KEYWORDS: Clouds, Confocal microscopy, Coating, Light emitting diodes, Data acquisition, Distance measurement, Solids, Data conversion, 3D acquisition, 3D image processing
Traditional measuring equipments and methods cannot satisfy the requirements of micrometer-level accuracy and realtime measurement of LED tape coating, the paper proposes a three-dimensional measurement method to compute the thickness of LED tape coating based on linear array spectral confocal. Firstly, the distance data is collected by linear array spectral confocal scanning and converted into 3D point cloud data, then the point cloud is materialized and smoothed to make the 3D object more realistic. Finally, the 3D entity is interacted in the Point Cloud Library to perform manual measurement of the tiny parts of the object. The subsequent automatic measurements are used to control the grating ruler for the specified position moving of measurement based on the previous manual measurement processes and the procedure file. The experimental results indicate that the accuracy of the proposed measurement method is less than 3um, and automatic measurement costs the processing time within 2.5s. In addition, the measurement accuracy is as high as 99.9%, which indicates that the proposed method performs a competitive result.
In the field of glass thickness measurement, the traditional contact manual measurement usually tends to destroy the measured surface, which causes slow speed and low accuracy of measurement. Combining the optical properties of the laser through the glass surface, the paper proposed a novel glass thickness measurement method based on the laser triangulation method. Double line images of the line laser reflected by the up-down surfaces of the glass will form on the CCD through the camera lens. By analyzing the texture features of laser lines in images, gray-centre algorithm is used to extracted the two-dimensional coordinates of laser lines. And three-dimensional point cloud data are derived from laser triangulation formula. The spatial interpolation in specific part of point cloud to calculate the glass thickness. The experimental results show that the proposed method has repeatability and high-precision measurement of the glass thickness.
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