Physiological Changes of Human Skin after Sun Exposure Revealed by the Principle Components of Skin Diffuse Reflection Spectrum

After sun exposure, the concentrations of melanin and hemoglobin in human skin keep changing within 6 weeks. Measuring the diffuse reflection spectra and finding the principle components, the related physiological changes can thus be revealed. © 2019 Szu-Yu Chen, Pang-Lung Li, and Wei-Chien Hu