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As a variety of light-emitting diode (LED) applications rapidly develops, accurate specifications of LED characteristics are increasingly important. In this work, we present a method for accurate measurement of LED spectra using a novel low-cost filter-array spectrum sensor. The measurement accuracy is further enhanced using particle swarm optimization. As a result, the proposed sensing method not...
Fine spectrum measurement with the application of non-negative least-square (NNLS) algorithm to low-cost filter-based Spectrum Sensor is demonstrated. Compare to conventional Moore Penrose pseudo-inverse technique, NNLS is found particularly effective for noise reduction in reconstruction of narrow-band spectra. Low cost spectrometer with an on-a-chip scale can be therefore anticipated.
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