Development of optical near-infrared spectroscopy instruments for human skin sebum measurement

Abstract

There are many techniques and instruments that are currently available to give better results for measuring the quality of human skin. In this study, two non-invasive spectroscopy instruments have been used namely NIRQuest spectrometer and ASD FieldSpec® 3 Spectroradiometer. Both of these spectroscopy instruments were used to find the correlation technique with the commercial instruments (DermaLab® USB Sebum Module). Initially an experiment was conducted to find intensities peak of the absorption of oleic acid as a part of sebum composition. From the spectra peak of the absorbance, the wavelength will be determined. Next step was to measure the reflectance of human skin sebum by using two spectroscopic instruments. The analysis will carry on at the wavelength that have been chosen from the previous study and also from the wavelength of the fatty acid to find the best wavelength that contribute in sebum composition. From several analyses, the wavelengths that contribute in sebum were 1208, 1414, 1726, and 1758 nm that obtained the value of R 2 0.8444 for NIRQuest Spectrometer and 0.8532 for ASD FieldSpec® 3 Spectroradiometer. For future research this non-invasive techniques can be used in dermatology field for the use of various skin analysis. Besides that, the less wavelength used is an advantage to develop instruments with less amount of wavelength sensor. It can reduce the cost of development.

A preliminary study of fingerprint aging using near infrared hyperspectral imaging (NIR-HSI)

“…An example is the region close to 1720 nm, which is considered especially useful for monitoring the sebaceous glands. 68,69 Generally speaking, recent samples are expected to present low intensity in this region and the intensity is expected to increase with aging. Reports in the literature present three possible explanations for the increased fatty acid concentration in the early stages of LF aging.…”