A novel processing scheme for a fibre optical low coherence laser Doppler anemometer system [for blood flow measurement]

Author

Weir, K. ; Boyle, W.J.O. ; Palmer, A.W. ; Grattan, K.T. ; Meggitt, B.T.

Author_Institution

Dept. of Electr., Electron. & Inf. Eng., City Univ., London, UK

fYear

1991

fDate

33403

Firstpage

42614

Lastpage

42617

Abstract

A system has been assembled for measuring the Doppler frequency shift of scattered light in order to determine velocity. The signal recovery scheme utilises a novel adaptation of a Michelson interferometer to give two output signals in quadrature. Simple signal processing of the output signals then allows determination of velocity rather than speed, in a system which uses simple inexpensive optical components. The system also utilises a low coherence light source. This suppresses unwanted signals and allows the measurement region to be projected ahead of the fibre probe. The instrument is currently being tested in the measurement of fluid flow velocities

Keywords

anemometers; biomedical equipment; biomedical measurement; fibre optic sensors; flow measurement; haemodynamics; laser applications in medicine; laser velocimeters; light interferometers; Doppler frequency shift; Michelson interferometer; blood flow measurement; fibre optic sensors; fibre optical low coherence; laser Doppler anemometer system; scattered light; signal processing; signal recovery scheme;

fLanguage

English

Publisher

iet

Conference_Titel

Optical Techniques and Biomedical Applications, IEE Colloquium on

Conference_Location

London

Type

conf

Filename

181796