Automated dimensional inspection planning using the combination of laser scanner and tactile probe

Zhao, Haibin; Kruth, Jean‐Pierre; Gestel, Nick Van; Boeckmans, Bart; Bleys, Philip

doi:10.1016/j.measurement.2012.01.037

Cited by 87 publications

(40 citation statements)

References 21 publications

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“…Sensor selection for measurement of different features and inspection path planning are the main focuses in this field. Studies of Mohib et al [31] and Zhao et al [32] belong to this field. In…”

Section: Non-contact Blue Led Structured Light Scannermentioning

confidence: 99%

On Development of Methods for Expressing Customer Affective Response for Apparel Products

Zhao¹,

Montazer²,

Wang³

et al. 2015

Proceedings of CAD'15

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In dimensional metrology, contact and non-contact measurement methods each have their own respective strengths and weaknesses. Touch-trigger probes have low uncertainty, and perform well inside deep holes, but have a relatively slow data acquisition speed. By contrast, non-contact digitizers collect high density surface point clouds in seconds, and are much less likely to suffer from sensor collision with the part, but have a higher uncertainty than touch probes. In sheet metal forming, iterative design of the stamping die is needed due to the springback of the sheet metal part. Holes or other features of first article parts may be significantly out of tolerance, so the tactile measurement path created from the Computer Aided Design (CAD) nominal has to be adjusted to avoid cosine error. In more serious cases, probe collisions or missed touches may occur. When measuring holes in thin sheet metal, determination of the touch probe path height is also a challenge if the actual surface location differs from the nominal.To solve this problem and seize the complimentary advantages of contact and non-contact measurement methods, a multi-sensor blue Light Emitting Diode (LED) snapshot sensor and touch-trigger probe inspection system was developed, and affixed to a Coordinate Measuring Machine (CMM). The tactile measurement path was adjusted according to the approximate positions and sizes of the features obtained from the scanner iv data. The system includes an in-house designed calibration target for scanner calibration and a lightweight 2-axis rotary table for multiple-orientation scanning as well. Software in programming language C for interacting with the scanner and the CMM was developed.

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Section: Non-contact Blue Led Structured Light Scannermentioning

confidence: 99%

On Development of Methods for Expressing Customer Affective Response for Apparel Products

Zhao¹,

Montazer²,

Wang³

et al. 2015

Proceedings of CAD'15

View full text Add to dashboard Cite

show abstract

“…Zhao et al outlined a methodology that plans the inspection automatically for CMM with a touch trigger probe and a laser scanner. (12) The methodology is suitable for automatic dimensional measurement. Rahayem et al conducted comparative research including the popular ellipse-fitting methods from the laser profile-scan sections.…”

Section: Introductionmentioning

confidence: 99%

Optimization Solution of Laser Plane Generated from Maximum Likelihood Estimation of Projection Plane

2018

Sensors and Materials

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An enhanced solution method that based on the maximum likelihood estimation (MLE) of the projection plane is proposed. The method utilizes a 2D target and an optimization process to achieve a higher accuracy and noise immunity. The projection plane is parameterized by the laser plane coordinates. The maximum likelihood function is obtained from the stochastic vector of the projection planes in the camera coordinate system. The coordinates of the laser plane are achieved by the optimization process. The MLE method is compared with the original method. The experimental results reveal the relative error reductions of 18.97, 19.81, 21.22, and 21.60% under the test distances of 200, 300, 400, and 500 mm, respectively. Moreover, for the images under noise, the results show the relative error reductions of 20.06, 18.77, 19.64, and 20.35%, respectively. The experimental results suggest that the MLE of the projection plane would be useful to improve the measurement accuracy of active vision in both fundamental research and potential applications.

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“…This can be considered the biggest advantage of those systems as well as the ability to collect full product information without local part deformation during the inspection [8,9]; hence, CMM systems with laser scanners are more frequently being used [6,10]. The use of laser scanners is well-established in the context of reverse engineering, but they are currently unable to achieve the accuracy and repeatability offered by touch trigger probes.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the capability of laser scanning to measure an automotive artefact: a comparison study of touch trigger probe and laser-scanning

Kiraci

Turley

Attridge

et al. 2016

IJPQM

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The increasing interest towards intelligent systems has led to a demand for the development of zero-defect strategies, with a paradigm shift from off-line and dedicated to inline metrology with integrated robotic systems. However, a major barrier preventing the systematic uptake of in-line metrology is the lack of evaluation of system capability in terms of accuracy, repeatability and measurement time, when compared to the well-established coordinate measuring machine (CMM). In this study, a robotic Laser Radar (LR) solution is assessed in the context of automotive dimensional inspection of Body-In-White (BIW) applications. The objective is both to understand the effect of robot re-positioning error on measurement accuracy and repeatability and to compare measurement results against a CMM. Eighty-one surface points, six edge points, twenty-five holes and sixteen slots were selected from an industry standard measurement plan. Whilst LR exhibits a lower measurement accuracy than twin-column CMM, its repeatability is well within the specification limits for body shell quality inspection. Therefore, as a real-time in-line metrology tool, it is a genuine prospect to exploit. This research makes a significant contribution toward in-line metrology for dimensional inspection, for automotive application, for rapid detection and for correction of assembly defects in real time, with subsequent reduction of scrap and number of repairs/re-works.

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Automated dimensional inspection planning using the combination of laser scanner and tactile probe

Cited by 87 publications

References 21 publications

On Development of Methods for Expressing Customer Affective Response for Apparel Products

On Development of Methods for Expressing Customer Affective Response for Apparel Products

Optimization Solution of Laser Plane Generated from Maximum Likelihood Estimation of Projection Plane

Evaluating the capability of laser scanning to measure an automotive artefact: a comparison study of touch trigger probe and laser-scanning

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