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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 6 — Feb. 20, 2013
  • pp: 1263–1271

Measurement of normalized spectral responsivity of digital imaging devices by using a LED-based tunable uniform source

Khaled Mahmoud, Seongchong Park, Seung-Nam Park, and Dong-Hoon Lee  »View Author Affiliations

Applied Optics, Vol. 52, Issue 6, pp. 1263-1271 (2013)

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We present an instrumentation solution for measurement of normalized spectral responsivity of digital imaging sensors and cameras. The instrument consists of multiple light-emitting diodes (LEDs), a single-grating monochromator, and a small-size integrating sphere. Wavelength tuning is achieved by a proper selection of LED in accordance with the monochromator setting in a range from 380 to 900 nm. High spectral purity with a bandwidth of 5 nm is realized without using double gratings and order-sorting filters. Experimental characteristics and calibration of the instrument are described with the related error and uncertainty sources. The performance is demonstrated by measuring a monochrome charge-coupled device and a trichromatic complementary metal–oxide–semiconductor device. The measurement uncertainty is evaluated to be less than 1% ( k = 2 ) except several wavelengths with low LED power.

© 2013 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.3940) Instrumentation, measurement, and metrology : Metrology

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: October 31, 2012
Revised Manuscript: January 10, 2013
Manuscript Accepted: January 11, 2013
Published: February 15, 2013

Khaled Mahmoud, Seongchong Park, Seung-Nam Park, and Dong-Hoon Lee, "Measurement of normalized spectral responsivity of digital imaging devices by using a LED-based tunable uniform source," Appl. Opt. 52, 1263-1271 (2013)

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