The Transmission of Red and Infrared Light through the Human Ear

Author

Anderson, N.M. ; Sekelj, P. ; McGregor, M.

Author_Institution

Dept. of Biophysics, Montreal Children´´s Hospital, Joint Cardio-Respiratory Service of the Royal Victoria Hospital and the Montreal Children´´s Hospital, and the Dept. of Physiology, McGill University, Montreal, Quebec, Canada

Volume

8

Issue

2

fYear

1961

fDate

4/1/1961 12:00:00 AM

Firstpage

134

Lastpage

135

Abstract

A study was performed of the light transmission characteristics of the compressed "bloodless" ear in 70 subjects of white, Indian and Negro stock. It was found that in white children and adults of both sexes, the ratio of light transmission of the red filtered photocells to that transmitted to the infrared photocell was virtually constant when the ear was rendered bloodless by compression. The error introduced by assuming this ratio to be constant was no greater than the errors involved in making the measurement. If the assumption were made that this ratio was the same in Indian and Negro subjects as it is in white subjects, the estimation of the ratio would be in error in the average Indian subject by approximately -3.38 per cent and in the average Negro subject by -4.73 per cent.

Keywords

Blood; Ear; Filters; Galvanizing; Hospitals; Humans; Lighting control; Pediatrics; Pigmentation; Senior members;

fLanguage

English

Journal_Title

Bio-Medical Electronics, IRE Transactions on

Publisher

ieee

ISSN

0096-1884

Type

jour

DOI

10.1109/TBMEL.1961.4322875

Filename

4322875