Automated 360° profilometry of 3-D diffuse objects

Halioua, Maurice; Krishnamurthy, Ravi S.; Liu, Hsin-Chu; Chiang, Fu‐Pen

doi:10.1364/ao.24.002193

“…For inspection of sculptured surfaces or holes and other features on them, multiple-orientation scanning is required for full part surface coverage [9]. In this case, sensor or part tilt/rotate axis is needed in addition to the CMM linear X, Y, and Z axes.…”

Section: Motivation For This Workmentioning

confidence: 99%

Multi-sensor blue LED and touch probe inspection system

Xue¹,

Kurella²,

Spence³

2016

Computer-Aided Design and Applications

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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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“…The starting shape was obtained by an optical line-scan method [19] and can be expressed in the polar system as…”

Section: Case 3: Surface Of a Volumementioning

confidence: 99%

“…To capture the surface details of the merlion, more horizontal and vertical layers are required, which takes longer to fabricate and assemble. Due to our choice of the optical line-scan method [19], all models had an opening at the top and bottom, and the merlion model was missing a hole at the tail.…”

Section: Visual Evaluationmentioning

confidence: 99%

Embodied prototyping: exploration of a design-fabrication framework for large-scale model manufacturing

Sass

¹

,

Chen

²

,

Sung

³

2015

Computer-Aided Design and Applications

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For designers of large products such as boats, cars and houses, there have been few cost-effective machines or methods in support of one-to-one, large-scale physical prototyping. A novel physical production system is demonstrated, aiming at rapid prototyping of large-scale models. Research questions address possible ways that the system can support design prototyping as opposed to manufacturing. We present computational methods used to generate model data, principle of decomposition of a large model, and assembly of components to form 3D prototypes. The process of model making in this study revealed an extended use of human body. Our view on embodied cognition in relation to the development of the large-scale rapid prototyping system is discussed. We end with a projection of new possibilities for large-scale prototyping that engages the human body.

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“…(2) As the blue LED sensor used in this thesis is heavy (1.35 kg) compared with the carrying capacity of the gravity counterbalance spring of the CMM, the method of rotating the object was used instead of rotating the sensor. In most literature, a one-axis accurate mechanical rotary device is used to rotate the object [9], [28], [35]. It has high precision, but the cost is high and it is sensitive to room temperature change.…”

Section: Multiple-orientation Scanning and Coordinate System Registramentioning

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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Automated 360° profilometry of 3-D diffuse objects

Cited by 50 publications

References 3 publications

Multi-sensor blue LED and touch probe inspection system

Multi-sensor blue LED and touch probe inspection system

Embodied prototyping: exploration of a design-fabrication framework for large-scale model manufacturing

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

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