The Spectrum of Light Emitted by LED Using a CMOS Sensor-Based Digital Camera and Its Application

Area of Science:

• Analytical Chemistry
• Spectroscopy
• Optical Physics

Background:

• Accurate spectral analysis of fluor components in liquid scintillators is crucial for various scientific applications.
• Existing methods often rely on expensive spectrophotometers, limiting accessibility.
• Understanding the blue/UV light region is particularly important for photomultiplier tube (PMT) based experiments.

Purpose of the Study:

• To introduce a novel digital photo image analysis technique for estimating fluor emission spectra.
• To investigate the relationship between hue and wavelength in the blue/UV region.
• To demonstrate a cost-effective method for spectral analysis using readily available digital cameras.

Main Methods:

• Digital photo image analysis in color space was employed.
• Complementary Metal Oxide Semiconductor (CMOS) image sensors with Bayer color filter array (CFA) technology were utilized.
• A light-emitting diode source was used to study the non-linear hue and wavelength relationship in the blue region.

Main Results:

• A close relationship between hue and wavelength was established, particularly in the blue region.
• The CMOS Bayer CFA approach successfully estimated the fluor emission spectrum without a spectrophotometer.
• The study provides novel measurements of the hue-wavelength relationship in the blue/UV spectrum.

Conclusions:

• Digital photo image analysis offers a viable and economical alternative for determining fluor emission spectra.
• The developed method is sufficient for spectral estimation in liquid scintillator samples.
• This technique enhances accessibility to spectral analysis, especially for PMT-based research.