Transmission of UV/visible light through model human epidermis at varying ambient humidity

Farley, Carlton; Sadate, Sandra; Kassu, Aschalew; Sharma, Anup

doi:10.1117/12.2062154

Cited by 1 publication

(1 citation statement)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because the palmar and dorsal skin areas were the areas involved in the testing, only the stratum basale layer of the epidermis was assessed. Epidermis, considered as the outmost skin cover, has a thickness of around 0.027 to 0.15 mm [35] and made up of four to five layers [36]. When an incident lighthitsthe skin, three instances are likely to occur, that is reflection, absorption and scattering.…”

Section: Theory/calculationmentioning

confidence: 99%

Evaluation of Photodetectors for the Photoplethysmographic Signal Detection of Hand Epidermal Layer

2020

IJATCSE

View full text Add to dashboard Cite

This study presents the potential of using photoplethysmography (PPG) as an alternative to the use of expensive spectroscopy or invasive skin biopsy to analyse skin conditions, particularly of the presence or absence of melanin in both dorsal and palmar skin of human subjects. This study seeks to analyse the sensing capabilities of three photodetectors (phototransistor, light dependent resistor, photodiode) vis-à-vis varying LED colors and quantities using backscatter radiation. Further, it intends to distinguish the best detector and LED color-quantity combination for the sensing of PPG signal in both dorsal and palmar skin of human volunteers. Photoplethysmography (PPG) is considered as a facile and cost effective optical process frequently used for monitoring heart rate. A light source or emitter and a light sensor or detector make up a PPG circuit. A light emitting diode (LED) is the frequently used light source while phototransistor, photodiode or light dependent resistor are the usual light sensors or detector employed. The simulation results revealed that four pieces of yellow LED and phototransistor detector are the best combination for applications involving the melanin in dorsal and palmar skin. The results further showeddirect proportionality relationship between reflected light and age.

show abstract

Section: Theory/calculationmentioning

confidence: 99%

Evaluation of Photodetectors for the Photoplethysmographic Signal Detection of Hand Epidermal Layer

2020

IJATCSE

View full text Add to dashboard Cite

show abstract

Transmission of UV/visible light through model human epidermis at varying ambient humidity

Cited by 1 publication

References 11 publications

Evaluation of Photodetectors for the Photoplethysmographic Signal Detection of Hand Epidermal Layer

Evaluation of Photodetectors for the Photoplethysmographic Signal Detection of Hand Epidermal Layer

Contact Info

Product

Resources

About