Performance evaluation experiments on a laser spot triangulation probe

Muralikrishnan, Balasubramanian; Ren, Wei; Everett, Dennis S.; Stanfield, Eric S.; Doiron, Theodore D.

doi:10.1016/j.measurement.2011.11.012

Cited by 47 publications

(17 citation statements)

References 5 publications

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“…The mean and standard deviation of these point-to-point differences are 1.5 µm and 10 µm, respectively. Most of the large differences happen at the side walls where the non-contact probe measures the surface at a grazing angle and therefore produces larger measurement errors [11]. The small value for the mean difference suggests that there is no bias (or vertical shift) between the two profiles.…”

Section: Comparison and Parameter Evaluationmentioning

confidence: 99%

Applications of profile filtering in the dimensional metrology of fuel cell plates

Muralikrishnan

Ren²,

Stanfield³

et al. 2013

Meas. Sci. Technol.

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We describe the application of several surface profile filters as an enabling tool in the dimensional measurements of an engineering artifact, namely, a fuel cell plate. We recently reported work on the development of a non-contact system for dimensional metrology of bipolar fuel cell plates. That system is comprised of two laser spot triangulation probes that acquire profile data across a plate. While the non-contact system provides rapid measurements (measurement speed of 100 mm/s to 500 mm/s), the data are noisy and cannot be used directly to obtain features of interest such as channel depth and width. In this paper, we show how different surface profile filters such as the spline, morphological, and robust filters, can be employed to identify and suppress outliers and to produce a mean line that serves as a substitute geometry from which we can determine features of interest. Further, we compare the non-contact probe data against contact probe measurements made using a coordinate measuring machine (CMM). Surface profile filters are again useful in correcting the reference data for tip size and also in removing any free form deformation in both data sets prior to parameter evaluation and comparison.

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Section: Comparison and Parameter Evaluationmentioning

confidence: 99%

Applications of profile filtering in the dimensional metrology of fuel cell plates

Muralikrishnan

Ren²,

Stanfield³

et al. 2013

Meas. Sci. Technol.

Self Cite

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“…Over the last years, several studies have shown the importance of the analysis of measurement uncertainties [3,7,11,15,20,21,22,23,24]. Thus, Xi et al [24] indicated that various scanner-to-surface distances and inclination angles raise systematic uncertainties for the used sensor.…”

Section: Introductionmentioning

confidence: 99%

“…While the previous approaches were primarily focused on the imaging geometry or fast and easy performance tests, Muralikrishnan et al [15] exposed and analyzed socalled "hidden performance attributes" (Businaki et al [3]) of a laser triangulation spot probe. For example, they demonstrated the in uence of di erent surface materials on linearity and highlighted the impact on height measurements of two di erent ceramic gauges.…”

Section: Introductionmentioning

confidence: 99%

High-Precision Surface Inspection: Uncertainty Evaluation within an Accuracy Range of 15μm with Triangulation-based Laser Line Scanners

Dupuis

Kuhlmann

2014

Journal of Applied Geodesy

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Triangulation-based range sensors, e.g. laser line scanners, are used for high-precision geometrical acquisition of free-form surfaces, for reverse engineering tasks or quality management. In contrast to classical tactile measuring devices, these scanners generate a great amount of 3D-points in a short period of time and enable the inspection of soft materials. However, for accurate measurements, a number of aspects have to be considered to minimize measurement uncertainties. This study outlines possible sources of uncertainties during the measurement process regarding the scanner warm-up, the impact of laser power and exposure time as well as scanner's reaction to areas of discontinuity, e.g. edges. All experiments were performed using a xed scanner position to avoid e ects resulting from imaging geometry. The results show a signi cant dependence of measurement accuracy on the correct adaption of exposure time as a function of surface re ectivity and laser power. Additionally, it is illustrated that surface structure as well as edges can cause signi cant systematic uncertainties.

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“…The latter approach reduces the effect of nonuniformly distributed light and surface damage, but does not affect speckle related uncertainty. Even simple linear dimensional measurement accuracy of well-defined objects is affected by a number of error sources [11,12]. Undesired secondary reflections from vertical surfaces are proven to present the dominant measurement error source.…”

Section: Introductionmentioning

confidence: 99%

Dynamic symmetrical pattern projection based laser triangulation sensor for precise surface position measurement of various material types

et al. 2013

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This paper describes a custom, material-type-independent laser-triangulation-based measurement system that utilizes a high-quality ultraviolet laser beam. Laser structuring applications demand material surface alignment regarding the laser focus position, where fabrication conditions are optimal. Robust alignment of various material types was solved by introducing dynamic symmetrical pattern projection, and a "double curve fitting" centroid detection algorithm with subsurface scattering compensation. Experimental results have shown that the measurement system proves robust to laser intensity variation, with measurement bias lower than 50 μm and standard deviation lower than ±6.3 μm for all materials. The developed probe has been integrated into a PCB prototyping system for material referencing purposes.

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Performance evaluation experiments on a laser spot triangulation probe

Cited by 47 publications

References 5 publications

Applications of profile filtering in the dimensional metrology of fuel cell plates

Applications of profile filtering in the dimensional metrology of fuel cell plates

High-Precision Surface Inspection: Uncertainty Evaluation within an Accuracy Range of 15μm with Triangulation-based Laser Line Scanners

Dynamic symmetrical pattern projection based laser triangulation sensor for precise surface position measurement of various material types

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