Accuracy Improvement for Light-Emitting-Diode-Based Colorimeter by Iterative Algorithm

Determining the spectral responsivity from relative measurements by using multicolor light-emitting diodes as probing light sources

“…[16] is more attractive than that in Ref. [15] because it is noniterative. However, the reference surface used in the reflectance measurements was restricted to an ideal white surface with constant reflectance.…”

“…1, which was previuosly used for measuring the spectral reflectance [15,16]. Since the photodetector is usually used in the configuration of normal incidence.…”

“…Another correction methods modeling the spectrum by a piecewisely polynomial function are only applicable for spectral data with slowly varying behavior [9,13,14]. Recently, two useful algorithms had been developed to remove the spectral broadening effect in the spectral reflectance measured by using multicolor LEDs as probing light sources [15,16]. These two algorithms can be applied to arbitrary responsivity functions.…”

“…A c c e p t e d M a n u s c r i p t 15 Note that there are some requirements for the reference detector. First, the reference detector must possess a wider spectral response range than the detector under test.…”