Translator Disclaimer
Paper
6 September 1999 High-definition illuminated table for optical testing
Author Affiliations +
Abstract
An illuminated table intended for illuminating transmission test charts used for the optical testing of different image capture devices has been developed. It provides a diffusely luminous table face, 300 mm in diameter, in a compact set- up. The spectral distribution of the emitted light is similar to Planck radiation of about 3050 K as required, for example, for testing, digital photographic cameras. The luminance level achievable is about 15000 cd/m2, the standard deviation of which is 1.8 percent within a circle of 300 mm in diameter. The illuminated table consists of an integrating hemisphere, with the large opening covered by an opal glass serving as the illuminated table face. Inside, a set of seven tungsten lamps is posited at locations such that the light output at the table face is as uniform as possible. Residual non-uniformities caused, for example, by slightly differing luminous intensities of the lamps are adjusted by controlling the currents of the seven lamps individually by means of a PC-controlled automatically running optimization process. This closed control loop uses a calibrated digital camera to capture the current spatial light distribution at the table face. The image is analyzed by an algorithm integrated in to the control loop.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael Schulz, Egbert Buhr, Kai Marholdt, Winfried Willemer, and Detlef Bergmann "High-definition illuminated table for optical testing", Proc. SPIE 3739, Optical Fabrication and Testing, (6 September 1999); https://doi.org/10.1117/12.360185
PROCEEDINGS
10 PAGES


SHARE
Advertisement
Advertisement
RELATED CONTENT

U. S. Navy High Resolution Small Format Camera System
Proceedings of SPIE (September 01 1975)
Optical systems for high-resolution digital still cameras
Proceedings of SPIE (August 27 1999)
Professional portrait studio for amateur digital photography
Proceedings of SPIE (January 02 1998)
Optical Frame Scan In An Image Converter Camera
Proceedings of SPIE (December 08 1986)
Light And Sound Under Water
Proceedings of SPIE (June 01 1966)
Micro Computer Expert System For High-Speed Photographic System
Proceedings of SPIE (September 01 1987)

Back to Top