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Geometric Calibration for Thermography Cameras

Schmidt, Thomas and Frommel, Christoph (2015) Geometric Calibration for Thermography Cameras. In: DGZfP-Proceedings BB 156 (156). DGZfP. 7th International Symposium on NDT in Aerospace 2015, 16.-18. Nov. 2015, Bremen. ISBN 987-3-940283-76-4.

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The application of active thermography applied as Lock-in or pulse thermography has been widely used in aerospace industry. Over the last years a number of activities had been undertaken to achieve a higher level of automation. Industrial robots are very versatile and allow a comparably easy integration of a measurement system in robotic workcell further the control unit. It is therefore possible to cover a large range of geometrical complex parts even on larger dimensions. The robot can be used for the positioning of the thermography camera and delivers the location of the robot flange coordinate system at the time of measurement automatically. In principle thermography cameras used in NDT applications as well as other fields can be handled as standard photogrammetric cameras. According to the longer wavelengths of the measured spectrum the lenses of thermography cameras are made of Germanium. Although the high cost for these lenses, they are optimized for radiometric resolution, thus geometric precision or minimal distortion are of minor interest. The approach at DLR Augsburg of a robot based measuring system for industrial thermography applications and a hand-eye-calibration procedure for a thermography end-effector has been presented in previous papers. In order to achieve higher accuracy in terms of geometric precision a number of distortion parameters have been evaluated. An automated procedure has been developed to compare different calibration strategies. Within this paper DLR-Center for Lightweight-Production-Technology in Augsburg will give insight into current work in the area of geometric calibration for thermography cameras for a high resolution camera and results derived from experiments.

Item URL in elib:https://elib.dlr.de/101534/
Document Type:Conference or Workshop Item (Speech, Other)
Title:Geometric Calibration for Thermography Cameras
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:November 2015
Journal or Publication Title:DGZfP-Proceedings BB 156
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Thermographie, Kamera, geometrische Kalibration, Thermography, Camera, geometric Calibration
Event Title:7th International Symposium on NDT in Aerospace 2015
Event Location:Bremen
Event Type:international Conference
Event Dates:16.-18. Nov. 2015
Organizer:DGZfP, FhG
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials (old)
Location: Augsburg
Institutes and Institutions:Institute of Structures and Design > Automation and Quality Assurance in Production
Deposited By: Schmidt, Thomas
Deposited On:14 Jan 2016 09:27
Last Modified:10 May 2016 23:40

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