanner-to-object relative orientation and the ambient lighting, as well as an internal scanner parameter, were tested. Through a Design of Experiments (DoE) approach, and setting root mean square error (RMSE) as response function, the outcomes of the tests mainly pointed out that the scanner-to-object relative orientation as well as its position within the field of view of the measurement device are the key factors mostly influencing the accuracy of the measurement process

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Influence of surface material on the quality of laser triangulation digitized point clouds for reverse engineering tasks

Cited by 13 publications

References 3 publications

Testing the Sandblasting Process in the Manufacturing of Reference Spheres for Non-Contact Metrology Applications

Testing the Sandblasting Process in the Manufacturing of Reference Spheres for Non-Contact Metrology Applications

Methods and Means of Increasing the Accuracy of Determining the State of the Object

On the influence of scanning factors on the laser scanner-based 3D inspection process

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