A. Periasamy

FIBER OPTICS - APPLICATIONS

LASER BEAMS - FOCUSING

REFLECTOMETERS - LASER APPLICATIONS

SEMICONDUCTOR DIODES, PHOTODIODE - APPLICATIONS

WAVEGUIDES, OPTICAL - APPLICATONS

Biological materials

HELIUM NEON LASER

methodology

OPTIC NERVE FIBER

preliminary communication

SKIN REFLECTANCE

theoretical study

comparative study

Fiber optics

Helium

Human

Lasers

Neon

Skin

Support, Non-U.S. Gov't

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Development of an optical fibre technique for He-Ne laser screening of human body and its comparison with the integrating sphere method.

Medical & Biological Engineering & Computing

The measurement of He-Ne laser light reflectance of various internal organs in-situ, to obtain the absorption and scattering parameters, is carried out. The laser reflectometer is consisting of an optical fibre- Y guide probe. Through one arm of this the laser beam is guided to the various internal organs of the anasthetized mongrel dogs. The reflected radiations from the tissue site are collected by another arm of the probe and detected by HAD-1000A photodetector—amplifier assembly. The results show that the reflectance of the internal organs varies over a large range and is the maximum at the arch of aorta and the minimum at the spleen. The optical parameter, the scattering and absorption coefficients, calculated based on the above data show variation related to their tissue compositions. © 1997 Taylor & Francis Group, LLC.

IETE Technical Review (Institution of Electronics and Telecommunication Engineers, India)

Optical characterization of internal organs in-situ by he-ne laser light reflectometry

He/Ne laser irradiation produces various shape changes and haemolysis in erythrocytes. Under total absorption conditions, after correcting for the reflection from the surface, blood samples were exposed to various intensities of laser light. The upper limit of these intensities, at which the erythrocytes maintain their normal characteristics, has been used to develop safety levels for the various organs of subjects of varying complexions, assuming that even the cells below the skin layer are not damaged by laser exposures. Depending on the complexion these levels show considerable variations for various organs. © 1984 IFMBE.

Determination of safe exposure levels of He/Ne laser light to the human body by means of erythrocyte irradiation studies

An integrating sphere technique has been applied to assess the reflectivity of different skin sites on the body, in male subjects of various complexion and of differing form. The measured reflectance and absorbance with helium-neon laser is shown to vary with skin colour, tissue composition and the blood flow through the organs. © 1981 IFMBE.

Helium-neon laser screening of human body

Development of an optical fibre technique for He-Ne laser screening of human body and its comparison with the integrating sphere method

Journal	Medical & Biological Engineering & Computing
Publisher	Kluwer Academic Publishers
ISSN	01400118
Open Access	No