title: Measurement of normalized spectral responsivity of digital imaging devices by using a LED-based tunable uniform source.
abstract: 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.
authors: Science of Measurement Department, University of Science and Technology, Daejeon, South Korea.
authors: Khaled
authors: K
authors: Mahmoud
authors: Seongchong
authors: S
authors: Park
authors: Seung-Nam
authors: SN
authors: Park
authors: Dong-Hoon
authors: DH
authors: Lee
mesh_terms: D002138:Calibration; D003362:Cost-Benefit Analysis; D003952:Diagnostic Imaging / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D007259:Infrared Rays; D007909:Lenses; D008027:Light; D008670:Metals / Q000737:chemistry; D010087:Oxides / Q000737:chemistry; D015203:Reproducibility of Results; D012666:Semiconductors; D012984:Software; D013997:Time Factors
chemical_list: D008670:Metals; D010087:Oxides