NDLI: Robustness analysis of imaging system for inspection of laser beam melting systems

Content Provider	IEEE Xplore Digital Library
Author	zur Jacobsmuhlen, J. Kleszczynski, S. Witt, G. Merhof, D.
Copyright Year	2014
Description	Author affiliation: Inst. for Product Eng., Univ. of Duisburg-Essen, Duisburg, Germany (Kleszczynski, S.; Witt, G.) \|\| Inst. of Imaging & Comput. Vision, RWTH Aachen Univ., Aachen, Germany (zur Jacobsmuhlen, J.; Merhof, D.)
Abstract	Laser Beam Melting (LBM) is an additive manufacturing process, which enables the layer-based production of complex parts from metal powder, i.e. “3D printing” with metal. In previous publications, we presented a high-resolution imaging system for inspection of LBM processes, which uses a high-resolution camera to acquire images of each powder layer and laser exposure result. The external camera position necessitates perspective correction, which is based on calibration markers which are “drawn” onto the powder by the LBM system's laser in the first layer. As movements of the powder deposition mechanism cause vibrations, the orientation of the camera may be changed, which would invalidate the calibration results and lead to imprecise measurements or segmentations. To evaluate the effect of these disturbances, we placed calibrations markers in multiple layers and determined the position offset using template matching. We analyze the relative marker drift in three LBM processes and determine the spatial acquisition error. The maximum distance is 4.91 pixels (156.1 μm on the part), while most detected markers deviate by less than 1.5 pixels (46 μm). Compared to the pixel size of 20 μm to 32μm, these deviations are significant and require a repeated calibration in higher layers for valid high-resolution image-based measurements.
Starting Page	1
Ending Page	4
File Size	4039859
Page Count	4
File Format	PDF
ISBN	9781479948451
DOI	10.1109/ETFA.2014.7005262
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-09-16
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Calibration Cameras Measurement by laser beam Laser beams Powders Laser stability
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

FPGA-based measurement of melt pool size in laser cladding systems

Performance improvement of a laser cladding system through FPGA-based control

Calibration of dual laser-based range cameras for reduced occlusion in 3D imaging

Robust machine vision based displacement analysis for tunnel boring machines

Flexible and low cost laser scanner for automatic tyre inspection

Dosimetric calibration of radiochromic film for laser-accelerated proton beams

Sensor system for linear defect tracking by using cone-shaped laser beam

Hand-eye calibration of hand-mounted laser range finder robot system

Beam-homogenization and space-charge-broadening calibration for accurately measuring high-intensity laser pulses using a high-speed streak camera

Robustness analysis of imaging system for inspection of laser beam melting systems

Similar Documents

FPGA-based measurement of melt pool size in laser cladding systems

Performance improvement of a laser cladding system through FPGA-based control

Calibration of dual laser-based range cameras for reduced occlusion in 3D imaging

Robust machine vision based displacement analysis for tunnel boring machines

Flexible and low cost laser scanner for automatic tyre inspection

Dosimetric calibration of radiochromic film for laser-accelerated proton beams

Sensor system for linear defect tracking by using cone-shaped laser beam

Hand-eye calibration of hand-mounted laser range finder robot system

Beam-homogenization and space-charge-broadening calibration for accurately measuring high-intensity laser pulses using a high-speed streak camera

Robustness analysis of imaging system for inspection of laser beam melting systems